shell复制代码ls -al ~/.ssh/id_*.pub

shell复制代码ssh-keygen -t rsa -C "tigeriaf"

shell复制代码ssh-copy-id username@ip_address

shell复制代码ssh username@ip_address

js复制代码1. 电脑竟然乖乖的帮我打开了浏览器原理和源码实现
2. 学会使用 Node.js 强大的 child_process 模块
3. 学会调试学习源码
4. 等等

bash复制代码module.exports = {
  //...
  devServer: {
    open: true,
  },
};

bash复制代码npx webpack serve --open

bash复制代码npx webpack serve --no-open

bash复制代码npx @vue/cli create vue3-project
# 我的 open-analysis 项目中 vue3-project 文件夹
# npm i -g yarn
# yarn serve 不会自动打开浏览器
yarn serve
# --open 参数后会自动打开浏览器
yarn serve --open

bash复制代码npx create-react-app react-project
# 我的 open-analysis 项目中 react-project 文件夹
# npm i -g yarn
# 默认自动打开了浏览器
yarn start

bash复制代码积极维护。
支持应用参数。
更安全，因为它使用 spawn 而不是 exec。
修复了大多数 node-open 的问题。
包括适用于 Linux 的最新 xdg-open 脚本。
支持 Windows 应用程序的 WSL 路径。

bash复制代码# mac
open https://lxchuan12.gitee.io
# win
start https://lxchuan12.gitee.io
# linux
xdg-open https://lxchuan12.gitee.io

bash复制代码# 推荐克隆我的项目，保证与文章同步，同时测试文件齐全
git clone https://github.com/lxchuan12/open-analysis.git
# npm i -g yarn
cd open && yarn

# 或者克隆官方项目
git clone https://github.com/sindresorhus/open.git
# npm i -g yarn
cd open && yarn

js复制代码// open-analysis/examples/index.js
(async () => {
    const open = require('../open/index.js');
    await open('https://lxchuan12.gitee.io');
})();

bash复制代码node examples/index.js

js复制代码// open/index.js
const open = (target, options) => {
	if (typeof target !== 'string') {
		throw new TypeError('Expected a `target`');
	}

	return baseOpen({
		...options,
		target
	});
};

js复制代码// open/index.js
const childProcess = require('child_process');
const localXdgOpenPath = path.join(__dirname, 'xdg-open');

const {platform, arch} = process;
// 调试时我们可以自行调整修改平台，便于调试各个平台异同，比如 mac、win、linux
// const {arch} = process;
// mac
// const platform = 'darwin';
// win
// const platform = 'win32';
// const platform = '其他';

const baseOpen = async options => {
    options = {
		wait: false,
		background: false,
		newInstance: false,
		allowNonzeroExitCode: false,
		...options
	};
    // 省略部分代码
    // 命令
    let command;
    // 命令行参数
	const cliArguments = [];
    // 子进程选项
	const childProcessOptions = {};
    if (platform === 'darwin') {
        command = 'open';
        // 省略 mac 部分代码
    } else if (platform === 'win32' || (isWsl && !isDocker())) {
        // 省略 window 或者 window 子系统代码
        const encodedArguments = ['Start'];
    } else {
        const useSystemXdgOpen = process.versions.electron ||
            platform === 'android' || isBundled || !exeLocalXdgOpen;
        command = useSystemXdgOpen ? 'xdg-open' : localXdgOpenPath;
        // 省略 linux 代码
    }
    // 省略部分代码
    const subprocess = childProcess.spawn(command, cliArguments, childProcessOptions);
    
    // 省略部分代码
    subprocess.unref();

	return subprocess;
}

bash复制代码# mac
open https://lxchuan12.gitee.io
# win
start https://lxchuan12.gitee.io
# linux
xdg-open https://lxchuan12.gitee.io

yaml复制代码server:
  undertow:
    # 以下的配置会影响buffer,这些buffer会用于服务器连接的IO操作
    # 如果每次需要 ByteBuffer 的时候都去申请，对于堆内存的 ByteBuffer 需要走 JVM 内存分配流程（TLAB -> 堆），对于直接内存则需要走系统调用，这样效率是很低下的。
    # 所以，一般都会引入内存池。在这里就是 `BufferPool`。
    # 目前，UnderTow 中只有一种 `DefaultByteBufferPool`，其他的实现目前没有用。
    # 这个 DefaultByteBufferPool 相对于 netty 的 ByteBufArena 来说，非常简单，类似于 JVM TLAB 的机制
    # 对于 bufferSize，最好和你系统的 TCP Socket Buffer 配置一样
    # `/proc/sys/net/ipv4/tcp_rmem` (对于读取)
    # `/proc/sys/net/ipv4/tcp_wmem` (对于写入)
    # 在内存大于 128 MB 时，bufferSize 为 16 KB 减去 20 字节，这 20 字节用于协议头
    buffer-size: 16364
    # 是否分配的直接内存(NIO直接分配的堆外内存)，这里开启，所以java启动参数需要配置下直接内存大小，减少不必要的GC
    # 在内存大于 128 MB 时，默认就是使用直接内存的
    directBuffers: true
    threads:
      # 设置IO线程数, 它主要执行非阻塞的任务,它们会负责多个连接, 默认设置每个CPU核心一个读线程和一个写线程
      io: 4
      # 阻塞任务线程池, 当执行类似servlet请求阻塞IO操作, undertow会从这个线程池中取得线程
      # 它的值设置取决于系统线程执行任务的阻塞系数，默认值是IO线程数*8
      worker: 128

less复制代码@Log4j2
@Configuration(proxyBeanMethods = false)
//需要在引入了 prometheus 并且 actuator 暴露了 prometheus 端口的情况下才加载
@ConditionalOnEnabledMetricsExport("prometheus")
public class UndertowXNIOConfiguration {
    @Autowired
    private ObjectProvider<PrometheusMeterRegistry> meterRegistry;
    //只初始化一次
    private volatile boolean isInitialized = false;

    //需要在 ApplicationContext 刷新之后进行注册
    //在加载 ApplicationContext 之前，日志配置就已经初始化好了
    //但是 prometheus 的相关 Bean 加载比较复杂，并且随着版本更迭改动比较多，所以就直接偷懒，在整个 ApplicationContext 刷新之后再注册
    // ApplicationContext 可能 refresh 多次，例如调用 /actuator/refresh，还有就是多 ApplicationContext 的场景
    // 这里为了简单，通过一个简单的 isInitialized 判断是否是第一次初始化，保证只初始化一次
    @EventListener(ContextRefreshedEvent.class)
    public synchronized void init() {
        if (!isInitialized) {
            Gauge.builder("http_servlet_queue_size", () ->
            {
                try {
                    return (Integer) ManagementFactory.getPlatformMBeanServer()
                            .getAttribute(new ObjectName("org.xnio:type=Xnio,provider=\"nio\",worker=\"XNIO-2\""), "WorkerQueueSize");
                } catch (Exception e) {
                    log.error("get http_servlet_queue_size error", e);
                }
                return -1;
            }).register(meterRegistry.getIfAvailable());
            isInitialized = true;
        }
    }
}

bash复制代码# HELP http_servlet_queue_size  
# TYPE http_servlet_queue_size gauge
http_servlet_queue_size 0.0

js复制代码{
  "code": 200,
  "desc": "查询成功",
  "timestamp": "2020-08-12 14:37:11",
  "data": {
    "uid": "1597242780874",
    "name": "测试 1"
  }
}

java复制代码@ApiModel
@Data
public class Response<T> {
    @ApiModelProperty(value = "返回码", example = "200")
    private Integer code;
    @ApiModelProperty(value = "返回码描述", example = "ok")
    private String desc;
    @ApiModelProperty(value = "响应时间戳", example = "2020-08-12 14:37:11")
    private Date timestamp = new Date();
    @ApiModelProperty(value = "返回结果")
    private T data;
}

java复制代码@RequestMapping("hello1")
public Response<String> hello1() {
    final Response<String> response = new Response<>();
    response.setCode(200);
    response.setDesc("返回成功");
    response.setData("Hello, World!");
    return response;
}

js复制代码{
  "code": 200,
  "desc": "返回成功",
  "timestamp": "2020-08-12 14:37:11",
  "data": "Hello, World!"
}

java复制代码@RequestMapping("hello2")
public String hello2() {
    return "Hello, World!";
}

java复制代码/**
 * <br>created at 2020/8/12
 *
 * @author www.howardliu.cn
 * @since 1.0.0
 */
@RestControllerAdvice
public class ResultResponseAdvice implements ResponseBodyAdvice<Object> {
    @Override
    public boolean supports(final MethodParameter returnType, final Class<? extends HttpMessageConverter<?>> converterType) {
        return !returnType.getGenericParameterType().equals(Response.class);// 1
    }

    @Override
    public Object beforeBodyWrite(final Object body, final MethodParameter returnType, final MediaType selectedContentType,
                                  final Class<? extends HttpMessageConverter<?>> selectedConverterType,
                                  final ServerHttpRequest request, final ServerHttpResponse response) {
        if (body == null || body instanceof Response) {
            return body;
        }
        final Response<Object> result = new Response<>();
        result.setCode(200);
        result.setDesc("查询成功");
        result.setData(body);
        if (returnType.getGenericParameterType().equals(String.class)) {// 2
            ObjectMapper objectMapper = new ObjectMapper();
            try {
                return objectMapper.writeValueAsString(result);
            } catch (JsonProcessingException e) {
                throw new RuntimeException("将 Response 对象序列化为 json 字符串时发生异常", e);
            }
        }
        return result;
    }
}

/**
 * <br>created at 2020/8/12
 *
 * @author www.howardliu.cn
 * @since 1.0.0
 */
@RestController
public class HelloWorldController {
    @RequestMapping("hello2")
    public String hello2() {
        return "Hello, World!";
    }

    @RequestMapping("user1")
    public User user1() {
        User u = new User();
        u.setUid(System.currentTimeMillis() + "");
        u.setName("测试1");
        return u;
    }
}

java复制代码@Override
public boolean supports(final MethodParameter returnType, final Class<? extends HttpMessageConverter<?>> converterType) {
    final IgnoreResponseWrap[] declaredAnnotationsByType = returnType.getExecutable().getDeclaredAnnotationsByType(IgnoreResponseWrap.class);
    return !(declaredAnnotationsByType.length > 0 || returnType.getGenericParameterType().equals(Response.class));
}

java复制代码/**
 * 鱼香味猫粮
 *
 * @author 蝉沐风
 */
public class FishCatFood {

    //猫粮口味
    private String flavor;

		//制作猫粮的工艺过程
    public void make() {
        System.out.println("正在制作【" + flavor + "】口味的猫粮");
    }

    public String getFlavor() {
        return flavor;
    }

    public void setFlavor(String flavor) {
        this.flavor = flavor;
    }

    public FishCatFood(String flavor) {
        this.flavor = flavor;
    }
}

java复制代码public class PaoMaChang {

    public FishCatFood order() {
        FishCatFood fishCatFood = new FishCatFood("fish");
        fishCatFood.make();
        return fishCatFood;
    }
}

java复制代码/**
 * 猫粮的抽象类，所有具体口味的猫粮必须继承自该接口
 *
 * @author 蝉沐风
 */
public abstract class CatFood {
  	//产品风味
    String flavor;

    public abstract void make();
}

java复制代码/**
 * 牛肉猫粮
 */
public class BeefCatFood extends CatFood {
    public BeefCatFood() {
        this.flavor = "beef";
    }

    @Override
    public void make() {
        System.out.println("正在制作【beef】口味猫粮");
    }
}

/**
 * 鸡肉猫粮
 */
public class ChickenCatFood extends CatFood {
    public ChickenCatFood() {
        this.flavor = "chicken";
    }

    @Override
    public void make() {
        System.out.println("正在制作【chicken】口味猫粮");
    }
}

/**
 * 鱼香猫粮
 */
public class FishCatFood extends CatFood {
    public FishCatFood() {
        this.flavor = "fish";
    }

    @Override
    public void make() {
        System.out.println("正在制作【fish】口味猫粮");
    }
}

/**
 * 薄荷猫粮
 */
public class MintCatFood extends CatFood {
    public MintCatFood() {
        this.flavor = "mint";
    }

    @Override
    public void make() {
        System.out.println("正在制作【mint】口味猫粮");
    }
}

java复制代码public class PaoMaChang {

    public CatFood order(String flavor) {

        CatFood catFood;

        if ("fish".equals(flavor)) {
            catFood = new FishCatFood();
        } else if ("beef".equals(flavor)) {
            catFood = new BeefCatFood();
        } else if ("mint".equals(flavor)) {
            catFood = new MintCatFood();
        } else if ("chicken".equals(flavor)) {
            catFood = new ChickenCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        catFood.make();

        return catFood;
    }
}

java复制代码/**
 * 猫粮类的简单工厂
 * @author 蝉沐风
 */
public class SimpleCatFoodFactory {
    public static CatFood createCatFood(String flavor) {
        CatFood catFood;

        if ("fish".equals(flavor)) {
            catFood = new FishCatFood();
        } else if ("beef".equals(flavor)) {
            catFood = new BeefCatFood();
        } else if ("mint".equals(flavor)) {
            catFood = new MintCatFood();
        } else if ("chicken".equals(flavor)) {
            catFood = new ChickenCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;

    }
}


/**
 * 重构之后的order代码
 */
public class PaoMaChangV2 {

    public CatFood order(String flavor) {

        CatFood catFood = SimpleCatFoodFactory.createCatFood(flavor);

        catFood.make();

        return catFood;
    }
}

java复制代码/**
 * 反射优化后的猫粮类的简单工厂
 *
 * @author 蝉沐风
 */
public class SimpleCatFoodFactoryV2 {
    public static CatFood createCatFood(Class<? extends CatFood> clazz) {
        if (clazz != null) {
            try {
                return clazz.newInstance();
            } catch (Exception e) {
                throw new RuntimeException("对象不存在");
            }
        }
        return null;

    }
}

java复制代码public CatFood order(Class<? extends CatFood> clazz) {

    CatFood catFood = SimpleCatFoodFactoryV2.createCatFood(clazz);

    catFood.make();

    return catFood;
}

java复制代码/**
 * 跑码场对象-版本3
 * @author 蝉沐风
 */
public class PaoMaChangV3 {

    private ICatFoodFactory factory;

    public PaoMaChangV3(ICatFoodFactory factory) {
        this.factory = factory;
    }

    public CatFood order(String flavor) {

        CatFood catFood = factory.create(flavor);

        catFood.make();

        return catFood;
    }
}

java复制代码public interface ICatFoodFactory {
    CatFood create(String flavor);
}

java复制代码/**
 * 山东分公司简单工厂
 *
 * @author 蝉沐风
 */
public class ShanDongSimpleCatFoodFactory implements ICatFoodFactory {
    CatFood catFood;

    @Override
    public CatFood create(String flavor) {
        if ("congxiang".equals(flavor)) {
            catFood = new CongXiangCatFood();
        } else if ("dajiang".equals(flavor)) {
            catFood = new DaJiangCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;
    }
}

/**
 * 湖南分公司简单工厂
 *
 * @author 蝉沐风
 */
public class HuNanSimpleCatFoodFactory implements ICatFoodFactory {
    CatFood catFood;

    @Override
    public CatFood create(String flavor) {
        if ("duojiao".equals(flavor)) {
            catFood = new DuoJiaoCatFood();
        } else if ("mala".equals(flavor)) {
            catFood = new MaLaCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;
    }
}

java复制代码/**
 * 大酱猫粮
 */
public class DaJiangCatFood extends CatFood {
    public DaJiangCatFood() {
        this.flavor = "dajiang";
    }

    @Override
    public void make() {
        System.out.println("正在制作【大酱】口味猫粮");
    }
}

/**
 * 葱香猫粮
 */
public class CongXiangCatFood extends CatFood {
    public CongXiangCatFood() {
        this.flavor = "congxiang";
    }

    @Override
    public void make() {
        System.out.println("正在制作【葱香】口味猫粮");
    }
}

/**
 * 剁椒猫粮
 */
public class DuoJiaoCatFood extends CatFood {
    public DuoJiaoCatFood() {
        this.flavor = "duojiao";
    }

    @Override
    public void make() {
        System.out.println("正在制作【剁椒】口味猫粮");
    }
}

/**
 * 麻辣猫粮
 */
public class MaLaCatFood extends CatFood {
    public MaLaCatFood() {
        this.flavor = "mala";
    }

    @Override
    public void make() {
        System.out.println("正在制作【麻辣】口味猫粮");
    }
}

java复制代码public static void main(String[] args) {
    HuNanSimpleCatFoodFactory huNanSimpleCatFoodFactory = new HuNanSimpleCatFoodFactory();
    PaoMaChangV3 paoMaChang = new PaoMaChangV3(huNanSimpleCatFoodFactory);
    //下单剁椒猫粮
    paoMaChang.order("duojiao");
}

java复制代码/**
 * 湖南跑码场分公司
 * @author 蝉沐风
 */
public class HuNanPaoMaChangV3 {

    private ICatFoodFactory factory;

    public HuNanPaoMaChangV3(ICatFoodFactory factory) {
        this.factory = factory;
    }

    public CatFood order(String flavor) {

        CatFood catFood = factory.create(flavor);

        catFood.make();
        
        //湖南分公司自己添加了一个「包装」逻辑
        catFood.pack();

        return catFood;
    }

}

java复制代码/**
 * 跑码场对象-版本4
 * @author 蝉沐风
 */
public abstract class PaoMaChangV4 {

    public final CatFood order(String flavor) {

        CatFood catFood = create(flavor);

        catFood.make();

        return catFood;
    }
    
    //该方法需要子类继承
    public abstract CatFood create(String flavor);

}

java复制代码/**
 * 湖南跑码场分公司V4
 *
 * @author 蝉沐风
 */
public class HuNanPaoMaChangV4 extends PaoMaChangV4 {

    @Override
    public CatFood create(String flavor) {
        CatFood catFood;
        if ("duojiao".equals(flavor)) {
            catFood = new DuoJiaoCatFood();
        } else if ("mala".equals(flavor)) {
            catFood = new MaLaCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;
    }

}

/**
 * 山东跑码场分公司V4
 *
 * @author 蝉沐风
 */
public class ShanDongPaoMaChangV4 extends PaoMaChangV4 {

    @Override
    public CatFood create(String flavor) {
        CatFood catFood;
        if ("congxiang".equals(flavor)) {
            catFood = new CongXiangCatFood();
        } else if ("dajiang".equals(flavor)) {
            catFood = new DaJiangCatFood();
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;
    }
}

java复制代码//下单剁椒猫粮
public static void main(String[] args) {
  	//顾客首先需要一个湖南分公司的对象
    PaoMaChangV4 huNanPaoMaChangV4 = new HuNanPaoMaChangV4();
  	//然后下单
    huNanPaoMaChangV4.order("duojiao");
}

java复制代码public interface CatFoodIngredientAbstractFactory {
    // 肉类生产
    Meat createMeat();

    // 燕麦生产
    Oats createOats();

    // 果蔬生产
    FruitsAndVegetables createFruitsAndVegetables();

    // 牛磺酸生产
    Taurine createTaurine();
}

java复制代码/**
 * 山东分公司猫粮原料厂
 *
 * @author 蝉沐风
 */
public class ShanDongCatFoodIngredientFactory implements CatFoodIngredientAbstractFactory {
    @Override
    public Meat createMeat() {
        return new ShanDongMeat();
    }

    @Override
    public Oats createOats() {
        return new ShanDongOats();
    }

    @Override
    public FruitsAndVegetables createFruitsAndVegetables() {
        return new ShanDongFruitsAndVegetables();
    }

    @Override
    public Taurine createTaurine() {
        return new ShanDongTaurine();
    }
}

java复制代码/**
 * 猫粮的抽象类，所有具体口味的猫粮必须继承自该接口
 *
 * @author 蝉沐风
 */
public abstract class CatFoodV2 {
    public String flavor;

    public Meat meat;
    public Oats oats;
    public FruitsAndVegetables fruitsAndVegetables;
    public Taurine taurine;


    public abstract void make();
}

java复制代码/**
 * 大酱猫粮
 */
public class DaJiangCatFoodV2 extends CatFoodV2 {

    private CatFoodIngredientFactory catFoodIngredientFactory;

    public DaJiangCatFoodV2(CatFoodIngredientFactory catFoodIngredientFactory) {
        this.flavor = "dajiang";
        this.catFoodIngredientFactory = catFoodIngredientFactory;
    }

    @Override
    public void make() {
        System.out.println("正在使用原料：");
        System.out.println("肉：" + catFoodIngredientFactory.createMeat());
        System.out.println("燕麦：" + catFoodIngredientFactory.createOats());
        System.out.println("果蔬：" + catFoodIngredientFactory.createFruitsAndVegetables());
        System.out.println("牛磺酸：" + catFoodIngredientFactory.createTaurine());
        System.out.println("制作【大酱】口味猫粮");
    }
}

java复制代码/**
 * 跑码场对象-版本5
 *
 * @author 蝉沐风
 */
public abstract class PaoMaChangV5 {

    public final CatFoodV2 order(String flavor) {

        CatFoodV2 catFood = create(flavor);

        catFood.make();

        return catFood;
    }

    //该方法需要子类继承
    public abstract CatFoodV2 create(String flavor);

}

/**
 * 山东跑码场分公司V5
 *
 * @author 蝉沐风
 */
public class ShanDongPaoMaChangV5 extends PaoMaChangV5 {
    //山东分公司采用山东原料厂的原料
    CatFoodIngredientFactory catFoodIngredientFactory = new ShanDongCatFoodIngredientFactory();

    @Override
    public CatFoodV2 create(String flavor) {
        CatFoodV2 catFood;
        if ("congxiang".equals(flavor)) {
            catFood = new CongXiangCatFoodV2(catFoodIngredientFactory);
        } else if ("dajiang".equals(flavor)) {
            catFood = new DaJiangCatFoodV2(catFoodIngredientFactory);
        } else {
            throw new RuntimeException("找不到该口味的猫粮");
        }

        return catFood;
    }
}

java复制代码public interface CatFoodIngredientAbstractFactory {
    // 肉类生产
    Meat createMeat();

    // 燕麦生产
    Oats createOats();

    // 果蔬生产
    FruitsAndVegetables createFruitsAndVegetables();

    // 牛磺酸生产
    Taurine createTaurine();
}

java复制代码    @Value("${ruoyi.name}")
    private  String name ;

java复制代码@Component
@ConfigurationProperties(prefix = "ruoyi")
public class RuoYiConfig {    
    /**
     * 项目名称
     */
    private String name;
    /**
     * 版本
     */
    private String version;

yml复制代码# 项目相关配置
ruoyi:
  # 名称
  name: RuoYi
  # 版本
  version: 3.7.0

java复制代码
@Configuration
public class DruidConfig
{
    @Bean
    @ConfigurationProperties("spring.datasource.druid.master")
    public DataSource masterDataSource(DruidProperties druidProperties)
    {
        DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
        return druidProperties.dataSource(dataSource);
    }

    @Bean
    @ConfigurationProperties("spring.datasource.druid.slave")
    @ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
    public DataSource slaveDataSource(DruidProperties druidProperties)
    {
        DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
        return druidProperties.dataSource(dataSource);
    }

java复制代码public int sendMessage(int type, Message message) {
  if (type == 1) {
    // 省略业务处理
    return mail.sendMessage(message); // 进行邮件发送
  } else if (type == 2) {
    // 省略业务处理
    return mobile.sendMessage(message); // 进行手机短信发送
  } else if (type == 3) {
    // 省略业务处理
    return app.sendSendMessage(message); // 进行 app 消息推送
  } else if (type == 4){
    // ...
  }
  //...
}

java复制代码public interface ISendMessageStrategy {

  /**
   * 发送消息
   *
   * @param message 发送的消息内容
   */
  void sendMessage(Message message);
}

java复制代码/**
 * 邮件发送的实现
 **/
@Slf4j
public class EmailSendMessageStrategy implemets ISendMessageStrategy {
    @Override
    public void sendMessage(Message message) {
        // 省略业务处理
        mail.sendMessage(message);
  }
}

/**
 * 短信发送的实现
 **/
public class MobileSendMessageStrategy implemets ISendMessageStrategy {
    @Override
    public void sendMessage(Message message) {
        // 省略业务处理
        phone.sendMessage(message);
  }
}

java复制代码public class SendMessageHandler {

  /**
   * 持有策略抽象类
   */
  private ISendMessageStrategy sendMessageStrategy;

  // 通过构造方法注入，也可以通过其他方式注入
  public SendMessageHandler(ISendMessageStrategy sendMessageStrategy) {
    this.sendMessageStrategy = sendMessageStrategy;
  }

  public void sendMessage(Message message) {
    return sendMessageStrategy.sendMessage(message);
  }

}

java复制代码public class Test {
  public static void main(String[] args) {
    SendMessageHandler handler = new SendMessageHandler(new MobileSendMessageStrategy());
    handler.sendMessage(new Message());
  }
}

kotlin复制代码@Component("mobileSendMessageStrategy")
public class MobileSendMessageStrategy implemets ISendMessageStrategy {
    // ...
}

java复制代码@Component
public class SendMessageHandler implements ApplicationContextAware {

    private final Map<String, ISendMessageStrategy> strategyMap = new ConcurrentHashMap<>();

    public ISendMessageStrategy get(String beanName) {
        return strategyMap.get(beanName);
    }

    @Override
    public void setApplicationContext(ApplicationContext context) throws Exception {
        strategyMap = applicationContext.getBeansOfType(ISendMessageStrategy.class);
    }
}

java复制代码public class Test {
    @Resource
    private SendMessageHandler messageHandler;

    public void test() {
        messageHandler.get("mobileSendMessageStrategy").sendMessage(new Message());
    }
}

java复制代码public enum TypeEnum {

  MAIL(0, "mailSendMessageStrategy", "邮件"),
  MOBILE(1, "mobileSendMessageStrategy", "短信"),
  APP(2, "appSendMessageStrategy", "app");

  TypeEnum(int type, String serviceName, String desc) {
    this.type = type;
    this.serviceName = serviceName;
    this.desc = desc;
  }

  public static TypeEnum valueOf(int type) {
    for (TypeEnum typeEnum : TypeEnum.values()) {
      if (typeEnum.getType() == type) {
        return typeEnum;
      }
    }
    return null;
  }

  private int type;

  private String serviceName;

  private String desc;

  public int getType() {
    return type;
  }

  public String getServiceName() {
    return serviceName;
  }

  public String getDesc() {
    return desc;
  }
}

java复制代码@Component
public class SendMessageHandler implements ApplicationContextAware {

    private final Map<String, ISendMessageStrategy> strategyMap = new ConcurrentHashMap<>();

    public ISendMessageStrategy get(int type) {
        TypeEnum typeEnum = TypeEnum.valueOf(type);
        return strategyMap.get(typeEnum.getServiceName());
    }

    @Override
    public void setApplicationContext(ApplicationContext context) throws Exception {
        strategyMap = applicationContext.getBeansOfType(ISendMessageStrategy.class);
    }
}

java复制代码public class Test {
    @Resource
    private SendMessageHandler messageHandler;

    public void test() {
        int type = 1;
        messageHandler.get(type).sendMessage(new Message());
    }
}