springboot2.0 快速学习集成webSocket

关于webSocket是什么我在这里不做过多的阐述请参看文档：https://www.cnblogs.com/fuqiang88/p/5956363.html进行了解

我们直接进入实在代码让你来感受他是个什么东东。

首先第一步需要我们引入websocket的依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

如果使用外置的tomcat 需要引入javaee-api 我们这里不引入是因为我们使用的是内置的tomcat,spring-boot 内置tomcat 包含拉javaee-api 。

第二步配置webSocket 配置信息也就是配置webSocket 服务端点

package cn.lijunkui.springbootlearn.socket.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

import javax.websocket.server.ServerEndpoint;

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter(){
        return new ServerEndpointExporter();
    }
}

第三步开发接受和处理消息的处理类

package cn.lijunkui.springbootlearn.socket;

import org.springframework.stereotype.Controller;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@Controller
@ServerEndpoint("/websocket")
public class Socket {
    /*websocket 客户端会话 通过Session 向客户端发送数据*/
    private Session session;
    /*线程安全set 存放每个客户端处理消息的对象*/
    private static CopyOnWriteArraySet<Socket> webSocketSet = new CopyOnWriteArraySet();
    /*websocket 连接建立成功后进行调用*/
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
        System.out.println("websocket 有新的链接"+webSocketSet.size());
    }
    /*websocket 链接关闭调用的方法*/
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
    }
    /*收到客户端消息后调用的方法*/
    @OnMessage
    public void onMessage(String message) throws IOException {
        for (Socket socket : webSocketSet) {
            socket.session.getBasicRemote().sendText("自己嘎给自己嘎发的消息："+message);
        }
    }
    /*websocket 发生错误时进行调用*/
    @OnError
    public void onError(Session session,Throwable error){
        error.printStackTrace();
    }
    public void sendMessage(String message) throws IOException {
        for (Socket socket : webSocketSet) {
            socket.session.getBasicRemote().sendText(message);
        }
    }
    public Session getSession() {
        return session;
    }
    public void setSession(Session session) {
        this.session = session;
    }
}

第四部编写客户端访问页面 socket.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>socket demo</title>
</head>
<body>
    <h2>学说话的tom 猫</h2>
    <div><label>消息内容：</label><p id="serverMessage"></p></div>
    <div><label>我对自己说：</label><input id="sendMessage" type="text" />&nbsp;&nbsp;&nbsp;&nbsp;<button onclick="send()">发送</button></div>

<script type="text/javascript">

    var websocket = null;
    if('WebSocket' in window){
        websocket = new WebSocket('ws://localhost:8080/bootlearn/websocket');
    }else{
        alert("该游览器不知此WebSocket");
    }
    //websocket 链接成功后进行触发
    websocket.onopen = function (event){
        console.log("建立链接。。。。");
    }
    //websocket 链接关闭的进行触发
    websocket.onclose = function (event){
        console.log("关闭链接。。。。");
    }
    //接收到消息的进行触发
    websocket.onmessage = function(event){
        var serverMessage = document.getElementById("serverMessage");
        serverMessage.innerHTML= event.data;
        console.log("收到消息");
    }

    //连接发生错误的进行触发
    websocket.onerror = function(evt)
    {
        console.log("WebSocketError!");
    }
    //当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function (){
        websocket.close();
    }
    //关闭websocket连接
    function closeWebSocket(){
        websocket.close();
    }
    //发送消息
    function send(){
        var sendIput = document.getElementById("sendMessage");
        var sendMessage = sendIput.value;
        if(sendMessage.trim() == ""){
            alert("请输入发送消息！")
            return;
        }
        websocket.send(sendMessage);
    }

</script>
</body>
</html>

第五步编写通过后台发送消息的Controller

package cn.lijunkui.springbootlearn.socket;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

@RestController
@RequestMapping("socket")
public class SocketTestController {
    @Autowired
    private Socket socket;
    @GetMapping("/{message}")
    public void sendMessage(@PathVariable("message") String message) throws IOException {
        socket.sendMessage("这个是controller 发送的消息："+message);
    }
}

第六步编写通过后台进行消息的发送controllerTest.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h2>通过controller 进行发送消息</h2>
<input type="text" id="sendMessage"><button onclick="controllerSend()">发送</button>
</body>
<script language="JavaScript">
    function controllerSend(){
        var sendIput = document.getElementById("sendMessage");
        var sendMessage = sendIput.value;
        if(sendMessage.trim() == ""){
            alert("请输入发送消息！")
            return;
        }
        //创建异步对象
        var xhr = new XMLHttpRequest();
        //设置请求的类型及url
        xhr.open('get', 'http://localhost:8080/bootlearn/socket/'+sendMessage );
        //发送请求
        xhr.send();
        xhr.onreadystatechange = function () {
            // 这步为判断服务器是否正确响应
            if (xhr.readyState == 4 && xhr.status == 200) {
                console.log(xhr.responseText);
            }
        };
    }
</script>
</html>

好啦代码部分编写完毕接下来我们开始进行测试

启动springBoot

第二步打开游览器访问socket.html

发送消息：

访问controller 发送测试页面

发送消息

springboot2.0 快速学习集成webSocket

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