ADD file via upload

UserService.java

@@ -0,0 +1,28 @@
+package mxdx1;
+
+public class UserService {
+    private ServiceInfo serviceInfo;
+    private ServiceRegistry registry;
+
+    public UserService(String host, int port) {
+        this.serviceInfo = new ServiceInfo("user-service", host, port);
+        this.registry = ServiceRegistry.getInstance();
+    }
+
+    // 启动服务并注册
+    public void start() {
+        System.out.println("User service started at " + serviceInfo.getHost() + ":" + serviceInfo.getPort());
+        registry.register(serviceInfo);
+    }
+
+    // 停止服务并注销
+    public void stop() {
+        System.out.println("User service stopped");
+        registry.unregister(serviceInfo);
+    }
+
+    // 业务方法
+    public String getUserInfo(String userId) {
+        return "User info for " + userId + " from " + serviceInfo.getHost() + ":" + serviceInfo.getPort();
+    }
+}