增加websocket 旨在服务端主动向客户端推送数据，实现系统向在线用户推送消息，可群发，可对指定用户发送
集成步骤
1、添加依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency>
2、添加配置类
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketConfig {
/**
* 注入ServerEndpointExporter，
* 这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
*/
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3、WebSocket操作类
通过该类WebSocket可以进行群推送以及单点推送
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.websocket.OnClose;
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;
@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")
public class WebSocket {
private Session session;
private static CopyOnWriteArraySet<WebSocket> webSockets =new CopyOnWriteArraySet<>();
private static Map<String,Session> sessionPool = new HashMap<String,Session>();
@OnOpen
public void onOpen(Session session, @PathParam(value="userId")String userId) {
try {
this.session = session;
webSockets.add(this);
sessionPool.put(userId, session);
log.info("【websocket消息】有新的连接，总数为:"+webSockets.size());
} catch (Exception e) {
}
}
@OnClose
public void onClose() {
try {
webSockets.remove(this);
log.info("【websocket消息】连接断开，总数为:"+webSockets.size());
} catch (Exception e) {
}
}
@OnMessage
public void onMessage(String message) {
log.info("【websocket消息】收到客户端消息:"+message);
}
// 此为广播消息
public void sendAllMessage(String message) {
log.info("【websocket消息】广播消息:"+message);
for(WebSocket webSocket : webSockets) {
try {
if(webSocket.session.isOpen()) {
webSocket.session.getAsyncRemote().sendText(message);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 此为单点消息
public void sendOneMessage(String userId, String message) {
Session session = sessionPool.get(userId);
if (session != null&&session.isOpen()) {
try {
log.info("【websocket消息】 单点消息:"+message);
session.getAsyncRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 此为单点消息(多人)
public void sendMoreMessage(String[] userIds, String message) {
for(String userId:userIds) {
Session session = sessionPool.get(userId);
if (session != null&&session.isOpen()) {
try {
log.info("【websocket消息】 单点消息:"+message);
session.getAsyncRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
4、前端VUE中使用WebSocket
<script>
import store from '@/store/'
export default {
data() {
return {
}
},
mounted() {
//初始化websocket
this.initWebSocket()
},
destroyed: function () { // 离开页面生命周期函数
this.websocketclose();
},
methods: {
initWebSocket: function () {
// WebSocket与普通的请求所用协议有所不同，ws等同于http，wss等同于https
var userId = store.getters.userInfo.id;
var url = window._CONFIG['domianURL'].replace("https://","ws://").replace("http://","ws://")+"/websocket/"+userId;
this.websock = new WebSocket(url);
this.websock.onopen = this.websocketonopen;
this.websock.onerror = this.websocketonerror;
this.websock.onmessage = this.websocketonmessage;
this.websock.onclose = this.websocketclose;
},
websocketonopen: function () {
console.log("WebSocket连接成功");
},
websocketonerror: function (e) {
console.log("WebSocket连接发生错误");
},
websocketonmessage: function (e) {
var data = eval("(" + e.data + ")");
//处理订阅信息
if(data.cmd == "topic"){
//TODO 系统通知
}else if(data.cmd == "user"){
//TODO 用户消息
}
},
websocketclose: function (e) {
console.log("connection closed (" + e.code + ")");
}
}
}
</script>
5、WebSocket业务对接
//系统通告业务对接示例
//系统通告管理中，管理员可发两种类型的消息，全体用户和指定用户发送
//发送的消息是一个json串
//（1）调用WebSocket 服务
@Resource
private WebSocket webSocket;
//（2）方法中调用
//全体发送
//创建业务消息信息
JSONObject obj = new JSONObject();
obj.put("cmd", "topic");//业务类型
obj.put("msgId", sysAnnouncement.getId());//消息id
obj.put("msgTxt", sysAnnouncement.getTitile());//消息内容//全体发送
webSocket.sendAllMessage(obj.toJSONString());
//单个用户发送
//创建业务消息信息
JSONObject obj = new JSONObject();
obj.put("cmd", "user");//业务类型
obj.put("msgId", sysAnnouncement.getId());//消息id
obj.put("msgTxt", sysAnnouncement.getTitile());//消息内容//单个用户发送 (userId为用户id)
webSocket.sendOneMessage(userId, obj.toJSONString());
//多个用户发送
//创建业务消息信息
JSONObject obj = new JSONObject();
obj.put("cmd", "user");//业务类型
obj.put("msgId", sysAnnouncement.getId());//消息id
obj.put("msgTxt", sysAnnouncement.getTitile());//消息内容
//多个用户发送 (userIds为多个用户id，逗号‘,’分隔)
webSocket.sendMoreMessage(userIds, obj.toJSONString());
//（3）vue 客户端根据返回的cmd类型处理不同的业务响应
websocketonmessage: function (e) {
console.log("-----接收消息-------",e.data);
var data = eval("(" + e.data + ")");
//解析json对象
if(data.cmd == "topic"){
//TODO 系统通知
}else if(data.cmd == "user"){
//TODO 用户消息
}
},