微信小程序websocket,后台SSM(SpringMVC+Spring+Mybatis)

微信小程序实现websocket步骤:
后台:

 1. 添加maven依赖
 2. 创建握手
 3. 创建处理器
 4. spring配置(xml配置或javabean方式配置任选一种)

微信小程序:

 1. 书写连接

java后台

1.添加maven依赖

    
    <dependency>
        <groupId>org.springframeworkgroupId>
        <artifactId>spring-websocketartifactId>
        <version>${spring.version}version>
    dependency>
    <dependency>
        <groupId>org.springframeworkgroupId>
        <artifactId>spring-messagingartifactId>
        <version>${spring.version}version>
    dependency>

    
    
    <spring.version>4.3.7.RELEASEspring.version>

2.创建握手

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;

/**
 * 此类用来获取登录用户信息并交由websocket管理
 */
public class MyWebSocketInterceptor implements HandshakeInterceptor {

    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse arg1, WebSocketHandler arg2,
            Map arg3) throws Exception {
        // 将ServerHttpRequest转换成request请求相关的类，用来获取request域中的用户信息
        if (request instanceof ServletServerHttpRequest) {
            ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
            HttpServletRequest httpRequest = servletRequest.getServletRequest();

        }

        System.out.println("连接到我了");

        return true;
    }

    @Override
    public void afterHandshake(ServerHttpRequest arg0, ServerHttpResponse arg1, WebSocketHandler arg2, Exception arg3) {
        // TODO Auto-generated method stub

    }

}

3.创建处理器

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 users = new ArrayList<>();

    // 用户进入系统监听
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("成功进入了系统。。。");
        users.add(session);

        sendMessagesToUsers(new TextMessage("今天晚上服务器维护,请注意"));
    }

    //
    @Override
    public void handleMessage(WebSocketSession session, WebSocketMessage message) throws Exception {
        // 将消息进行转化，因为是消息是json数据，可能里面包含了发送给某个人的信息，所以需要用json相关的工具类处理之后再封装成TextMessage，
        // 我这儿并没有做处理，消息的封装格式一般有{from:xxxx,to:xxxxx,msg:xxxxx}，来自哪里，发送给谁，什么消息等等
        // TextMessage msg = (TextMessage)message.getPayload();
        // 给所有用户群发消息
        //sendMessagesToUsers(msg);
        // 给指定用户群发消息
        //sendMessageToUser(userId, msg);

    }

    // 后台错误信息处理方法
    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {

    }

    // 用户退出后的处理，不如退出之后，要将用户信息从websocket的session中remove掉，这样用户就处于离线状态了，也不会占用系统资源
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
        if (session.isOpen()) {
            session.close();
        }
        users.remove(session);
        System.out.println("安全退出了系统");

    }

    @Override
    public boolean supportsPartialMessages() {
        return false;
    }

    /**
     * 给所有的用户发送消息
     */
    public void sendMessagesToUsers(TextMessage message) {
        for (WebSocketSession user : users) {
            try {
                // isOpen()在线就发送
                if (user.isOpen()) {
                    user.sendMessage(message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 发送消息给指定的用户
     */
    public void sendMessageToUser(String userId, TextMessage message) {
        for (WebSocketSession user : users) {
            if (user.getAttributes().get("").equals(userId)) {
                try {
                    // isOpen()在线就发送
                    if (user.isOpen()) {
                        user.sendMessage(message);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

4.spring配置

javabean方式配置(推荐)

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中配置扫描包

package="com.ahutshop.websocket" />

注意:
1. /webSocketServer.action之所以要加上.action的后缀,是因为web.xmlk中配置了拦截的后缀名为.action

<servlet>
    <servlet-name>DispatcherServletservlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    <init-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:springmvc.xmlparam-value>
    init-param>
    <load-on-startup>1load-on-startup>
    
    <async-supported>trueasync-supported>
servlet>
<servlet-mapping>
    <servlet-name>DispatcherServletservlet-name>
    <url-pattern>*.actionurl-pattern> 
servlet-mapping>

2 .setAllowedOrigins(“*”)中的*代表合法的请求域名,该方法接受一个可变数组作为参数,一定要配置,不然会请求时会出现403

xml方式配置(省略)

微信小程序

1.websocket.wxml

<view class="page">
  <view class="page__hd">
  view>
  <view class="page__bd">

  <button bindtap="connectWebsocket" type="primary">连接websocketbutton>

  view>
view>

2.websocket.js

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

  /**
   * 页面的初始数据
   */
  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连接已打开！')
    })
    wx.onSocketError(function (res) {
      console.log('WebSocket连接打开失败，请检查！')
    })
    wx.onSocketMessage(function (res) {
      console.log('收到服务器内容：' + res.data)
    })
  }
})

运行效果