首先引入依赖
<!--websocket依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
WebSocketConfig
import com.cn.ih.java.main.module.chathistory.service.ChatHistoryService;
import com.cn.ih.java.main.module.websocket.WebSocketServer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
stompEndpointRegistry.addEndpoint("/endpointih").withSockJS();
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableSimpleBroker("/topic");
}
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
//如果需要在WebSocketServer里面调用注入的业务方法,则需要下面这行代码
// @Autowired
// public void setChatHistoryService(ChatHistoryService chatHistoryService){
// WebSocketServer.chatHistoryService=chatHistoryService;
// }
}
WebSocketServer
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.websocket.EncodeException;
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 com.cn.ih.java.main.module.chathistory.service.ChatHistoryService;
import com.cn.ih.java.main.utils.JsonHelper;
import com.cn.ih.java.main.utils.TimeHelper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import lombok.extern.slf4j.Slf4j;
/**
* 前端连接地址
* ws://ip:port/msgservice/api/pushMessage/{1}
*/
@Component
@Slf4j
@Lazy
@ServerEndpoint(value = "/api/pushMessage/{userId}")
public class WebSocketServer {
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
/**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WebSocket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 = "";
//对应config最后一行代码
//public static ChatHistoryService chatHistoryService;
/**
* 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);
//加入set中
webSocketMap.put(userId,this);
}else{
//加入set中
webSocketMap.put(userId,this);
//在线数加1
addOnlineCount();
}
logger.info("用户连接:"+userId+",当前在线人数为:" + getOnlineCount());
Map<String,Object> resMap=new HashMap<String,Object>();
resMap.put("message", "连接成功");
resMap.put("code", 200);
resMap.put("timestamp", TimeHelper.getCurrentTime());
try {
String result = JsonHelper.parserMap(resMap);
sendMessage(result);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
if(webSocketMap.containsKey(userId)){
webSocketMap.remove(userId);
//从set中删除
subOnlineCount();
}
logger.info("用户退出:"+userId+",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) {
logger.info("用户id:"+userId+",报文:"+message);
if(!StringUtils.isEmpty(message)){
try {
//解析发送的报文
com.alibaba.fastjson.JSONObject jsonObject = JSON.parseObject(message);
//追加发送人(防止串改)
jsonObject.put("fromUserId",this.userId);//发送者
String fromUserId= jsonObject.getString("fromUserId");//发送者
String toUserId= jsonObject.getString("toUserId");//接收者
//传送给对应toUserId用户的websocket
if(!StringUtils.isEmpty(toUserId)&&webSocketMap.containsKey(toUserId)){
//业务
Map<String,Object> resMap=new HashMap<String,Object>();
resMap.put("message", "发送消息成功");
resMap.put("code", 200);
resMap.put("data", jsonObject);
resMap.put("timestamp", TimeHelper.getCurrentTime());
String result = JsonHelper.parserMap(resMap);
webSocketMap.get(this.userId).sendMessage(result);//给发送者返回发送成功
webSocketMap.get(toUserId).sendMessage(result);//给接收者推送消息内容
}else{
//userId不存在
Map<String,Object> resMap=new HashMap<String,Object>();
resMap.put("message", "发送消息失败,请求的userId:"+toUserId+"不在该服务器上");
resMap.put("code", 400);
resMap.put("data", null);
resMap.put("timestamp", TimeHelper.getCurrentTime());
String result = JsonHelper.parserMap(resMap);
webSocketMap.get(this.userId).sendMessage(result);
}
}catch (Exception e){
e.printStackTrace();
}
}
}
/**
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
logger.error("用户错误:"+this.userId+",原因:"+error.getMessage());
error.printStackTrace();
}
/**
* 实现服务器主动推送
*/
public void sendMessage(String message) {
try {
logger.info("--------------websocket主动推送数据:{}",message);
synchronized(session){
this.session.getBasicRemote().sendText(message);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @description: 实现服务器主动推送实体消息
*/
public void sendObjectMessage(Object message) {
try {
this.session.getBasicRemote().sendObject(message);
} catch (IOException | EncodeException e) {
e.printStackTrace();
}
}
/**
*发送自定义消息
**/
public void sendInfo(String message, String userId) {
try {
logger.info("发送消息到:"+userId+",报文:"+message);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(!StringUtils.isEmpty(userId) && webSocketMap.containsKey(userId)){
webSocketMap.get(userId).sendMessage(message);
}else{
logger.info("用户"+userId+",不在线!");
}
}
/**
*发送广播消息
**/
public void sendAllInfo(String message) {
ConcurrentHashMap.KeySetView<String, WebSocketServer> keySet = webSocketMap.keySet();
for (String key:keySet){
try {
logger.info("发送消息到:"+key+",报文:"+message);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(!StringUtils.isEmpty(key) && webSocketMap.containsKey(key)){
webSocketMap.get(key).sendMessage(message);
}else{
logger.info("用户"+key+",不在线!");
}
}
}
/**
* 获得此时的在线人数
* @return
*/
public static synchronized int getOnlineCount() {
return onlineCount;
}
/**
* 在线人数加1
*/
public static synchronized void addOnlineCount() {
WebSocketServer.onlineCount++;
}
/**
* 在线人数减1
*/
public static synchronized void subOnlineCount() {
WebSocketServer.onlineCount--;
}
}
Postaman测试通信
file-new
选择WebSocket Request
输入服务器ip和端口号即可,如果是本地测试ip为127.0.0.1
点击右侧的
connect即可,compose里面是你要发送的报文,格式和WebSocketServer里的报文解析保持一致
只需要再创建一个和接收者相同id的请求即可实现相互通信,同理,可以创建多个通信请求
服务器实现主动推送消息给客户端
@ApiOperation(value = "服务器主动推送消息")
@RequestMapping(value="/sendMessage",method= RequestMethod.POST)
public void sendMessage() {
webSocketServer.sendInfo("aaa","10");//给指定用户推送消息
webSocketServer.sendAllInfo("bbb");//给所有在线用户推送消息
}