微信小程式 websocket 實現SpringMVC+Spring+Mybatis，websocketspringmvc

小程式 websocket 實現SpringMVC+Spring+Mybatis，websocketspringmvc

小程式實現websocket步驟:

後台:

 1. 添加maven依賴 2. 建立握手 3. 建立處理器 4. spring配置(xml配置或javabean方式配置任選一種)

小程式:

 1. 書寫串連

java後台

1.添加maven依賴

 <!-- 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>

2.建立握手

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;/** * 此類用來擷取登入使用者資訊並交由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轉換成request請求相關的類，用來擷取request域中的使用者資訊    if (request instanceof ServletServerHttpRequest) {      ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;      HttpServletRequest httpRequest = servletRequest.getServletRequest();    }    System.out.println("串連到我了");    return true;  }  @Override  public void afterHandshake(ServerHttpRequest arg0, ServerHttpResponse arg1, WebSocketHandler arg2, Exception arg3) {    // TODO Auto-generated method stub  }}

3.建立處理器

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<>();  // 使用者進入系統監聽  @Override  public void afterConnectionEstablished(WebSocketSession session) throws Exception {    System.out.println("成功進入了系統。。。");    users.add(session);    sendMessagesToUsers(new TextMessage("今天晚上伺服器維護,請注意"));  }  //  @Override  public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {    // 將訊息進行轉化，因為是訊息是json資料，可能裡麵包含了發送給某個人的資訊，所以需要用json相關的工具類處理之後再封裝成TextMessage，    // 我這兒並沒有做處理，訊息的封裝格式一般有{from:xxxx,to:xxxxx,msg:xxxxx}，來自哪裡，發送給誰，什麼訊息等等    // TextMessage msg = (TextMessage)message.getPayload();    // 給所有使用者群發訊息    //sendMessagesToUsers(msg);    // 給指定使用者群發訊息    //sendMessageToUser(userId, msg);  }  // 後台錯誤資訊處理方法  @Override  public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {  }  // 使用者退出後的處理，不如退出之後，要將使用者資訊從websocket的session中remove掉，這樣使用者就處於離線狀態了，也不會佔用系統資源  @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");  }  @Override  public boolean supportsPartialMessages() {    return false;  }  /**   * 給所有的使用者發送訊息   */  public void sendMessagesToUsers(TextMessage message) {    for (WebSocketSession user : users) {      try {        // isOpen()線上就發送        if (user.isOpen()) {          user.sendMessage(message);        }      } catch (IOException e) {        e.printStackTrace();      }    }  }  /**   * 發送訊息給指定的使用者   */  public void sendMessageToUser(String userId, TextMessage message) {    for (WebSocketSession user : users) {      if (user.getAttributes().get("").equals(userId)) {        try {          // isOpen()線上就發送          if (user.isOpen()) {            user.sendMessage(message);          }        } catch (IOException e) {          e.printStackTrace();        }      }    }  }}

4.spring配置

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" />

注意:

1. /webSocketServer.action之所以要加上.action的尾碼,是因為web.xmlk中配置了攔截的尾碼名為.action

<!-- springmvc模組 --><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>  <!-- 支援非同步 -->  <async-supported>true</async-supported></servlet><servlet-mapping>  <servlet-name>DispatcherServlet</servlet-name>  <url-pattern>*.action</url-pattern> </servlet-mapping>

2 .setAllowedOrigins(“*”)中的*代表合法的請求網域名稱,該方法接受一個可變數組作為參數,一定要配置,不然會請求時會出現403

xml方式配置(省略)

小程式

1.websocket.wxml

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

2.websocket.js

// pages/websocket/websocket.jsPage({ /**  * 頁面的初始資料  */ 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串連已開啟！')  })  wx.onSocketError(function (res) {   console.log('WebSocket串連開啟失敗，請檢查！')  })  wx.onSocketMessage(function (res) {   console.log('收到伺服器內容：' + res.data)  }) }})

運行效果

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