java复制代码public E get(int index) {
    Objects.checkIndex(index, size);
    return elementData(index);
}

java复制代码public boolean add(E e) {
    modCount++;
    add(e, elementData, size);
    return true;
}

private void add(E e, Object[] elementData, int s) {
    if (s == elementData.length)
        elementData = grow();
    elementData[s] = e;
    size = s + 1;
}

java复制代码private Object[] grow(int minCapacity) {
    int oldCapacity = elementData.length;
    if (oldCapacity > 0 || elementData != DEFAULTCAPACITY_EMPTY_ELEMENTDATA) {
        int newCapacity = ArraysSupport.newLength(oldCapacity,
                minCapacity - oldCapacity, /* minimum growth */
                oldCapacity >> 1           /* preferred growth */);
        return elementData = Arrays.copyOf(elementData, newCapacity);
    } else {
        return elementData = new Object[Math.max(DEFAULT_CAPACITY, minCapacity)];
    }
}

java复制代码public void add(int index, E element) {
    rangeCheckForAdd(index);
    modCount++;
    final int s;
    Object[] elementData;
    if ((s = size) == (elementData = this.elementData).length)
        elementData = grow();
    System.arraycopy(elementData, index,
            elementData, index + 1,
            s - index);
    elementData[index] = element;
    size = s + 1;
}

java复制代码ArrayList<String> list = new ArrayList<>();
list.add("沉默王二");
list.add("沉默王三");
list.add("沉默王四");
list.add("沉默王五");
list.add("沉默王六");
list.add("沉默王七");
list.add(2, "沉默王八");

java复制代码public E remove(int index) {
    Objects.checkIndex(index, size);
    final Object[] es = elementData;

    @SuppressWarnings("unchecked") E oldValue = (E) es[index];
    fastRemove(es, index);

    return oldValue;
}
private void fastRemove(Object[] es, int i) {
    modCount++;
    final int newSize;
    if ((newSize = size - 1) > i)
        System.arraycopy(es, i + 1, es, i, newSize - i);
    es[size = newSize] = null;
}

java复制代码public E get(int index) {
    checkElementIndex(index);
    return node(index).item;
}

LinkedList.Node<E> node(int index) {
    // assert isElementIndex(index);

    if (index < (size >> 1)) {
        LinkedList.Node<E> x = first;
        for (int i = 0; i < index; i++)
            x = x.next;
        return x;
    } else {
        LinkedList.Node<E> x = last;
        for (int i = size - 1; i > index; i--)
            x = x.prev;
        return x;
    }
}

java复制代码public E getFirst() {
    final LinkedList.Node<E> f = first;
    if (f == null)
        throw new NoSuchElementException();
    return f.item;
}

public E getLast() {
    final LinkedList.Node<E> l = last;
    if (l == null)
        throw new NoSuchElementException();
    return l.item;
}

java复制代码public boolean add(E e) {
    linkLast(e);
    return true;
}
void linkLast(E e) {
    final LinkedList.Node<E> l = last;
    final LinkedList.Node<E> newNode = new LinkedList.Node<>(l, e, null);
    last = newNode;
    if (l == null)
        first = newNode;
    else
        l.next = newNode;
    size++;
    modCount++;
}

java复制代码public void add(int index, E element) {
    checkPositionIndex(index);

    if (index == size)
        linkLast(element);
    else
        linkBefore(element, node(index));
}

java复制代码public void addFirst(E e) {
    linkFirst(e);
}
private void linkFirst(E e) {
    final LinkedList.Node<E> f = first;
    final LinkedList.Node<E> newNode = new LinkedList.Node<>(null, e, f);
    first = newNode;
    if (f == null)
        last = newNode;
    else
        f.prev = newNode;
    size++;
    modCount++;
}

java复制代码public void addLast(E e) {
    linkLast(e);
}

void linkLast(E e) {
    final LinkedList.Node<E> l = last;
    final LinkedList.Node<E> newNode = new LinkedList.Node<>(l, e, null);
    last = newNode;
    if (l == null)
        first = newNode;
    else
        l.next = newNode;
    size++;
    modCount++;
}

java复制代码void linkBefore(E e, LinkedList.Node<E> succ) {
    // assert succ != null;
    final LinkedList.Node<E> pred = succ.prev;
    final LinkedList.Node<E> newNode = new LinkedList.Node<>(pred, e, succ);
    succ.prev = newNode;
    if (pred == null)
        first = newNode;
    else
        pred.next = newNode;
    size++;
    modCount++;
}

java复制代码public E remove(int index) {
    checkElementIndex(index);
    return unlink(node(index));
}

E unlink(LinkedList.Node<E> x) {
    // assert x != null;
    final E element = x.item;
    final LinkedList.Node<E> next = x.next;
    final LinkedList.Node<E> prev = x.prev;

    if (prev == null) {
        first = next;
    } else {
        prev.next = next;
        x.prev = null;
    }

    if (next == null) {
        last = prev;
    } else {
        next.prev = prev;
        x.next = null;
    }

    x.item = null;
    size--;
    modCount++;
    return element;
}

shell复制代码 java -jar ResumeManager-1.0.0.jar

shell复制代码nohup java -jar ResumeManager-1.0.0.jar

sql复制代码mysql> select * from performance_schema.persisted_variables;
Empty set (0.00 sec)

mysql> show variables like '%max_connections%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| max_connections        | 151   |
| mysqlx_max_connections | 100   |
+------------------------+-------+
2 rows in set (0.00 sec)

mysql> set persist max_connections=300;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from performance_schema.persisted_variables;
+-----------------+----------------+
| VARIABLE_NAME   | VARIABLE_VALUE |
+-----------------+----------------+
| max_connections | 300            |
+-----------------+----------------+
1 row in set (0.00 sec)

json复制代码{
    "Version": 1, 
    "mysql_server": {
        "max_connections": {
            "Value": "300", 
            "Metadata": {
                "Timestamp": 1632575065787609, 
                "User": "root", 
                "Host": "localhost"
            }
        }
    }
}

sql复制代码mysql> set persist max_connections=DEFAULT;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from performance_schema.persisted_variables;
+-----------------+----------------+
| VARIABLE_NAME   | VARIABLE_VALUE |
+-----------------+----------------+
| max_connections | 151            |
+-----------------+----------------+
1 row in set (0.00 sec)

sql复制代码mysql> RESET PERSIST;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from performance_schema.persisted_variables;
Empty set (0.00 sec)

arduino复制代码接口函数大多定义在sql/persisted_variable.cc文件中：
启动时载入mysqld-auto.cnf的内容: Persisted_variables_cache::load_persist_file()； 通过json解析合法性，并存入内存
将文件中读取的配置进行设置： Persisted_variables_cache::set_persist_options
 
运行SET PERSIST命令时，调用Persisted_variables_cache::set_variable 更新内存中存储的值
写入mysqld-auto.cnf文件中： Persisted_variables_cache::flush_to_file

java复制代码public class Main {



    public List<List<Integer>> levelOrder(TreeNode root) {

        List<List<Integer>> res = new ArrayList<>();
        if(root == null)
            return res;

        Deque<TreeNode> queue = new LinkedList<>();
        queue.add(root);

        while(!queue.isEmpty()) {
            int size = queue.size();
            List<Integer> list = new ArrayList<>();
            while (size-- > 0) {
                TreeNode node = queue.poll();
                list.add(node.val);
                if (node.left != null) {
                    queue.add(node.left);
                }
                if (node.right != null) {
                    queue.add(node.right);
                }
            }
            res.add(list);
        }

        return res;
    }

}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码
public class Main {


    List<Integer> res;
    public List<Integer> preorderTraversal(TreeNode root) {
        res = new ArrayList<>();
        if(root == null)
            return res;
        preTreeNode(root);
        return res;
    }

    private void preTreeNode(TreeNode root) {
        if(root == null) return;

        res.add(root.val);

        preTreeNode(root.left);
        preTreeNode(root.right);
    }

}

class TreeNode {
      int val;
      TreeNode left;
      TreeNode right;
      TreeNode() {}
      TreeNode(int val) { this.val = val; }
      TreeNode(int val, TreeNode left, TreeNode right) {
          this.val = val;
          this.left = left;
          this.right = right;
      }
}

java复制代码public class Main {


    List<Integer> res;

    public List<Integer> inorderTraversal(TreeNode root) {
        res = new ArrayList<>();
        if (root == null)
            return res;

        midTreeNode(root);
        return res;
    }

    private void midTreeNode(TreeNode root) {
        if (root == null) return;

        midTreeNode(root.left);

        res.add(root.val);

        midTreeNode(root.right);
    }

}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码public class Main {
    

    List<Integer> res;
    public List<Integer> postorderTraversal(TreeNode root) {
        res = new ArrayList<>();
        if(root == null)
            return res;

        postTreeNode(root);
        return res;
    }

    private void postTreeNode(TreeNode root) {
        if(root == null) return;

        postTreeNode(root.left);
        postTreeNode(root.right);

        res.add(root.val);
    }

}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码
public class Main {

    public List<Integer> preorderTraversal(TreeNode root) {
        List<Integer> res = new ArrayList<>();
        if (root == null) {
            return res;
        }
        Deque<TreeNode> stack = new LinkedList<>();
        stack.push(root);
        while (!stack.isEmpty()) {
            TreeNode node = stack.pop();
            res.add(node.val);
            if (node.right != null) {
                stack.push(node.right);
            }
            if (node.left != null) {
                stack.push(node.left);
            }
        }
        return res;
    }

}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码
public class Main {


    public List<Integer> inorderTraversal(TreeNode root) {
        List<Integer> res = new ArrayList<>();
        if (root == null) {
            return res;
        }
        Deque<TreeNode> stack = new LinkedList<>();
        TreeNode cur = root;
        while (!stack.isEmpty() || cur != null) {
            while(cur != null) {
                stack.push(cur);
                cur = cur.left;
            }
            TreeNode node = stack.pop();
            res.add(node.val);
            if(node.right != null) {
                cur = node.right;
            }
        }
        return res;
    }

}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码public class Main {


    public List<Integer> postorderTraversal(TreeNode root) {
        List<Integer> result = new ArrayList<Integer>();
        if (root == null)
            return result;
        Deque<TreeNode> stack = new LinkedList<>();
        stack.push(root);   
        while (!stack.isEmpty()) {
            TreeNode node = stack.pop(); 
            if (node.left != null)
                stack.push(node.left);  
            if (node.right != null) {
                stack.push(node.right); 
            }
            result.add(0, node.val); 
        }
        return result;

    }
}

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;

    TreeNode() {
    }

    TreeNode(int val) {
        this.val = val;
    }

    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}

java复制代码@Autowired(required = false)
private Instrument instrument;

java复制代码@Autowired
@Qualifire("guitar")
private Instrument instrument;

xml复制代码<bean class = "com.springinaction.beanxml.Guitar">
<qualifier value = "stringed"></qualifier>
</bean>

java复制代码@Qualifier("Stringed")
public class Guitar implements Instrument{
    
}

golang复制代码package gitlab

import (
    "context"
    "crypto/tls"
    "encoding/json"
    "io/ioutil"
    "net/http"
    "time"

    "github.com/mitchellh/mapstructure"
    "golang.org/x/oauth2"

    "kubesphere.io/kubesphere/pkg/apiserver/authentication/identityprovider"
    "kubesphere.io/kubesphere/pkg/apiserver/authentication/oauth"
)

// 初始化过程中，注册oauth Provider
func init() {
    identityprovider.RegisterOAuthProvider(&gitlabProviderFactory{})
}

type gitlab struct {
    // ClientID is the application's ID.
    ClientID string `json:"clientID" yaml:"clientID"`

    // ClientSecret is the application's secret.
    ClientSecret string `json:"-" yaml:"clientSecret"`

    // Endpoint contains the resource server's token endpoint
    // URLs. These are constants specific to each server and are
    // often available via site-specific packages, such as
    // google.Endpoint or gitlab.endpoint.
    Endpoint endpoint `json:"endpoint" yaml:"endpoint"`

    // RedirectURL is the URL to redirect users going through
    // the OAuth flow, after the resource owner's URLs.
    RedirectURL string `json:"redirectURL" yaml:"redirectURL"`

    // Used to turn off TLS certificate checks
    InsecureSkipVerify bool `json:"insecureSkipVerify" yaml:"insecureSkipVerify"`

    // Scope specifies optional requested permissions.
    Scopes []string `json:"scopes" yaml:"scopes"`

    Config *oauth2.Config `json:"-" yaml:"-"`
}

// endpoint represents an OAuth 2.0 provider's authorization and token
// endpoint URLs.
type endpoint struct {
    AuthURL     string `json:"authURL" yaml:"authURL"`
    TokenURL    string `json:"tokenURL" yaml:"tokenURL"`
    UserInfoURL string `json:"userInfoURL" yaml:"userInfoURL"`
}

type Identity struct {
    Provider string `json:"provider"`
    ExternUid string `json:"extern_uid"`
}

// 根据gitab user api接口返回字段定义结构体
type gitlabIdentity struct {
    ID                int       `json:"id"`
    UserName          string    `json:"username"`
    Email             string    `json:"email"`
    Name              string    `json:"name"`
    State             string     `json:"state"`
    AvatarURL         string    `json:"avatar_url"`
    WEBURL            string    `json:"web_url"`
    CreatedAt         time.Time `json:"created_at"`
    IsAdmin           bool      `json:"is_admin"`
    Bio               string    `json:"bio"` 
    Location          string    `json:"location"` 
    Skype             string    `json:"skype"` 
    LINKEDIN          string    `json:"linkedin"`
    TWITTER           string    `json:"twitter"`
    WebsiteURL        string    `json:"website_url"`
    ORGANIZATION      string    `json:"organization"`
    LastSignInAt      time.Time `json:"last_sign_in_at"`
    ConfirmedAt       time.Time `json:"confirmed_at"`
    ThemeID           int       `json:"theme_id"`
    ColorSchemeID     int       `json:"color_scheme_id"`
    ProjectsLimits    int       `json:"projects_limit"`
    CurrentSignInAt   time.Time `json:"current_sign_in_at"`
    CanCreateGroup    bool      `json:"can_create_group"`
    CanCreateProject  bool      `json:"can_create_project"`
    TwoFactorEnabled  bool      `json:"two_factor_enabled"`
    External          bool      `json:"external"`
    Identities        []Identity `json:"identities"`
}

type gitlabProviderFactory struct {
}

func (g *gitlabProviderFactory) Type() string {
    return "GitLabIdentityProvider"
}

func (g *gitlabProviderFactory) Create(options oauth.DynamicOptions) (identityprovider.OAuthProvider, error) {
    var gitlab gitlab
    if err := mapstructure.Decode(options, &gitlab); err != nil {
        return nil, err
    }

    // fixed options
    options["endpoint"] = oauth.DynamicOptions{
        "authURL":     gitlab.Endpoint.AuthURL,
        "tokenURL":    gitlab.Endpoint.TokenURL,
        "userInfoURL": gitlab.Endpoint.UserInfoURL,
    }
    gitlab.Config = &oauth2.Config{
        ClientID:     gitlab.ClientID,
        ClientSecret: gitlab.ClientSecret,
        Endpoint: oauth2.Endpoint{
            AuthURL:  gitlab.Endpoint.AuthURL,
            TokenURL: gitlab.Endpoint.TokenURL,
        },
        RedirectURL: gitlab.RedirectURL,
        Scopes:      gitlab.Scopes,
    }
    return &gitlab, nil
}

func (g gitlabIdentity) GetUserID() string {
    return g.UserName
}

func (g gitlabIdentity) GetUsername() string {
    return g.UserName
}

func (g gitlabIdentity) GetEmail() string {
    return g.Email
}

// 请求oauth2服务端,反序列化用户信息
func (g *gitlab) IdentityExchange(code string) (identityprovider.Identity, error) {
    ctx := context.TODO()
    if g.InsecureSkipVerify {
        client := &http.Client{
            Transport: &http.Transport{
                TLSClientConfig: &tls.Config{
                    InsecureSkipVerify: true,
                },
            },
        }
        ctx = context.WithValue(ctx, oauth2.HTTPClient, client)
    }
    token, err := g.Config.Exchange(ctx, code)
    if err != nil {
        return nil, err
    }
    resp, err := oauth2.NewClient(ctx, oauth2.StaticTokenSource(token)).Get(g.Endpoint.UserInfoURL)
    if err != nil {
        return nil, err
    }

    data, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    var gitlabIdentity gitlabIdentity
    err = json.Unmarshal(data, &gitlabIdentity)
    if err != nil {
        return nil, err
    }

    return gitlabIdentity, nil
}

golang复制代码    kubesphere.yaml: |
    authentication:
      authenticateRateLimiterMaxTries: 10
      authenticateRateLimiterDuration: 10m0s
      jwtSecret: "xxxxxxxxxxxxxxxxx"
      oauthOptions:
        accessTokenMaxAge: 1h
        accessTokenInactivityTimeout: 30m
        identityProviders:
        - name: gitlab
          type: GitLabIdentityProvider
          mappingMethod: auto
          provider:
            clientID: 'xxxxxxxxxxxxxxxx'
            clientSecret: 'xxxxxxxxxxxx'
            endpoint:
              # xxx gitlab地址
              authURL: 'http://xxx/oauth/authorize'
              tokenURL: 'http://xxx/oauth/token'
              userInfoURL: 'http://xxx/api/v4/user'
            redirectURL: 'http://xxx/oauth/redirect/gitlab'
            scopes:
              - read_user

ini复制代码java -Dserver.port=8080 -Dcsp.sentinel.dashboard.server=localhost:8080 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard-1.7.1.jar

ini复制代码java -Dsentinel.dashboard.auth.username=admin -Dsentinel.dashboard.auth.password=123 -jar sentinel-dashboard-1.7.1.jar

yaml复制代码server:
  port: 9008
spring:
  application:
    ## 指定服务名称，在nacos中的名字
    name: sentinel-service
  cloud:
    nacos:
      discovery:
        # nacos的服务地址，nacos-server中IP地址:端口号
        server-addr: 127.0.0.1:8848
management:
  endpoints:
    web:
      exposure:
        ## yml文件中存在特殊字符，必须用单引号包含，否则启动报错
        include: '*'

xml复制代码<!--sentinel的依赖-->
<dependency>
	<groupId>com.alibaba.cloud</groupId>
	<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

yaml复制代码spring:
  cloud:
    sentinel:
      transport:
      	## 指定控制台的地址，默认端口8080
        dashboard: localhost:8080

less复制代码@RestController
@RequestMapping("/sentinel")
public class FlowLimitController {

    @GetMapping("/test")
    public String test(){
        return "接收到一条消息--------";
    }
}

yaml复制代码spring:
    sentinel:
      # 取消控制台懒加载，项目启动即连接Sentinel
      eager: true

kotlin复制代码@RestController
@RequestMapping("/sentinel")
public class FlowLimitController {

    /**
     * 下单接口
     * @return
     */
    @GetMapping("/order")
    public String order()  {
        return "下单成功..........";
    }

    /**
     * 支付接口
     * @return
     */
    @GetMapping("/pay")
    public String pay()  {
        return "支付成功..........";
    }
}

less复制代码@RestController
@RequestMapping("/sentinel/provider")
@Slf4j
public class FlowLimitController {

    @GetMapping("/test")
    public String test() throws InterruptedException {
        //休眠3秒钟
        Thread.sleep(3000);
        log.info("收到一条消息----test");
        return "接收到一条消息--------";
    }
}

less复制代码@Service
@Slf4j
public class FlowServiceImpl implements FlowService {

    /**
     * @SentinelResource的value属性指定了资源名，一定要唯一
     * blockHandler属性指定了兜底方法
     */
    @Override
    @SentinelResource(value = "OrderQuery",blockHandler = "handlerQuery")
    public String query(String p1, String p2) {
        log.info("查询商品，p1：{}，p2：{}",p1,p2);
        return "查询商品：success";
    }

    /**
     * 对应得兜底方法，一旦被限流将会调用这个方法来处理
     */
    public String handlerQuery(@RequestParam(value = "p1",required = false) String p1,
                               @RequestParam(value = "p2",required = false)String p2,
                               BlockException exception){
        log.info("查询商品，p1：{}，p2：{}",p1,p2);
        return "查询商品：熔断了......";
    }
}

less复制代码@RestController
@RequestMapping("/sentinel/provider")
@Slf4j
public class FlowLimitController {
    @Autowired
    private FlowService flowService;

    @GetMapping("/order/query")
    public String query(@RequestParam(value = "p1",required = false) String p1, @RequestParam(value = "p2",required = false)String p2){
        return flowService.query(p1,p2);
    }

}

xml复制代码<dependency>
      <groupId>com.alibaba.csp</groupId>
      <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>

yaml复制代码spring:
  cloud:
    sentinel:
      ## nacos持久化配置
      datasource:
        ## 配置流控规则，名字任意
        ds-flow:
          nacos:
            ## nacos的地址
            server-addr: 127.0.0.1:8848
            ## 配置ID
            dataId: ${spring.application.name}-flow
            ## 配置分组，默认是DEFAULT_GROUP
            groupId: DEFAULT_GROUP
            ## 配置存储的格式
            data-type: json
            ## rule-type设置对应得规则类型，总共七大类型，在com.alibaba.cloud.sentinel.datasource.RuleType这个枚举类中有体现
            rule-type: flow
        ## 配置降级规则，名字任意
        ds-degrade:
          nacos:
            ## nacos的地址
            server-addr: 127.0.0.1:8848
            ## 配置ID
            dataId: ${spring.application.name}-degrade
            ## 配置分组，默认是DEFAULT_GROUP
            groupId: DEFAULT_GROUP
            ## 配置存储的格式
            data-type: json
            ## rule-type设置对应得规则类型，总共七大类型，在com.alibaba.cloud.sentinel.datasource.RuleType这个枚举类中有体现
            rule-type: degrade

ruby复制代码[
  {
    // 资源名
    "resource": "/test",
    // 针对来源，若为 default 则不区分调用来源
    "limitApp": "default",
    // 限流阈值类型(1:QPS;0:并发线程数）
    "grade": 1,
    // 阈值
    "count": 1,
    // 是否是集群模式
    "clusterMode": false,
    // 流控效果(0:快速失败;1:Warm Up(预热模式);2:排队等待)
    "controlBehavior": 0,
    // 流控模式(0:直接；1:关联;2:链路)
    "strategy": 0,
    // 预热时间（秒，预热模式需要此参数）
    "warmUpPeriodSec": 10,
    // 超时时间（排队等待模式需要此参数）
    "maxQueueingTimeMs": 500,
    // 关联资源、入口资源(关联、链路模式)
    "refResource": "rrr"
  }
]

json复制代码[
  {
  	// 资源名
    "resource": "/test1",
    "limitApp": "default",
    // 熔断策略（0:慢调用比例，1:异常比率，2:异常计数）
    "grade": 0,
    // 最大RT、比例阈值、异常数
    "count": 200,
    // 慢调用比例阈值，仅慢调用比例模式有效（1.8.0 引入）
    "slowRatioThreshold": 0.2,
    // 最小请求数
    "minRequestAmount": 5,
    // 当单位统计时长(类中默认1000)
    "statIntervalMs": 1000,
    // 熔断时长
    "timeWindow": 10
  }
]

ruby复制代码[
  {
  	// 资源名
    "resource": "/test1",
    // 限流模式（QPS 模式，不可更改）
    "grade": 1,
    // 参数索引
    "paramIdx": 0,
    // 单机阈值
    "count": 13,
    // 统计窗口时长
    "durationInSec": 6,
    // 是否集群 默认false
    "clusterMode": 默认false,
    // 
    "burstCount": 0,
    // 集群模式配置
    "clusterConfig": {
      // 
      "fallbackToLocalWhenFail": true,
   	  // 
      "flowId": 2,
      // 
      "sampleCount": 10,
      // 
      "thresholdType": 0,
      // 
      "windowIntervalMs": 1000
    },
    // 流控效果（支持快速失败和匀速排队模式）
    "controlBehavior": 0,
    // 
    "limitApp": "default",
    // 
    "maxQueueingTimeMs": 0,
    // 高级选项
    "paramFlowItemList": [
      {
      	// 参数类型
        "classType": "int",
      	// 限流阈值
        "count": 222,
      	// 参数值
        "object": "2"
      }
    ]
  }
]

json复制代码[
  {
  	// RT
    "avgRt": 1,
    // CPU 使用率
    "highestCpuUsage": -1,
    // LOAD
    "highestSystemLoad": -1,
    // 线程数
    "maxThread": -1,
    // 入口 QPS
    "qps": -1
  }
]

json复制代码[
  {
    // 资源名
    "resource": "sentinel_spring_web_context",
  	// 流控应用
    "limitApp": "/test",
    // 授权类型(0代表白名单；1代表黑名单。)
    "strategy": 0
  }
]

xml复制代码<!-- for Nacos rule publisher sample -->
<dependency>
       <groupId>com.alibaba.csp</groupId>
       <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>

less复制代码@Autowired
//使用nacos的依赖
@Qualifier("flowRuleNacosProvider")
private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
@Autowired
//使用nacos的依赖
@Qualifier("flowRuleNacosPublisher")
private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

ini复制代码mvn clean install -DskipTests=true -pl sentinel-dashboard -am

复制代码Username,password
Admin,123
Tom,123
Jack,123

ini复制代码# 请找remote_hosts配置
remote_hosts=127.0.0.1,192.168.6.166:1099

ini复制代码# 寻找server_port参数去掉注释
server_port=1099
# 寻找server.rmi.localport参数去掉注释,修改端口与上面一致
server.rmi.localport=1099
# 寻找server.rmi.ssi.disable=true去掉注释
server.rmi.ssi.disable=true

diff复制代码Jmeter  -h  查看所有的命令
-n 非 GUI 模式 -> 在非 GUI 模式下运行 JMeter
-t 测试文件 -> 要运行的 JMeter 测试脚本文件-l 
日志文件 -> 记录结果的文件
-r 远程执行 -> 在Jmter.properties文件中指定的所有远程服务器
-H 代理主机 -> 设置 JMeter 使用的代理主机
-P 代理端口 -> 设置 JMeter 使用的代理主机的端口号
例如：jmeter -n -t test1.jmx -l logfile1.jtl -H 192.168.1.1 -P 8080
运行命令格式：
jmeter -n -t [jmx脚本路径] -l [测试输出文件路径]
参数解释：
-n: 表示 non gui mode,就是非图形化模式
-t: 表示jmeter脚本的路
-l:表示输出结果路径，如果没有该文件就自动创建，可以生成csv或者jtl文

java复制代码org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\
org.springframework.boot.autoconfigure.condition.OnBeanCondition,\
org.springframework.boot.autoconfigure.condition.OnClassCondition,\
org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition

java复制代码public static <T> List<T> loadFactories(Class<T> factoryType, @Nullable ClassLoader classLoader) {
    Assert.notNull(factoryType, "'factoryType' must not be null");
    ClassLoader classLoaderToUse = classLoader;
    if (classLoader == null) {
        classLoaderToUse = SpringFactoriesLoader.class.getClassLoader();
    }
    // 调用loadFactoryNames获取接口的实现类
    List<String> factoryImplementationNames = loadFactoryNames(factoryType, classLoaderToUse);
    if (logger.isTraceEnabled()) {
        logger.trace("Loaded [" + factoryType.getName() + "] names: " + factoryImplementationNames);
    }
    // 遍历 factoryNames 数组，创建实现类的对象
    List<T> result = new ArrayList(factoryImplementationNames.size());
    Iterator var5 = factoryImplementationNames.iterator();
    //排序
    while(var5.hasNext()) {
        String factoryImplementationName = (String)var5.next();
        result.add(instantiateFactory(factoryImplementationName, factoryType, classLoaderToUse));
    }

    AnnotationAwareOrderComparator.sort(result);
    return result;
}

java复制代码public static List<String> loadFactoryNames(Class<?> factoryType, @Nullable ClassLoader classLoader) {
    ClassLoader classLoaderToUse = classLoader;
    if (classLoader == null) {
        classLoaderToUse = SpringFactoriesLoader.class.getClassLoader();
    }

    String factoryTypeName = factoryType.getName();
    //获取自动配置类
    return (List)loadSpringFactories(classLoaderToUse).getOrDefault(factoryTypeName, Collections.emptyList());
}

java复制代码private static Map<String, List<String>> loadSpringFactories(ClassLoader classLoader) {
    Map<String, List<String>> result = (Map)cache.get(classLoader);
    if (result != null) {
        return result;
    } else {
        HashMap result = new HashMap();

    try {
        //扫描所有 Jar 包类路径下的 META-INF/spring.factories 文件
        Enumeration urls = classLoader.getResources("META-INF/spring.factories");

        while(urls.hasMoreElements()) {
                URL url = (URL)urls.nextElement();
                UrlResource resource = new UrlResource(url);
                //将扫描到的 META-INF/spring.factories 文件中内容包装成 properties 对象
                Properties properties = PropertiesLoaderUtils.loadProperties(resource);
                Iterator var6 = properties.entrySet().iterator();

                while(var6.hasNext()) {
                    Map.Entry<?, ?> entry = (Map.Entry)var6.next();
                    //提取 properties 对象中的 key 值
                    String factoryTypeName = ((String)entry.getKey()).trim();
                    //提取 proper 对象中的 value 值（多个类的完全限定名使用逗号连接的字符串）
                    // 使用逗号为分隔符转换为数组，数组内每个元素都是配置类的完全限定名
                    String[] factoryImplementationNames = StringUtils.commaDelimitedListToStringArray((String)entry.getValue());
                    String[] var10 = factoryImplementationNames;
                    int var11 = factoryImplementationNames.length;
                    //遍历配置类数组，并将数组转换为 list 集合
                    for(int var12 = 0; var12 < var11; ++var12) {
                        String factoryImplementationName = var10[var12];
                        ((List)result.computeIfAbsent(factoryTypeName, (key) -> {
                            return new ArrayList();
                        })).add(factoryImplementationName.trim());
                    }
                }
            }
            //将 propertise 对象的 key 与由配置类组成的 List 集合一一对应存入名为 result 的 Map 中
            result.replaceAll((factoryType, implementations) -> {
                return (List)implementations.stream().distinct().collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
            });
            cache.put(classLoader, result);
            //返回 result
            return result;
        } catch (IOException var14) {
            throw new IllegalArgumentException("Unable to load factories from location [META-INF/spring.factories]", var14);
        }
     }
}

java复制代码# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\
org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\
org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\
org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\
org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\
org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\
org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\
org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRestClientAutoConfiguration,\
org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.r2dbc.R2dbcDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.r2dbc.R2dbcRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\
org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration,\
org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\
org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\
org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\
org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\
org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\
org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\
org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\
org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\
org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\
org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\
org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\
org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\
org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\
org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\
org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\
org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\
org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\
org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration,\
org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\
org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\
org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\
org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\
org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\
org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration,\
org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\
org.springframework.boot.autoconfigure.r2dbc.R2dbcTransactionManagerAutoConfiguration,\
org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration,\
org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration,\
org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration,\
org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\
org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\
org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration,\
org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\
org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\
org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\
org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\
org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\
org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\
org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\
org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration

java复制代码    public Class<? extends Group> getImportGroup() {
        //获取实现了 DeferredImportSelector.Gorup 接口的 AutoConfigurationImportSelector.AutoConfigurationGroup 类
        return AutoConfigurationImportSelector.AutoConfigurationGroup.class;
    }

java复制代码public void process(AnnotationMetadata annotationMetadata, DeferredImportSelector deferredImportSelector) {
    Assert.state(deferredImportSelector instanceof AutoConfigurationImportSelector, () -> {
        return String.format("Only %s implementations are supported, got %s", AutoConfigurationImportSelector.class.getSimpleName(), deferredImportSelector.getClass().getName());
    });
    //拿到 META-INF/spring.factories中的EnableAutoConfiguration，并做排除、过滤处理
    //AutoConfigurationEntry里有需要引入配置类和排除掉的配置类，最终只要返回需要配置的配置类
    AutoConfigurationImportSelector.AutoConfigurationEntry autoConfigurationEntry = ((AutoConfigurationImportSelector)deferredImportSelector).getAutoConfigurationEntry(annotationMetadata);
    //加入缓存,List<AutoConfigurationEntry>类型
    this.autoConfigurationEntries.add(autoConfigurationEntry);
    Iterator var4 = autoConfigurationEntry.getConfigurations().iterator();

    while(var4.hasNext()) {
        String importClassName = (String)var4.next();
        //加入缓存，Map<String, AnnotationMetadata>类型
        this.entries.putIfAbsent(importClassName, annotationMetadata);
    }
}

java复制代码protected AutoConfigurationImportSelector.AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {
    if (!this.isEnabled(annotationMetadata)) {
        return EMPTY_ENTRY;
    } else {
        //获取注解元数据中的属性设置
        AnnotationAttributes attributes = this.getAttributes(annotationMetadata);
        //获取自动配置类
        List<String> configurations = this.getCandidateConfigurations(annotationMetadata, attributes);
        //删除list 集合中重复的配置类
        configurations = this.removeDuplicates(configurations);
        //获取飘出导入的配置类
        Set<String> exclusions = this.getExclusions(annotationMetadata, attributes);
        //检查是否还存在排除配置类
        this.checkExcludedClasses(configurations, exclusions);
        //删除排除的配置类
        configurations.removeAll(exclusions);
        //获取过滤器，过滤配置类
        configurations = this.getConfigurationClassFilter().filter(configurations);
        //出发自动化配置导入事件
        this.fireAutoConfigurationImportEvents(configurations, exclusions);
        return new AutoConfigurationImportSelector.AutoConfigurationEntry(configurations, exclusions);
    }
}

java复制代码public Iterable<DeferredImportSelector.Group.Entry> selectImports() {
    if (this.autoConfigurationEntries.isEmpty()) {
        return Collections.emptyList();
    } else {
        //获取所有需要排除的配置类
        Set<String> allExclusions = (Set)this.autoConfigurationEntries.stream().
                map(AutoConfigurationImportSelector.AutoConfigurationEntry::getExclusions).flatMap(Collection::stream).collect(Collectors.toSet());
        //获取所有经过自动化配置过滤器的配置类
        Set<String> processedConfigurations = (Set)this.autoConfigurationEntries.stream().map(AutoConfigurationImportSelector.
                AutoConfigurationEntry::getConfigurations).flatMap(Collection::stream).collect(Collectors.toCollection(LinkedHashSet::new));
        //排除过滤后配置类中需要排除的类
        processedConfigurations.removeAll(allExclusions);
        return (Iterable)this.sortAutoConfigurations(processedConfigurations,
                this.getAutoConfigurationMetadata()).stream().map((importClassName) -> {
            return new DeferredImportSelector.Group.Entry((AnnotationMetadata)this.entries.get(importClassName), importClassName);
        }).collect(Collectors.toList());
    }
}

java复制代码@Configuration(   //表示这是一个配置类，与 xml 配置文件等价，也可以给容器中添加组件

        proxyBeanMethods = false
)
@AutoConfigureOrder(-2147483648)
@ConditionalOnClass({ServletRequest.class})//判断当前项目有没有 ServletRequest 这个类
@ConditionalOnWebApplication(// 判断当前应用是否是 web 应用，如果是，当前配置类生效 
type = Type.SERVLET
)
@EnableConfigurationProperties({ServerProperties.class})
//启动指定类的属性配置（ConfigurationProperties）功能；将配置文件中对应的值和 ServerProperties 绑定起来；并把 ServerProperties 加入到ioc容器中
@Import({ServletWebServerFactoryAutoConfiguration.BeanPostProcessorsRegistrar.class, EmbeddedTomcat.class, EmbeddedJetty.class, EmbeddedUndertow.class})
public class ServletWebServerFactoryAutoConfiguration {
    public ServletWebServerFactoryAutoConfiguration() {
    }

    @Bean //给容器中添加一个组件，这个组件的某些值需要从properties中获取
    public ServletWebServerFactoryCustomizer servletWebServerFactoryCustomizer(ServerProperties serverProperties, ObjectProvider<WebListenerRegistrar> webListenerRegistrars) {
        return new ServletWebServerFactoryCustomizer(serverProperties, (List) webListenerRegistrars.orderedStream().collect(Collectors.toList()));
    }

    @Bean
    @ConditionalOnClass(
            name = {"org.apache.catalina.startup.Tomcat"}
    )
    public TomcatServletWebServerFactoryCustomizer tomcatServletWebServerFactoryCustomizer(ServerProperties serverProperties) {
        return new TomcatServletWebServerFactoryCustomizer(serverProperties);
    }

    @Bean
    @ConditionalOnMissingFilterBean({ForwardedHeaderFilter.class})
    @ConditionalOnProperty(
            value = {"server.forward-headers-strategy"},
            havingValue = "framework"
    )
    public FilterRegistrationBean<ForwardedHeaderFilter> forwardedHeaderFilter() {
        ForwardedHeaderFilter filter = new ForwardedHeaderFilter();
        FilterRegistrationBean<ForwardedHeaderFilter> registration = new FilterRegistrationBean(filter, new ServletRegistrationBean[0]);
        registration.setDispatcherTypes(DispatcherType.REQUEST, new DispatcherType[]{DispatcherType.ASYNC, DispatcherType.ERROR});
        registration.setOrder(-2147483648);
        return registration;
    }

    public static class BeanPostProcessorsRegistrar implements ImportBeanDefinitionRegistrar, BeanFactoryAware {
        private ConfigurableListableBeanFactory beanFactory;

        public BeanPostProcessorsRegistrar() {
        }

        public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
            if (beanFactory instanceof ConfigurableListableBeanFactory) {
                this.beanFactory = (ConfigurableListableBeanFactory) beanFactory;
            }

        }

        public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
            if (this.beanFactory != null) {
                this.registerSyntheticBeanIfMissing(registry, "webServerFactoryCustomizerBeanPostProcessor", WebServerFactoryCustomizerBeanPostProcessor.class, WebServerFactoryCustomizerBeanPostProcessor::new);
                this.registerSyntheticBeanIfMissing(registry, "errorPageRegistrarBeanPostProcessor", ErrorPageRegistrarBeanPostProcessor.class, ErrorPageRegistrarBeanPostProcessor::new);
            }
        }

        private <T> void registerSyntheticBeanIfMissing(BeanDefinitionRegistry registry, String name, Class<T> beanClass, Supplier<T> instanceSupplier) {
            if (ObjectUtils.isEmpty(this.beanFactory.getBeanNamesForType(beanClass, true, false))) {
                RootBeanDefinition beanDefinition = new RootBeanDefinition(beanClass, instanceSupplier);
                beanDefinition.setSynthetic(true);
                registry.registerBeanDefinition(name, beanDefinition);
            }

        }
    }
}