Spring Boot —websocket
首先导入依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
$(function(){
//发送消息
$("#send").click(function(){
console.log("send....")
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else {
console.log("您的浏览器支持WebSocket");
console.log('{"all":1,"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
socket.send('{"all":1,"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
}
})
//进入链接
$("#go").click(function(){
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else {
console.log("您的浏览器支持WebSocket");
//创建ws链接,根据输入的userid
var socketUrl = "http://localhost:8080/demo/" + $("#userid").val();
socketUrl = socketUrl.replace("https", "ws").replace("http", "ws");
console.log(socketUrl);
socket = new WebSocket(socketUrl);
//根据服务器返回异步的打开事件
socket.onopen = function () {
console.log("websocket已打开");
//socket.send("这是来自客户端的消息" + location.href + new Date());
};
//根据服务器返回异步的获得消息事件
socket.onmessage = function(msg) {
//获取到发送的消息
var a = JSON.stringify(msg);
console.log(a);
};
}
});
})
</script>
</head>
<body>
输入用户名:<input type="text" id="userid">
<button id="go">进入</button>
选择发送人:<input type="text" id="toUserId">
发送的内容:<input type="text" id="contentText">
<button id="send">发送消息</button>
</body>
/**
* 开启WebSocket支持
*
*/
@Configuration
public class MyWebSocket {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3.再创建一个controller类用户接受用户登录以及发送消息
//使用@ServerEndpoint注解来设置哪个链接来处理websocket
@ServerEndpoint("/demo/{userId}")
@Component
public class WebSocketServer {
/**concurrent包的线程安全Set,用来存放每个客户端对应的MyWebSocket对象。*/
private static ConcurrentHashMap<String,WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
/**与某个客户端的连接会话,需要通过它来给客户端发送数据*/
private Session session;
/**接收userId*/
private String userId="";
/*** 连接建立成功调用的方法*/
@OnOpen
public void onOpen(Session session, @PathParam("userId") String userId) {
this.session = session;
this.userId=userId;
if(webSocketMap.containsKey(userId)){
webSocketMap.remove(userId);
webSocketMap.put(userId,this);
//加入set中
}else{
webSocketMap.put(userId,this);
//加入set中
}
System.out.println("用户连接:"+userId+"---"+session );
}
/**
* 收到客户端消息后调用的方法
*
* @param message 客户端发送过来的消息*/
@OnMessage
public void onMessage(String message, Session session) {
System.out.println("用户消息:"+userId+",报文:"+message);
//可以群发消息
//消息保存到数据库、redis
if(StringUtils.isNotBlank(message)){
try {
//将message转化json
JSONObject jsonObject = JSON.parseObject(message);
//追加发送人(防止串改)
jsonObject.put("fromUserId",this.userId);
String toUserId=jsonObject.getString("toUserId");
String all = jsonObject.getString("all");
if(all.equals("1")){
System.out.println("qunfa");
//ConcurrentHashMap<String,WebSocketServer> webSocketMap
for(Map.Entry<String,WebSocketServer> entry : webSocketMap.entrySet()){
//获取到所有map中的链接, 然后发送消息 并是用多线程
new Thread(new Runnable() {
@Override
public void run() {
try {
entry.getValue().sendMessage(jsonObject.toJSONString());
}catch (Exception e){
e.printStackTrace();
}
}
}).start();
}
}else{
//传送给对应toUserId用户的websocket
if(StringUtils.isNotBlank(toUserId)&&webSocketMap.containsKey(toUserId)){
System.out.println("向"+toUserId+"发送"+message);
webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
}else{
System.out.println("请求的userId:"+toUserId+"不在该服务器上");
//否则不在这个服务器上,发送到mysql或者redis
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 连接关闭调用的方法
* 前端浏览器关闭时
*/
@OnClose
public void onClose() {
if(webSocketMap.containsKey(userId)){
webSocketMap.remove(userId);
}
System.out.println("用户退出:"+userId);
}
/**
* 发送消息方法
*/
public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
}
}
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