springbootwebsocket简单⼊门⽰例
之前做的需求都是客户端请求服务器响应，新需求是服务器主动推送信息到客户端.百度之后有流、长轮询、websoket等⽅式进⾏.但是⽬前更加推崇且合理的显然是websocket.
从springboot官⽹翻译了⼀些资料，再加上百度简单实现了springboot使⽤websocekt与客户端的双⼯通信.
1.⾸先搭建⼀个简单的springboot环境
<!-- Inherit defaults from Spring Boot -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
</parent>
<!-- Add typical dependencies for a web application -->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
2.引⼊springboot整合websocket依赖
<!-- mvnrepository/artifact/org.springframework.boot/spring-boot-starter-websocket -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>2.0.4.RELEASE</version>
</dependency>
3.创建启动springboot的核⼼类
package com;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class GlobalConfig {
public static void main(String[] args) {
SpringApplication.run(GlobalConfig.class, args);
}
}
4.创建websocket服务器
正如，需要实现WebSocketHandler或者继承TextWebSocketHandler/BinaryWebSocketHandler当中的任意⼀个.
package com.xiaoer.handler;
import com.alibaba.fastjson.JSONObject;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import java.util.HashMap;
import java.util.Map;
/**
* 相当于controller的处理器
*/
public class MyHandler extends TextWebSocketHandler {
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
String payload = Payload();
Map<String, String> map = JSONObject.parseObject(payload, HashMap.class);
System.out.println("=====接受到的数据"+map);
session.sendMessage(new TextMessage("服务器返回收到的信息," + payload));
}
}
5.注册处理器
package fig;
import com.xiaoer.handler.MyHandler;
import t.annotation.Configuration;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.fig.annotation.EnableWebSocket;
import org.springframework.fig.annotation.WebSocketConfigurer;
import org.springframework.fig.annotation.WebSocketHandlerRegistry;
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(myHandler(), "myHandler/{ID}");
}
public WebSocketHandler myHandler() {
return new MyHandler();
}
}
6.运⾏访问
出现如上图是因为不能直接通过http协议访问，需要通过html5的ws://协议进⾏访问.
7.创建Html5 客户端
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
<script src="code.jquery/jquery-3.1.1.min.js"></script>
<script>
var userID="888";
var websocket=null;
$(function(){
connectWebSocket();
})
//建⽴WebSocket连接
function connectWebSocket(){
console.log("开始...");
//建⽴webSocket连接
websocket = new WebSocket("ws://127.0.0.1:8080/myHandler/ID="+userID);
//打开webSokcet连接时，回调该函数
console.log("onpen");
}
//关闭webSocket连接时，回调该函数
//关闭连接html5开发示例
console.log("onclose");
}
//接收信息
console.log(msg.data);
}
}
//发送消息
function send(){
var postValue={};
postValue.id=userID;
websocket.send(JSON.stringify(postValue));
}
//关闭连接
function closeWebSocket(){
if(websocket != null) {
websocket.close();
}
}
</script>
</body>
</html>
8.运⾏
利⽤客户端运⾏之后仍然会出现上图中的⼀连接就中断了websocket连接.
这是因为spring默认不接受跨域访问:
As of Spring Framework 4.1.5, the default behavior for WebSocket and SockJS is to accept only same origin requests.
需要在WebSocketConfig中设置setAllowedOrigins.
package fig;
import com.xiaoer.handler.MyHandler;
import t.annotation.Configuration;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.fig.annotation.EnableWebSocket;
import org.springframework.fig.annotation.WebSocketConfigurer;
import org.springframework.fig.annotation.WebSocketHandlerRegistry;
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(myHandler(), "myHandler/{ID}")
.
setAllowedOrigins("*");
}
public WebSocketHandler myHandler() {
return new MyHandler();
}
}
如下图，并未输出中断，说明连接成功.
9.服务器和客户端的相互通信
服务器端收到消息
客户端收到服务器主动推送消息
以上就是⼀个最基础的springboot简单应⽤.还可以通过、重写WebSocketConfigurer中的⽅法进⾏更为复杂的属性操作.具体可以参考
以上就是本⽂的全部内容，希望对⼤家的学习有所帮助，也希望⼤家多多⽀持。

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