1. postman v8.5版本 以上支持 websocket。
2. 选择websocket请求模块
File - New...
3. WebSocketServer.java
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* 访问: ws://localhost:8080/ws/{userId}
*/
@Component
@ServerEndpoint("/ws/{userId}")
public class WebSocketServer {
private static int onlineCount = 0;
private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<>();
private Session session;
private String userId = "";
@OnOpen
public void onOpen(Session session, @PathParam("userId") String userId) {
this.session = session;
webSocketSet.add(this); //加入set中
addOnlineCount(); //在线数加1
this.userId = userId;
sendMessage(userId + "用户" + ", 连接成功 !");
System.out.println("【websocket】" + userId + "用户" + "已连接!当前在线人数为" + getOnlineCount());
}
@OnClose
public void onClose() {
webSocketSet.remove(this); //从set中删除
subOnlineCount(); //在线数减1
System.out.println("【websocket】" + userId + "用户" + "已关闭!当前在线人数为" + getOnlineCount());
}
@OnMessage
public void onMessage(String message, Session session) {
if(message.startsWith("target-")){
int index = message.indexOf(":");
String userId = message.substring(7,index);
sendInfo(message.substring(index + 1), userId);
return;
}
this.session = session;
sendMessage("【websocket】 服务端收到来自窗口" + userId + "发送的消息:" + message);
}
@OnError
public void onError(Session session, Throwable error) {
this.session = session;
error.printStackTrace();
}
private void sendMessage(String message) {
try {
this.session.getBasicRemote().sendText(message);
} catch (IOException e) {
e.printStackTrace();
}
}
// 群发消息
/**
* 群发自定义消息
*/
public static void sendInfo(@PathParam("userId") String userId, String message) {
System.out.println("【websocket】 推送消息给" + userId + "用户" + ",推送内容:" + message);
for (WebSocketServer item : webSocketSet) {
//这里可以设定只推送给这个userId的,为null则全部推送
if (userId == null) {
// item.sendMessage(message);
} else if (item.userId.equals(userId)) {
item.sendMessage(message);
}
}
}
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;
}
}
4. postman请求, ws:// 开头
ws://localhost:8080/ws/{userId}
⬆️ 是发送的信息, ⬇️ 是接收到的信息
userId: 101用户连接
userId: 102用户连接
userId: 101用户给102用户发消息
userId: 102用户给101用户发消息
文章来源:https://www.toymoban.com/news/detail-740237.html
文章来源地址https://www.toymoban.com/news/detail-740237.html
控制台输出:
2023-09-12 21:59:37.038 INFO 5172 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-09-12 21:59:37.038 INFO 5172 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2023-09-12 21:59:37.039 INFO 5172 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
【websocket】101用户已连接!当前在线人数为1
【websocket】102用户已连接!当前在线人数为2
【websocket】 推送消息到给102用户,推送内容:你好, 很高兴认识你; 我是101用户
【websocket】 推送消息到给101用户,推送内容:你好, 我也很高兴认识你; 我是102用户
postman v8.5.1版本下载
链接: https://pan.baidu.com/s/1CaXKkIFLyluLJd3KNdSlaw
提取码: dhj5
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