js复制代码#!/bin/bash

#异常直接中断流程，退出脚本
set -e 

#接收两个参数，第1个参数为用户名，第2个参数为命令空间(可选)
name=$1
namespace=$2

#如果不设置用户名，默认为dmp+随机数
if [ -z $name ];then
  name=dmp`date +%N`
fi

#如果不设置namespace，默认为test命令空间
if [ -z $namespace ];then
  namespace="test"
fi

group=peach
caPath=/etc/kubernetes/pki/

#1. 创建用户证书私钥
openssl genrsa -out ${name}.key 2048

#2. 创建证书签名文件
openssl req -new -key ${name}.key -out ${name}.csr -subj "/CN=${name}/O=${group}"

#3. 生成最终证书文件
openssl x509 -req -in ${name}.csr -CA ${caPath}ca.crt -CAkey ${caPath}ca.key -CAcreateserial -out ${name}.crt -days 3650

#4. 创建集群凭证
kubectl config set-credentials ${name} --client-certificate=${name}.crt  --client-key=${name}.key

#5. 创建集群上下文context
cluster=`kubectl config get-clusters | grep -v NAME`
kubectl config set-context ${name}-context --cluster=${cluster} --namespace=${namespace} --user=${name}

#6. 创建用户成功提示
echo "----------------"
echo "创建用户成功\n"
echo "用户名: ${name} namespace: $namespace\n"
#查看当前已创建的users和contexts
echo "------显示user列表-------" && kubectl config get-users 
echo "------显示context列表-------" && kubectl config get-contexts
echo "----------------"
echo "接下来创建k8s集群角色和权限"

#7. 编写角色配置文件
cat >> role.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: ${namespace}
  name: ${name}-log-role
rules:
- apiGroups: [""]
  resources: ["pods", "pods/log"]
  verbs: ["get", "list"]

EOF

# 替换角色配置(可选)
#sed 's/NS/${namespace}/g' role.yaml
#8. 创建角色
kubectl apply -f role.yaml

#9. 编写角色权限绑定配置文件
cat >> rolebinding.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: ${name}-hangzhou-rolebinding
  namespace: ${namespace}
subjects:
- kind: User
  name: ${name}
  apiGroup: ""
roleRef:
  kind: Role
  name: ${namespace}-log-role
  apiGroup: ""
EOF

#10. 创建角色权限绑定
kubectl apply -f rolebinding.yaml

#11. 创建权限成功提示
echo "----------------"
echo "创建角色权限成功\n"
#权限测试
kubectl get pods -n ${namespace} --context=${name}-context
#查看角色和角色绑定列表并过滤用户名
echo "-----查看角色列表----"
kubectl get role -A | grep ${name}
echo "-----查看角色绑定列表----"
kubectl get rolebinding -A | grep ${name}
echo "查看pod命令: kubectl get pods -n ${namespace} --context=${name}-context"
echo "-------脚本处理完成，谢谢使用---------"

python复制代码def base64_encrypt(text):
    """
    base64加密
    :param text: 文本
    :return: 
    """
    encrypt = base64.b64encode(str(text).encode('utf-8'))
    return str(encrypt, "utf-8")

python复制代码import base64
import requests


def jujin_cat_spider():
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) '
                      'Chrome/81.0.4044.43 Safari/537.36',
        'Referer': 'https://juejin.cn/'
    }
    url = "https://api.juejin.cn/content_api/v1/short_msg/list_by_theme?aid=2608&uuid=6983930498641806848"

    cursor = '{"v":"7023596252935766053","i":0}'

    cursor = base64_encrypt(cursor)
    print("加密后：", cursor)

    data = {
        "theme_id": "7007350783603638279",
        "sort": 1,
        "limit": 20,
        "cursor": cursor
    }
    res = requests.post(url, json=data, headers=headers)
    print(res.json())


jujin_cat_spider()

bash复制代码##配置tnsnames.ora
cat <<EOF>>$TNS_ADMIN/tnsnames.ora  
ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 10.211.55.100)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )
EOF

bash复制代码##创建导出目录
mkdir -p /oradata/rmanbak/orcl
sqlplus / as sysdba
create or replace directory DATA_DUMP_ORCL as '/oradata/rmanbak/orcl';

bash复制代码##创建ORCL的dblink用来传输dump到本地
sqlplus / as sysdba
create public database link DBLINK_ORCL connect to SYSTEM identified by  using 'ORCL';

--drop public database link DBLINK_ORCL;

bash复制代码--远程导出角色
expdp system/oracle network_link=dblink_orcl directory=DATA_DUMP_ORCL dumpfile=role.dmp full=y include=role LOGFILE=role_expdp.log

bash复制代码##编写expdp导出命令脚本
cat <<EOF>>/oradata/rmanbak/orcl/expdp_all_orcl.txt
directory=DATA_DUMP_ORCL
dumpfile=orcl_\%U.dmp
logfile=orcl_exp.log
SCHEMAS='A','B','C','D'
EXCLUDE=table:"in('AAAAA')"
parallel=4
filesize=30G
network_link=DBLINK_ORCL
EOF

##授予执行权限
chmod +x expdp_all_orcl.txt

expdp system/oracle parfile=expdp_all_orcl.txt

bash复制代码Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /oradata/rmanbak/orcl/orcl_01.dmp
  /oradata/rmanbak/orcl/orcl_02.dmp
  /oradata/rmanbak/orcl/orcl_03.dmp
  /oradata/rmanbak/orcl/orcl_04.dmp
  /oradata/rmanbak/orcl/orcl_05.dmp
  /oradata/rmanbak/orcl/orcl_06.dmp
  /oradata/rmanbak/orcl/orcl_07.dmp
  /oradata/rmanbak/orcl/orcl_08.dmp

java复制代码
//从头部入队列
    public void insertFront(int data){
        if(isFull()){
            System.out.println("Queue is full");
        }else{
            //从头部插入ArrayDeque
            head = (head + capacity - 1) % capacity;
            array[head]= data;
            //如果插入之前队列为空,将real指向head
            if(rear == -1 ){
                rear = head;
            }
        }
    }

 //从尾部取数据
    public int deleteLast(){
        int data;
        if(isEmpty()){
            System.out.println("Queue is empty");
            return -1;
        }else{
            data= array[rear];
            //如果只有一个元素，则重置head和real
            if(head == rear){
                head= -1;
                rear = -1;
            }else{
                rear = (rear + capacity - 1)%capacity;
            }
            return data;
        }
    }

java复制代码    //因为是循环数组，这里不能做简单的数组拷贝
    private void extendQueue(){
        int newCapacity= capacity*2;
        int[] newArray= new int[newCapacity];
        //先全部拷贝
        System.arraycopy(array,0,newArray,0,array.length);
        //如果rear<head,表示已经进行循环了，需要将0-head之间的数据置空，并将数据拷贝到新数组的相应位置
        if(rear < head){
            for(int i=0; i< head; i++){
                //重置0-head的数据
                newArray[i]= -1;
                //拷贝到新的位置
                newArray[i+capacity]=array[i];
            }
            //重置rear的位置
            rear = rear +capacity;
            //重置capacity和array
            capacity=newCapacity;
            array=newArray;
        }
    }

java复制代码public class LinkedListDeQueue {
    //head节点
    private Node headNode;
    //rear节点
    private Node rearNode;

    class Node {
        int data;
        Node next;
        Node prev;
        //Node的构造函数
        Node(int d) {
            data = d;
        }
    }

    public boolean isEmpty(){
        return headNode==null;
    }

    //从队尾插入
    public void insertLast(int data){
        Node newNode= new Node(data);
        //将rearNode的next指向新插入的节点
        if(rearNode !=null){
            rearNode.next=newNode;
            newNode.prev=rearNode;
        }
        rearNode=newNode;
        if(headNode == null){
            headNode=newNode;
        }
    }

    //从队首插入
    public void insertFront(int data){
        if(headNode == null){
            headNode= new Node(data);
        }else{
            Node newNode= new Node(data);
            newNode.next= headNode;
            headNode.prev= newNode;
            headNode= newNode;
        }
    }

    //从队首删除
    public int deleteFront(){
        int data;
        if(isEmpty()){
            System.out.println("Queue is empty");
            return -1;
        }else{
            data=headNode.data;
            headNode=headNode.next;
            headNode.prev=null;
        }
        return data;
    }

    //从队尾删除
    public int deleteLast(){
        int data;
        if(isEmpty()){
            System.out.println("Queue is empty");
            return -1;
        }else{
            data=rearNode.data;
            rearNode=rearNode.prev;
            rearNode.next=null;
        }
        return data;
    }

}

java复制代码/**
 * @ClassName Cup
 * @Desc 杯子的接口
 * @Author YangMingYu
 * @Date 2021/10/29 3:54 下午
 * @Version 1.0
 **/
public interface Cup {
    /**
     * 装水
     */
    public void takeInWater();
}

java复制代码/**
 * @ClassName LargeCup
 * @Desc 大杯子可以装1000ml
 * @Author YangMingYu
 * @Date 2021/10/29 3:54 下午
 * @Version 1.0
 **/
public class LargeCup implements Cup{
    @Override
    public void takeInWater() {
        System.out.println("i can take 1000ml water！！！");
    }
}

/**
 * @ClassName SmallCup
 * @Desc 小杯子可以装500ml
 * @Author YangMingYu
 * @Date 2021/10/29 3:55 下午
 * @Version 1.0
 **/
public class SmallCup implements Cup {
    @Override
    public void takeInWater() {
        System.out.println("i can only take 500ml water！！！");
    }
}

java复制代码/**
 * @ClassName CupDecorator
 * @Desc 带有装饰物的杯子
 * @Author YangMingYu
 * @Date 2021/10/29 3:56 下午
 * @Version 1.0
 **/
public abstract class DecoratorCup implements Cup {

    protected Cup decoratorCup;

    public DecoratorCup(Cup cup) {
        this.decoratorCup = cup;
    }

    /**
     * 实现装水的操作
     */
    public void takeInWater() {
        decoratorCup.takeInWater();
        takeDecorator();
    }

    /**
     * 带挂件，具体挂件是什么实现类决定
     */
    public abstract void takeDecorator();

}

java复制代码/**
 * @ClassName LittleBearDecoratorCup
 * @Desc 带有小熊装饰物的杯子
 * @Author YangMingYu
 * @Date 2021/10/29 3:59 下午
 * @Version 1.0
 **/
public class LittleBearDecoratorCup extends DecoratorCup {

    public LittleBearDecoratorCup(Cup cup) {
        super(cup);
    }

    public void takeDecorator() {
        System.out.println("i take a little bear");
    }
}

java复制代码public interface ElectronicsFactory {	
	/**
	 * 生产pad
	 * @return
	 */
	Pad producePad();
	
	/**
	 * 生产手机
	 * @return
	 */
	Mobile produceMobile();
	
}

java复制代码public class HuaweiFactory implements ElectronicsFactory{

	@Override
	public Pad producePad() {
		return new HuaweiPad();
	}

	@Override
	public Mobile produceMobile() {
		return new HuaweiMobile();
	}

}

java复制代码public class AppleFactory implements ElectronicsFactory{

	@Override
	public Pad producePad() {
		return new Ipad();
	}

	@Override
	public Mobile produceMobile() {
		return new IphoneMoible();
	}

}

java复制代码public abstract class Mobile {
	public abstract void produce();

}

java复制代码public abstract class Pad {
	
	public abstract void produce();
}

java复制代码public class IphoneMoible extends Mobile{
	public void produce() {
		System.out.println("Apple produce Iphone12 mobile");
	}

}

java复制代码public class HuaweiMobile extends Mobile {

	public void produce() {
		System.out.println("Huawei produce P40 mobile");		
	}
}

java复制代码public class Ipad extends Pad{

	@Override
	public void produce() {
		System.out.println("Apple produce ipad air");
	}
}

java复制代码public class HuaweiPad extends Pad{

	@Override
	public void produce() {
		System.out.println("Huawei produce mate pad");
		
	}
}

java复制代码public class Client {

	public static void main(String[] args) {
		// 指定苹果电子工厂
        ElectronicsFactory electronicsFactory = new AppleFactory();
        //生产苹果系列产品
        Pad pad = electronicsFactory.producePad();
        Mobile mobile =  electronicsFactory.produceMobile();
        //生产
        pad.produce();
        mobile.produce();
	}

}

java复制代码Apple produce ipad air
Apple produce Iphone12 mobile

java复制代码public static void testJdbcSql(){
		String driverClassName = "com.mysql.jdbc.Driver";
		String url = "jdbc:mysql://127.0.0.1:3306/test";
		String mysqlusername = "root";
		String password = "123";
		Connection con = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		try
		{
			Class.forName(driverClassName);
			con = DriverManager.getConnection(url, mysqlusername, password);
			String sql = "SELECT * FROM USER WHERE username=?";
			...//略
		} catch (Exception e){
            ...//略
		}
	}

java复制代码public interface Connection {
    //提供一个执行对象
    Statement createStatement() throws SQLException;
    //提供一个支持预编译的执行对象
    PreparedStatement prepareStatement(String sql) throws SQLException;
    //提供一个支持存储过程的执行对象
    CallableStatement prepareCall(String sql) throws SQLException;
}

java复制代码public class Driver extends NonRegisteringDriver implements java.sql.Driver {
    //注册DriverManager
    static {
        try {
            java.sql.DriverManager.registerDriver(new Driver());
        } catch (SQLException E) {
            throw new RuntimeException("Can't register driver!");
        }
    }
}

public class DriverManager {
    // 注册的JDBC驱动程序列表
    private final static CopyOnWriteArrayList<DriverInfo> registeredDrivers = new CopyOnWriteArrayList<>();
    ....//省略
    // 注册驱动
    public static synchronized void registerDriver(java.sql.Driver driver,
            DriverAction da)
        throws SQLException {

        /* Register the driver if it has not already been added to our list */
        if(driver != null) {
            registeredDrivers.addIfAbsent(new DriverInfo(driver, da));
        } else {
            // This is for compatibility with the original DriverManager
            throw new NullPointerException();
        }
        println("registerDriver: " + driver);
    }
    .... //省略代码
}

java复制代码
public class DriverManager {
  
// 获取连接
private static Connection getConnection(
        String url, java.util.Properties info, Class<?> caller) throws SQLException {
for(DriverInfo aDriver : registeredDrivers) {
            // If the caller does not have permission to load the driver then
            // skip it.
            if(isDriverAllowed(aDriver.driver, callerCL)) {
                try {
                    println("    trying " + aDriver.driver.getClass().getName());
                    Connection con = aDriver.driver.connect(url, info);
                    if (con != null) {
                        // Success!
                        println("getConnection returning " + aDriver.driver.getClass().getName());
                        return (con);
                    }
      ... //省略
 }

sh复制代码pip install pillow

python复制代码from PIL import Image

img = Image.open('watermark_pic.png')
width, height = img.size

python复制代码for i in range(width):
    for j in range(height):
        pos = (i, j)
        print(img.getpixel(pos)[:3])

python复制代码if sum(img.getpixel(pos)[:3]) >= 651:
    img.putpixel(pos, (255, 255, 255))

python复制代码from PIL import Image

img = Image.open('watermark_pic.png')
width, height = img.size

for i in range(width):
    for j in range(height):
        pos = (i, j)
        if sum(img.getpixel(pos)[:3]) >= 651:
            img.putpixel(pos, (255, 255, 255))

img.save('watermark_removed_pic.png')

sh复制代码pip install pymupdf

python复制代码import fitz


doc = fitz.open("数据结构和算法手册@公众号渡码.pdf")

for page in doc:
    pix = page.get_pixmap()

python复制代码from itertools import product

for pos in product(range(pix.width), range(pix.height)):
    if sum(pix.pixel(pos[0], pos[1])) >= 651:
        pix.set_pixel(pos[0], pos[1], (255, 255, 255))

python复制代码from itertools import product
import fitz


doc = fitz.open("数据结构和算法手册@公众号渡码.pdf")

page_no = 0
for page in doc:
    pix = page.get_pixmap()

    for pos in product(range(pix.width), range(pix.height)):
        if sum(pix.pixel(pos[0], pos[1])) >= 651:
            pix.set_pixel(pos[0], pos[1], (255, 255, 255))

    pix.pil_save(f"pdf_pics/page_{page_no}.png", dpi=(30000, 30000))

    print(f'第 {page_no} 页去除完成')
    page_no += 1

java复制代码void addTransformer(ClassFileTransformer transformer,boolean canRetransform)

void addTransformer(ClassFileTransformer transformer)

java复制代码void redefineClasses(ClassDefinition... definitions)
              throws ClassNotFoundException,
                     UnmodifiableClassException

java复制代码byte[] transform(ClassLoader loader,
                 String className,
                 Class<?> classBeingRedefined,
                 ProtectionDomain protectionDomain,
                 byte[] classfileBuffer)
          throws IllegalClassFormatException

java复制代码public static void premain(String agentArgs, Instrumentation inst);

public static void premain(String agentArgs);

java复制代码public static void agentmain(String agentArgs, Instrumentation inst);


public static void agentmain(String agentArgs);

xml复制代码    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                    <archive>
                        <!--自动添加META-INF/MANIFEST.MF -->
                        <manifest>
                            <addClasspath>true</addClasspath>
                        </manifest>
                        <manifestEntries>
                            <Premain-Class>xxx</Premain-Class>
                            <Agent-Class>xxx</Agent-Class>
                            <Can-Redefine-Classes>true</Can-Redefine-Classes>
                            <Can-Retransform-Classes>true</Can-Retransform-Classes>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>

        </plugins>
    </build>

java复制代码@RestController
public class MainController {
    @RequestMapping("/index")
    public String index(){
        return "hello world";
    }
}

java复制代码public class MyClassFileTransformer implements ClassFileTransformer

{
    @SneakyThrows
    @Override
    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
        ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
        if (className.contains("MainController")){
            final ClassPool classPool = ClassPool.getDefault();
            final CtClass clazz = classPool.get("com.cf.springboot.controller.MainController");
            CtMethod convertToAbbr = clazz.getDeclaredMethod("index");
            String methodBody = "return \"hello world【version2]\";";
            convertToAbbr.setBody(methodBody);
            // 返回字节码，并且detachCtClass对象
            byte[] byteCode = clazz.toBytecode();
            //detach的意思是将内存中曾经被javassist加载过的Date对象移除，如果下次有需要在内存中找不到会重新走javassist加载
            clazz.detach();
            return byteCode;
        }
        // 如果返回null则字节码不会被修改
        return null;
    }
}

java复制代码public class BeforeJvmAgent {
    public static void premain(String agentArgs, Instrumentation inst) {
        System.out.println("premain invoke!");

        inst.addTransformer(new MyClassFileTransformer());
    }

    public static void main(String[] args) {
        System.out.println("main invoke!");
    }

}

java复制代码public class AfterJvmAgent {
    public static void agentmain(String agentArgs, Instrumentation inst)
        throws ClassNotFoundException, UnmodifiableClassException {
        inst.addTransformer(new MyClassFileTransformer(), true);
        // 关键点
        inst.retransformClasses(Class.forName("com.cf.springboot.controller.MainController",false,ClassLoader.getSystemClassLoader()));
    }

    public static void main(String[] args) {

    }

}

java复制代码public static void main(String[] args) throws Exception{
    List<VirtualMachineDescriptor> list = VirtualMachine.list();
    for (VirtualMachineDescriptor vmd : list) {
        //如果虚拟机的名称为 xxx 则 该虚拟机为目标虚拟机，获取该虚拟机的 pid
        //然后加载 agent.jar 发送给该虚拟机
        System.out.println(vmd.displayName());
        if (vmd.displayName().equals("com.cf.springboot.Application")) {
            VirtualMachine virtualMachine = VirtualMachine.attach(vmd.id());
            virtualMachine.loadAgent("/Users/zhuyu/code/spring-boot/after_jvm_agent/target/after_jvm_agent-0.0.1-SNAPSHOT.jar");
            virtualMachine.detach();
        }
    }
}

java复制代码-Xms4096M -Xmx4096M -Xmn1024M
-XX:PermSize=512M
-XX:MaxPermSize=512M

java复制代码Perm区在jdk 1.8已经过时，被Meta区取代，
因此-XX:PermSize=512M -XX:MaxPermSize=512M配置会被忽略，
真正控制Meta区GC的参数为
-XX:MetaspaceSize:
Metaspace初始大小，64位机器默认为21M左右
 
-XX:MaxMetaspaceSize:
Metaspace的最大值，64位机器默认为18446744073709551615Byte，
可以理解为无上限
 
-XX:MaxMetaspaceExpansion:
增大触发metaspace GC阈值的最大要求
 
-XX:MinMetaspaceExpansion:
增大触发metaspace GC阈值的最小要求，默认为340784Byte

java复制代码# jstat -gc 31247
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT
37888.0 37888.0 0.0 32438.5 972800.0 403063.5 3145728.0 2700882.3 167320.0 152285.0 18856.0 16442.4 15189 597.209 65 70.447 667.655

java复制代码-Xms4096M -Xmx4096M -Xmn2048M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:+CMSScavengeBeforeRemark

java复制代码-Xms4096M -Xmx4096M -Xmn2048M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC

java复制代码-Xms4096M -Xmx4096M -Xmn1536M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark

java复制代码-Xms4096M -Xmx4096M -Xmn1024M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark

java复制代码-Xms4096M -Xmx4096M -Xmn1536M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark

java复制代码-Xms4096M -Xmx4096M -Xmn1024M
-XX:PermSize=512M
-XX:MaxPermSize=512M

java复制代码-Xms4096M -Xmx4096M -Xmn2048M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark

java复制代码-Xms4096M -Xmx4096M -Xmn1536M 
-XX:MetaspaceSize=256M 
-XX:MaxMetaspaceSize=256M 
-XX:+UseParNewGC 
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark 
-XX:CMSInitiatingOccupancyFraction=75 
-XX:+UseCMSInitiatingOccupancyOnly

java复制代码-Xms4096M -Xmx4096M -Xmn1536M 
-XX:MetaspaceSize=256M 
-XX:MaxMetaspaceSize=256M 
-XX:+UseParNewGC 
-XX:+UseConcMarkSweepGC 
-XX:+CMSScavengeBeforeRemark 
-XX:CMSInitiatingOccupancyFraction=75 
-XX:+UseCMSInitiatingOccupancyOnly