1. 添加maven依賴 2. 創(chuàng)建握手 3. 創(chuàng)建處理器 4. spring配置(xml配置或javabean方式配置任選一種)

 1. 書寫連接

 <!-- websocket -->  <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-websocket</artifactId>    <version>${spring.version}</version>  </dependency>  <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-messaging</artifactId>    <version>${spring.version}</version>  </dependency>  <!-- 其中spring版本 -->  <!-- 注意spring版本一定要為4以上版本 -->  <spring.version>4.3.7.RELEASE</spring.version>

package com.ahutshop.websocket;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.springframework.http.server.ServerHttpRequest;import org.springframework.http.server.ServerHttpResponse;import org.springframework.http.server.ServletServerHttpRequest;import org.springframework.web.socket.WebSocketHandler;import org.springframework.web.socket.server.HandshakeInterceptor;/** * 此類用來獲取登錄用戶信息并交由websocket管理 */public class MyWebSocketInterceptor implements HandshakeInterceptor {  @Override  public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse arg1, WebSocketHandler arg2,      Map<String, Object> arg3) throws Exception {    // 將ServerHttpRequest轉(zhuǎn)換成request請求相關(guān)的類，用來獲取request域中的用戶信息    if (request instanceof ServletServerHttpRequest) {      ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;      HttpServletRequest httpRequest = servletRequest.getServletRequest();    }    System.out.println("連接到我了");    return true;  }  @Override  public void afterHandshake(ServerHttpRequest arg0, ServerHttpResponse arg1, WebSocketHandler arg2, Exception arg3) {    // TODO Auto-generated method stub  }}

package com.ahutshop.websocket;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.springframework.web.socket.CloseStatus;import org.springframework.web.socket.TextMessage;import org.springframework.web.socket.WebSocketHandler;import org.springframework.web.socket.WebSocketMessage;import org.springframework.web.socket.WebSocketSession;public class WebSocketPushHandler implements WebSocketHandler {  private static final List<WebSocketSession> users = new ArrayList<>();  // 用戶進入系統(tǒng)監(jiān)聽  @Override  public void afterConnectionEstablished(WebSocketSession session) throws Exception {    System.out.println("成功進入了系統(tǒng)。。。");    users.add(session);    sendMessagesToUsers(new TextMessage("今天晚上服務器維護,請注意"));  }  //  @Override  public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {    // 將消息進行轉(zhuǎn)化，因為是消息是json數(shù)據(jù)，可能里面包含了發(fā)送給某個人的信息，所以需要用json相關(guān)的工具類處理之后再封裝成TextMessage，    // 我這兒并沒有做處理，消息的封裝格式一般有{from:xxxx,to:xxxxx,msg:xxxxx}，來自哪里，發(fā)送給誰，什么消息等等    // TextMessage msg = (TextMessage)message.getPayload();    // 給所有用戶群發(fā)消息    //sendMessagesToUsers(msg);    // 給指定用戶群發(fā)消息    //sendMessageToUser(userId, msg);  }  // 后臺錯誤信息處理方法  @Override  public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {  }  // 用戶退出后的處理，不如退出之后，要將用戶信息從websocket的session中remove掉，這樣用戶就處于離線狀態(tài)了，也不會占用系統(tǒng)資源  @Override  public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {    if (session.isOpen()) {      session.close();    }    users.remove(session);    System.out.println("安全退出了系統(tǒng)");  }  @Override  public boolean supportsPartialMessages() {    return false;  }  /**   * 給所有的用戶發(fā)送消息   */  public void sendMessagesToUsers(TextMessage message) {    for (WebSocketSession user : users) {      try {        // isOpen()在線就發(fā)送        if (user.isOpen()) {          user.sendMessage(message);        }      } catch (IOException e) {        e.printStackTrace();      }    }  }  /**   * 發(fā)送消息給指定的用戶   */  public void sendMessageToUser(String userId, TextMessage message) {    for (WebSocketSession user : users) {      if (user.getAttributes().get("").equals(userId)) {        try {          // isOpen()在線就發(fā)送          if (user.isOpen()) {            user.sendMessage(message);          }        } catch (IOException e) {          e.printStackTrace();        }      }    }  }}

javabean方式配置(推薦)package com.ahutshop.websocket;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.socket.WebSocketHandler;import org.springframework.web.socket.config.annotation.EnableWebSocket;import org.springframework.web.socket.config.annotation.WebSocketConfigurer;import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;@Configuration@EnableWebSocketpublic class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer {  @Override  public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {    registry.addHandler(WebSocketPushHandler(), "/webSocketServer.action").addInterceptors(new MyWebSocketInterceptor()).setAllowedOrigins("*");    registry.addHandler(WebSocketPushHandler(), "/sockjs/webSocketServer.action")        .addInterceptors(new MyWebSocketInterceptor()).withSockJS();  }  @Bean  public WebSocketHandler WebSocketPushHandler() {    return new WebSocketPushHandler();  }}spring.xml中配置掃描包<!-- 掃描包 --><context:component-scan base-package="com.ahutshop.websocket" />

<!-- springmvc模塊 --><servlet>  <servlet-name>DispatcherServlet</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <init-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:springmvc.xml</param-value>  </init-param>  <load-on-startup>1</load-on-startup>  <!-- 支持異步 -->  <async-supported>true</async-supported></servlet><servlet-mapping>  <servlet-name>DispatcherServlet</servlet-name>  <url-pattern>*.action</url-pattern> </servlet-mapping>

<!--pages/websocket/websocket.wxml--><view class="page"> <view class="page__hd"> </view> <view class="page__bd"> <button bindtap="connectWebsocket" type="primary">連接websocket</button> </view></view>

// pages/websocket/websocket.jsPage({ /**  * 頁面的初始數(shù)據(jù)  */ data: { }, connectWebsocket: function () {  wx.connectSocket({   url: 'ws://localhost:8080/AhutShop/webSocketServer.action',   data: {   },   header: {    'content-type': 'application/json'   },   method: "GET"  })  wx.onSocketOpen(function (res) {   console.log('WebSocket連接已打開！')  })  wx.onSocketError(function (res) {   console.log('WebSocket連接打開失敗，請檢查！')  })  wx.onSocketMessage(function (res) {   console.log('收到服務器內(nèi)容：' + res.data)  }) }})