1.添加pom依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
2.添加webSocket配置类
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3.WebSocket业务逻辑类
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;
@ServerEndpoint(value = "/webSocket/{userId}")
@Component
public class MyWebSocket {
static Logger log = Logger.getLogger(MyWebSocket.class);
// 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
private static int onlineCount = 0;
// 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 CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();
// 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 = "";
private static Map<String, MyWebSocket> webSocketMap = new HashMap<>();
/**
* 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;
webSocketSet.add(this);
if (webSocketMap.containsKey(userId)) {
webSocketMap.remove(userId);
webSocketMap.put(userId, this);
} else {
webSocketMap.put(userId, this);// 加入set中
addOnlineCount();// 在线数加1
}
log.info(userId + "加入");
log.info("当前在线人数为：" + getOnlineCount());
try {
sendMessage("欢迎" + userId + "加入");
} catch (IOException e) {
System.out.println("IO异常");
}
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
webSocketSet.remove(this); // 从set中删除
subOnlineCount(); // 在线数减1
System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
}
/**
* 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) {
message = "来自"+userId+"的消息:" + message;
log.info("onMessage:"+message);
// 群发消息
for (MyWebSocket item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 发生错误时调用
*
*/
@OnError
public void onError(Session session, Throwable error) {
System.out.println("发生错误");
error.printStackTrace();
}
public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
// this.session.getAsyncRemote().sendText(message);
}
/**
* 群发自定义消息
*/
public static void sendInfo(String message) throws IOException {
for (MyWebSocket item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
continue;
}
}
}
/**
* 发送自定义消息
* 按userid发送消息
*/
public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
log.info("发送消息到：" + userId + "，报文：" + message);
if (webSocketMap.containsKey(userId)) {
webSocketMap.get(userId).sendMessage(message);
} else {
log.error("用户" + userId + ",不在线！");
}
}
/**
* 获取在线客户端数量
*
* @return
*/
public static synchronized int getOnlineCount() {
return onlineCount;
}
/**
* 添加线上链接的客户端数量
*/
public static synchronized void addOnlineCount() {
MyWebSocket.onlineCount++;
}
/**
* 客户端下载是调用将在线数量减1
*/
public static synchronized void subOnlineCount() {
MyWebSocket.onlineCount--;
}
}
4.web测试代码
<!DOCTYPE HTML>
<html>
<head>
<title>My WebSocket</title>
</head>
<body>
Welcome<br/>
<input id="text" type="text" /><button onclick="send()">Send</button> <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>
<script type="text/javascript">
var websocket = null;
//判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
websocket = new WebSocket("ws://localhost:8888/websocket");
}
else{
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function(){
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event){
setMessageInnerHTML("open");
}
//接收到消息的回调方法
websocket.onmessage = function(event){
setMessageInnerHTML(event.data);
}
//连接关闭的回调方法
websocket.onclose = function(){
setMessageInnerHTML("close");
}
//监听窗口关闭事件，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();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML){
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket(){
websocket.close();
}
//发送消息
function send(){
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</html>
5.在接口调用MyWebsocket中的sendInfo方法发送消息到客户端
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.bean.UserInfo;
import com.example.demo.service.MyService;
import com.example.demo.websocket.MyWebSocket;
import com.google.gson.Gson;
@Controller
@RequestMapping(value = "/test")
public class MyController {
@Autowired
private MyService Service;
@ResponseBody
@RequestMapping(value = "/hello", method = RequestMethod.GET)
public String test() {
Gson gson = new Gson();
try {
MyWebSocket.sendInfo("大家好");//发送消息到clientsocket
} catch (IOException e) {
e.printStackTrace();
}
Map<String,Object> map = new HashMap<>();
map.put("result","Hello");
return gson.toJson(map);
}
}
6.实现效果
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