增加 spring websocket 用例

spring/spring-websocket-annotation/src/main/java/com/heibaiying/websocket/CustomHandshakeInterceptor.java

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+package com.heibaiying.websocket;
+
+import org.springframework.http.server.ServerHttpRequest;
+import org.springframework.http.server.ServerHttpResponse;
+import org.springframework.web.socket.WebSocketHandler;
+import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.util.Map;
+
+/**
+ * @author : heibaiying
+ * @description : 可以按照需求实现权限拦截等功能
+ */
+public class CustomHandshakeInterceptor extends HttpSessionHandshakeInterceptor {
+
+    @Override
+    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
+        InetSocketAddress remoteAddress = request.getRemoteAddress();
+        InetAddress address = remoteAddress.getAddress();
+        System.out.println(address);
+        /*
+         * 最后需要要显示调用父类方法，父类的beforeHandshake方法
+         * 把ServerHttpRequest 中session中对应的值拷贝到WebSocketSession中。
+         * 如果我们没有实现这个方法，我们在最后的handler处理中 是拿不到 session中的值
+         * 作为测试 可以注释掉下面这一行 可以发现自定义处理器中session的username总是为空
+         */
+        return super.beforeHandshake(request, response, wsHandler, attributes);
+    }
+}
+

spring/spring-websocket-annotation/src/main/java/com/heibaiying/websocket/CustomerHandler.java

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+package com.heibaiying.websocket;
+
+import com.heibaiying.constant.Constant;
+import org.springframework.web.socket.CloseStatus;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.handler.TextWebSocketHandler;
+
+import java.io.IOException;
+import java.net.URLDecoder;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * @author : heibaiying
+ * @description : 自定义消息处理类
+ */
+public class CustomerHandler extends TextWebSocketHandler {
+
+    private Map<String, WebSocketSession> nameAndSession = new ConcurrentHashMap<>();
+
+    // 建立连接时候触发
+    @Override
+    public void afterConnectionEstablished(WebSocketSession session)  {
+        String username = getNameFromSession(session);
+        nameAndSession.putIfAbsent(username, session);
+    }
+
+
+    // 关闭连接时候触发
+    @Override
+    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) {
+        String username = getNameFromSession(session);
+        nameAndSession.remove(username);
+    }
+
+    // 处理消息
+    @Override
+    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
+        // 防止中文乱码
+        String msg = URLDecoder.decode(message.getPayload(), "utf-8");
+        String username = getNameFromSession(session);
+        // 简单模拟群发消息
+        TextMessage reply = new TextMessage(username + " : " + msg);
+        nameAndSession.forEach((s, webSocketSession)
+                -> {
+            try {
+                webSocketSession.sendMessage(reply);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+    }
+
+
+    private String getNameFromSession(WebSocketSession session) {
+        Map<String, Object> attributes = session.getAttributes();
+        return (String) attributes.get(Constant.USER_NAME);
+    }
+}

spring/spring-websocket-annotation/src/main/java/com/heibaiying/websocket/WebSocketConfig.java

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+package com.heibaiying.websocket;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.socket.config.annotation.EnableWebSocket;
+import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
+import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
+
+/**
+ * @author : 罗祥
+ * @description :websocket 配置
+ * @date :create in 2018/12/27
+ */
+@Configuration
+@EnableWebSocket
+public class WebSocketConfig implements WebSocketConfigurer {
+
+    @Override
+    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
+        registry.addHandler(new CustomerHandler(), "/socket").addInterceptors(new CustomHandshakeInterceptor());
+    }
+}