微信小程序 websocket 实现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

 <!-- 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版本一定要为4以上版本 -->
  <spring.version>4.3.7.release</spring.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<string, object> 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<websocketsession> 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
<!-- 扫描包 -->
<context:component-scan base-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

<!-- springmvc模块 -->
<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>
  <!-- 支持异步 -->
  <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

<!--pages/websocket/websocket.wxml-->
<view class="page">
 <view class="page__hd">
 </view>
 <view class="page__bd">

 <button bindtap="connectwebsocket" type="primary">连接websocket</button>

 </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

以上就是微信小程序 后台的建立，如有疑问请留言或者到本站社区交流讨论，本站关于微信小程序的文章还有很多，希望大家多多搜索查阅，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！