①pom.xml添加
<!--websocket -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
②添加WebSocketConfig类，开启WebSocket支持
package com.danyu.framework.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
/**
* 开启WebSocket支持
* Created by danyu on 2019/12/26.
*/
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
③添加DemoWebsocketController控制器类
package com.demo.project.websocket.controller;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.stereotype.Controller;
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.ResponseBody;
import com.demo.project.websocket.server.WebSocketServer;
import com.ruoyi.framework.web.controller.BaseController;
/**
*
*
* @author danyu
* @date 2019-09-30
*/
@Controller
@RequestMapping("/demo/websocket")
public class DemoWebsocketController extends BaseController
{
private String prefix = "demo/websocket";
@RequiresPermissions("demo:websocket:view")
@GetMapping()
public String socket()
{
return prefix + "/websocket";
}
@RequiresPermissions("demo:websocket:edit")
//推送数据接口
@ResponseBody
@RequestMapping("/push/{cid}")
public Map pushToWeb(@PathVariable String cid, String message) {
if(message==null){
message = "我是消息44";
}
Map result = new HashMap();
try {
WebSocketServer.sendInfo(message,cid);
result.put("code", 200);
result.put("msg", "success");
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
}
④添加WebSocketServer类
package com.demo.project.websocket.server;
import java.io.IOException;
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.springframework.stereotype.Component;
import lombok.extern.slf4j.Slf4j;
@ServerEndpoint("/WebSocketServer/{sid}")
@Component
@Slf4j
public class WebSocketServer {
// 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<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
//private static ConcurrentHashMap<String,WebSocketServer> websocketList = 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sid
private String sid = "";
// * 连接建立成功调用的方法*
@OnOpen
public void onOpen(Session session, @PathParam("sid") String sid) {
this.session = session;
webSocketSet.add(this); // 加入set中
addOnlineCount(); // 在线数加1
log.info("有新窗口开始监听:" + sid + ",当前在线人数为" + getOnlineCount());
this.sid = sid;
try {
sendMessage("连接成功");
} catch (IOException e) {
log.error("websocket 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
log.info("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) {
log.info("收到来自窗口" + sid + "的信息:" + message);
// 群发消息
for (WebSocketServer item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
*
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.error("发生错误");
error.printStackTrace();
}
/**
* 实现服务器主动推送
*/
public void sendMessage(String message) throws IOException {
log.info("服务器消息推送："+message);
this.session.getBasicRemote().sendText(message);
}
/**
* 群发自定义消息
*/
public static void sendInfo(String message, @PathParam("sid") String sid) throws IOException {
log.info("推送消息到窗口" + sid + "，推送内容:" + message);
for (WebSocketServer item : webSocketSet) {
try {
// 这里可以设定只推送给这个sid的，为null则全部推送
if (sid == null) {
item.sendMessage(message);
} else if (item.sid.equals(sid)) {
item.sendMessage(message);
}
} catch (IOException e) {
continue;
}
}
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
WebSocketServer.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSocketServer.onlineCount--;
}
public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
return webSocketSet;
}
}
⑤添加websocket.html。路径：resources/templates/demo/websocket
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"></meta>
<title>Title</title>
<script type="text/javascript" src="/js/jquery.min.js"></script>
</head>
<body>
hello world!
<button onclick="onSendButtonClick()">发送</button>
<button onclick="onJhButtonClick()">交互</button>
</body>
<script>
var index;
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");
index = new WebSocket("ws://localhost:8888/WebSocketServer/2");
//打开事件
index.onopen = function() {
console.log("Socket 已打开");
//index.send("这是来自客户端的消息" + location.href + new Date());
};
//获得消息事件
index.onmessage = function(msg) {
console.log("获得消息："+msg.data);
//发现消息进入 开始处理前端触发逻辑
};
//关闭事件
index.onclose = function() {
console.log("Socket已关闭");
};
//发生了错误事件
index.onerror = function() {
alert("Socket发生了错误");
//此时可以尝试刷新页面
}
}
function onSendButtonClick(){
console.log("开始发送");
index.send("这是来自客户端的消息" + location.href + new Date());
}
function onJhButtonClick(){
$.ajax({
url: "/demo/websocket/push/2",
data: {"message":"我是消息"},
type: "post",
processData: false,
contentType: false,
success: function(result) {
console.log(result);
alert(result);
}
})
}
</script>
</html>