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微信小程序實現websocket步驟:

後台:

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

微信小程序:

 1. 書寫連接

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.創建握手

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;

/**
 * 此類用來獲取登錄用戶信息並交由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

  }

}

3.創建處理器

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<>();

  // 用戶進入系統監聽
  @Override
  public void afterConnectionEstablished(WebSocketSession session) throws Exception {
    System.out.println("成功進入了系統。。。");
    users.add(session);

    sendMessagesToUsers(new TextMessage("今天晚上服務器維護,請注意"));
  }

  //
  @Override
  public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
    // 將消息進行轉化，因為是消息是json數據，可能裡面包含了發送給某個人的信息，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，消息的封裝格式一般有{from:xxxx,to:xxxxx,msg:xxxxx}，來自哪裡，發送給誰，什麼消息等等
    // TextMessage msg = (TextMessage)message.getPayload();
    // 給所有用戶群發消息
    //sendMessagesToUsers(msg);
    // 給指定用戶群發消息
    //sendMessageToUser(userId, msg);

  }

  // 後台錯誤信息處理方法
  @Override
  public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {

  }

  // 用戶退出後的處理，不如退出之後，要將用戶信息從websocket的session中remove掉，這樣用戶就處於離線狀態了，也不會占用系統資源
  @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;
  }

  /**
   * 給所有的用戶發送消息
   */
  public void sendMessagesToUsers(TextMessage message) {
    for (WebSocketSession user : users) {
      try {
        // isOpen()在線就發送
        if (user.isOpen()) {
          user.sendMessage(message);
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  /**
   * 發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
@EnableWebSocket
public 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的後綴,是因為web.xmlk中配置了攔截的後綴名為.action

<!-- 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>

2 .setAllowedOrigins(“*”)中的*代表合法的請求域名,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)

微信小程序

1.websocket.wxml

<!--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>

2.websocket.js

// pages/websocket/websocket.js
Page({

 /**
  * 頁面的初始數據
  */
 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('收到服務器內容：' + res.data)
  })
 }
})

運行效果

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