SSE 和 WebSocket 应用

一.SSE 和 WebSocket 对比

SSE 全称 Server-Send Events 基于 HTTP 的单向通信协议
WebSocket 基于 HTTP 封装的 WS 双向通信协议

二.SSE 和 WebSocket 调试

JVM 版本

SpringBoot 下 SSE 应用

1.依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>socket-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>20</maven.compiler.source>
        <maven.compiler.target>20</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>3.1.3</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.28</version>
        </dependency>

    </dependencies>


</project>

2.启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author Administrator
 */
@SpringBootApplication
public class SocketDemoApp {
   
    public static void main(String[] args) {
   
        SpringApplication.run(SocketDemoApp.class,args);
    }
}

3.接口类

package org.example.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;

import java.io.IOException;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author zhuwd && moon
 * @Description
 * @create 2023-09-04 22:53
 */
@Slf4j
@CrossOrigin
@RestController
@RequestMapping("/test")
public class TestController {
   

    /**
     * 线程副本变量
     */
    private ThreadLocal<AtomicReference<Boolean>> isSendThreadLocal = new ThreadLocal<>();

    /**
     * 缓存线程
     */
    private Map<Integer,AtomicReference<Boolean>> sidThreadMap = new ConcurrentHashMap<>();

    /**
     * Server Send Event
     *
     * @param type 1 温度 2 湿度
     * @return
     */
    @GetMapping(value = "/sse", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public synchronized SseEmitter sendToClient(int sid,int type){
   
        SseEmitter emitter = new SseEmitter(1000000L);
        // 模拟生成实时股票价格并推送给客户端
        Random random = new Random();
        new Thread(() -> {
   
            try {
   
                //缓存当前线程
                AtomicReference temp &