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
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