SSM使用WebSocket实时推送消息

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_36476972/article/details/80111487

以前的消息推送用的是轮询，觉得太耗资源了，决定换成WebSocket，百度了很多配置都是做的聊天室，我这里只是推送消息，又是看帖子，又是看文档的，终于配置完成。Spring4.1.9文档
搜索websocket里边有demo
环境信息 ：
JDK :1.8.0_131
Tomcat : 8.5
Mysql : 5.6
Spring : 4.1.9.RELEASE
Mybatis : 3.2.7
spring-mybatis : 1.3.1
mysql-connector-java : 5.1.38
commons-dbcp : 1.4
json-lib : 2.4
log4j：1.2.17
slf4j-api：1.7.21
slf4j-log4j12：1.7.21
包太多 我就挑有用的贴上就好了 项目是SSM的这些基本是都有的
首先导入jar包，maven如下：

    <!-- WebSocket -->  
     <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-websocket</artifactId>  
        <version>4.1.9.RELEASE</version>  
     </dependency>  


     <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-messaging</artifactId>  
        <version>4.1.9.RELEASE</version>  
     </dependency> 

新建socket包 . 代码写的不好，辣眼睛不要介意。
创建SocketService信息处理类 SocketHandler.java

package com.ys.socket;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Service;
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;

import com.ys.entity.User;

/** 
*@Title SocketHandler.java 
*@description:  Socket请求处理 SocketService
*@time 创建时间：2018年4月25日 下午6:16:51 
**/
@Service
public class SocketHandler implements WebSocketHandler{

    private final static Logger log=Logger.getLogger(SocketHandler.class);
    private final static Map<String,WebSocketSession> userMap;
    //在线用户
    static {  
        userMap = new HashMap<String,WebSocketSession>();  
    }

    /**
     * 关闭连接后
     */
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        log.info("Websocket："+session.getId()+"已经关闭！");
        String userId=this.getUserId(session);
        if(userMap.get(userId) != null){
            userMap.remove(userId);
            log.info("Websocket："+userId+"用户已经移除！");
        }
    }

    /**
     * 连接成功后
     */
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        String userId=this.getUserId(session);
        if(userMap.get(userId) == null){
            userMap.put(userId, session);
            log.info("Websocket："+userId+"用户建立连接成功！");
        }else{
            log.info("Websocket："+userId+"用户已经连接！");
        }
    }


    /**
     * 发送信息时， 调用此方法传输数据
     */
    @Override
    public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
        session.sendMessage(message);  
        log.info("Websocket：handleMessage send message："+message);
    }


    /**
     * 发送异常时，调用此方法
     */
    @Override
    public void handleTransportError(WebSocketSession session, Throwable error) throws Exception {
        log.error("Websocket：handleMessage send message："+error);
    }


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


    /**
     * @Title: sendMessageToUser 
     * @Description: 给某个用户发送信息
     * @param @param user_id
     * @param @param message
     * @return void
     * @date createTime：2018年4月26日上午9:44:16
     */
    public void sendMessageToUser(String user_id, TextMessage message) {
        WebSocketSession session = userMap.get(user_id);  
        if(session !=null && session.isOpen()) {  
            try {  
                session.sendMessage(message);  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }
    }


    /**
     * @Title: sendMessageToUsers 
     * @Description: 给所有用户发送信息
     * @param @param message
     * @return void
     * @date createTime：2018年4月26日上午9:44:33
     */
    public void sendMessageToUsers(TextMessage message) {
        Set<String> userIds = userMap.keySet();  
        for(String userId: userIds) {  
            this.sendMessageToUser(userId, message);  
        }  
    }



    /**
     * @Title: getUserId 
     * @Description: 获取用户id
     * @param @param session
     * @param @return
     * @return String
     * @date createTime：2018年4月26日上午9:44:59
     */
    public String getUserId(WebSocketSession session){  
        try {  
            return String.valueOf(((User)session.getAttributes().get("user")).getUser_id());
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;  
    } 


}

userMap存放的是在线用户的信息，当用户下线就从userMap里踢出去。

接着是配置类 WebSocketConfig.java

package com.ys.socket;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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;
import org.springframework.web.socket.server.standard.ServletServerContainerFactoryBean;
import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor;


/** 
*@Title WebSocketConfig.java 
*@description:  websocket配置
*@time 创建时间：2018年4月26日 上午9:12:44 
**/
@Configuration
@EnableWebMvc
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer{


    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(SocketHandler(), "/socketServer").addInterceptors(new HttpSessionHandshakeInterceptor());  
        registry.addHandler(SocketHandler(), "/sockjs/socketServer").addInterceptors(new HttpSessionHandshakeInterceptor()).withSockJS(); 
    }


    @Bean
    public WebSocketHandler SocketHandler(){
        return new SocketHandler();
    }


    /**
     * @Title: createWebSocketContainer 
     * @Description: 配置webSocket引擎    用于tomcat 可以不配置
     * @param @return
     * @return ServletServerContainerFactoryBean
     * @date createTime：2018年4月26日上午11:18:28
     */
    @Bean
    public ServletServerContainerFactoryBean createWebSocketContainer() {
        ServletServerContainerFactoryBean container = new ServletServerContainerFactoryBean();
        container.setMaxTextMessageBufferSize(8192);
        container.setMaxBinaryMessageBufferSize(8192);
        return container;
    }

}

配置WebSocket拦截器 WebSocketInterceptor.java

package com.ys.socket;

import java.util.Map;

import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
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;

import com.ys.entity.User;

/** 
*@Title WebSocketInterceptor.java 
*@description:  WebSocket 适配器 拦截器
*@time 创建时间：2018年4月26日 上午9:16:09 
**/
public class WebSocketInterceptor implements HandshakeInterceptor{

    private final static Logger log=Logger.getLogger(WebSocketInterceptor.class);

    @Override
    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler, Exception exceptions) {
        log.info("=================执行 afterHandshake ：handler: "+handler+"exceptions: "+exceptions);
    }


    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler,
            Map<String, Object> map) throws Exception {
        log.info("==================执行 beforeHandshake ：handler: "+handler+"map: "+map.values());
        if(request instanceof ServerHttpRequest){
            ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
            HttpSession session = servletRequest.getServletRequest().getSession();
            if(session!=null){
                User user=(User)session.getAttribute("user");
                map.put(String.valueOf(user.getUser_id()), user);
            }
        }
        return true;
    }

}

我这里是登录成功直接连接WebSocket 把用户信息放进去

controller

/**
     * 验证登录
     * @param user
     * @param request
     * @return
     * @throws NoSuchAlgorithmException 
     */
    @RequestMapping(value="login",method={RequestMethod.POST,RequestMethod.GET})
    @ResponseBody
    public Map<String,Object> login(String userName,String password,HttpServletRequest request,HttpServletResponse response,HttpSession session) throws NoSuchAlgorithmException{
        return service.loginValid(userName, password, request,response,session);
    }

service

/**
     * 验证登录
     * @param login_name
     * @param login_password
     * @param request
     * @return
     */
    public Map<String, Object> loginValid(String userName,String password,HttpServletRequest request,HttpServletResponse response,HttpSession session){
        User user=mapper.queryByUsernameAndPassword(userName, MD5Utils.DecodeByMd5(password.toString()));
        Map<String, Object> map=new HashMap<>();
        if(user==null || "".equals(user)){
            map.put("status", "error");
            map.put("msg", "用户名或密码错误！");
        }else if(user!=null && !"".equals(user) && user.getUser_id()!=0){
            user.setPassword(MD5Utils.DecodeByMd5(user.getPassword()));
            SysLogAop.getUser(user);
            map.put("status", "ok");
            map.put("msg", "登录成功！");
            request.getSession().setAttribute("user", user);
            session.setAttribute(String.valueOf(user.getUser_id()), user); //连接websocket
            System.out.println("连接websocket---------------");
            request.getSession().setMaxInactiveInterval(30*60);//session超时30min
        }
        return map;
    }

接下来是配置文件
web.xml
加上

<absolute-ordering/>

虽然我也不知道为什么，文档是这么写的 哈哈哈
然后在每个filter和servlet标签里加上 异步支持 比如

<!-- springMVC配置开始 -->
<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <!--  初始化配置文件 -->
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:/springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>
  <!-- 配置DispatcherServlet响应路径 -->
  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

 <!-- springMVC配置结束 -->

  <filter>
    <filter-name>LoginFilter</filter-name>
    <filter-class>com.ys.interceptors.LoginFilter</filter-class>
    <async-supported>true</async-supported>
  </filter>
  <filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
  </filter-mapping>

配置Spring配置文件applicationContext.xml
引入WebSocket

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:websocket="http://www.springframework.org/schema/websocket"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/websocket
        http://www.springframework.org/schema/websocket/spring-websocket.xsd">

然后扫描你的socket包

<context:component-scan base-package="com" use-default-filters="false">
    org.springframework.stereotype.Repository   Repository仓库-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:include-filter type="annotation" expression="org.springframework.beans.factory.annotation.Autowired"/>
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
    </context:component-scan>

我这里是controller扫描的一块扫描了，不用修改了

后端配置基本完成了。然后是页面的配置。

页面消息侧栏是这样的

我这里页面代码就不贴了 直接JS吧
首先引入 socket 的JS文件 ， 这个文件我在最后贴上，或者去网上复制一个放到本地
然后编写新建一个JS 代码如下：

$(function(){

    var wsPath=wsPath();
function wsPath(){
    var local=window.location;
    var contextPath=local.pathname.split("/")[1];
    return "ws://"+local.host+"/"+contextPath+"/";
};

    //建立socket连接
    var sock;
    var lockReconnect = false,count=0;
    createWebSocket(); 


    function createWebSocket(){
        try {
            if ('WebSocket' in window) {
                sock = new WebSocket(wsPath+"socketServer"); 
            } else if ('MozWebSocket' in window) {
                sock = new MozWebSocket(wsPath+"socketServer");
            } else {
                sock = new SockJS(wsPath+"sockjs/socketServer");
            }
            init();
        } catch (e) {
            console.log('Ceate WebSocket Error ! Tring To RestConnection !'+e);
            restConnect();
        }

    }

    function init(){
        sock.onopen = function (e) {
            heartCheck.start();
            console.debug(" WebSocket Connection Success ! ");
        };
        sock.onmessage = function (e) {
            heartCheck.reset();
            if(e.data==""){
                return false;
            }
            var socketMSG=JSON.parse(e.data);
            //socketMSG.MSG 我这里后端传的是个json 所以这么写的
            if(socketMSG.MSG!=undefined){
            //e.data是获取后端传送的消息，我这里的操作时把信息拿出来放到消息栏并提示， 这里根据自己的需求修改吧。
            }
        };
        sock.onerror = function (e) {
            console.error(" WebSocket Connection Failure ! Tring To RestConnect !"+e);
            restConnect();
        };
        sock.onclose = function (e) {
            console.warn(" WebSocket Connection Close ! Tring To RestConnect !"+e);
            restConnect();
        }
    }


    function restConnect(){
        if(lockReconnect){
            return;
        }
        if(count<=3){
            createWebSocket();
            lockReconnect=true;
        }else{
            console.error('WebSocket Connection Timeout!');
        }
    }

    var heartCheck = {
        timeout: 300000,//60ms
        timeoutObj: null,
        serverTimeoutObj: null,
        reset: function(){
            clearTimeout(this.timeoutObj);
            clearTimeout(this.serverTimeoutObj);
    　　　　 this.start();
        },
        start: function(){
            var _this = this;
            this.timeoutObj = setTimeout(function(){
                sock.send("");
                _this.serverTimeoutObj = setTimeout(function(){
                    sock.close();
                }, _this.timeout)
            }, this.timeout)
        }
    };


  //窗口关闭前,主动关闭websocket连接 
    window.onbeforeunload = function () { 
        sock.close(); 
    };

});

这里也写了个心跳重连，重新连接就是断开连接的时候socket会执行onclose()方法，然后在onclose方法里调用restConnect();方法重新连接。
然后在连接成功的时候调用heartCheck.start();方法开始计时，每间隔一段时间给后端service发送一次消息，如果有返回信息就说明连接没有断开，这时候再调用heartCheck.reset();方法重新计时

我这里发送消息触发是在message这个表插入数据成功的时候推送的消息。

@Autowired
    private SocketHandler socketHandler;

/**
     * @Title: sendMessage 
     * @Description:    给某个人推送消息
     * @param @param send_id
     * @param @param receive_id
     * @param @param type
     * @param @param content
     * @param @param sendTime
     * @param @param url
     * @return void
     */
    public void sendMessage(int send_id,int receive_id,String type,String content,Timestamp sendTime,String url){
        Message msg=new Message();
        msg.setSend_id(send_id);
        msg.setReceive_id(receive_id);
        msg.setType(type);
        msg.setContent(content);
        msg.setSendTime(sendTime);
        msg.setUrl(url);
        int result=mservice.addMessage(msg);
        if(result>0){
            User user=uservice.queryUserById(send_id);
            msg.setSendName(user.getName());
            Map<String,Object> map=new HashMap<>();
            map.put("MSG", msg);
            socketHandler.sendMessageToUser(String.valueOf(receive_id), new TextMessage(JSONObject.fromObject(map).toString()));
        }
    }

需要推送消息的 比如说 申请之类的功能直接推送给审批人。

推送给所有人就调用socketHandler里的sendMessageToUsers（）方法。
这个所有人是 在线的人。
到这里 已经完成了， 需要的可以配置一下玩玩。
下面是socket的JS文件 我这里用的是socket.min.js

/* sockjs-client v1.0.3 | http://sockjs.org | MIT license */
!function(t){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{var e;"undefined"!=typeof window?e=window:"undefined"!=typeof global?e=global:"undefined"!=typeof self&&(e=self),e.SockJS=t()}}(function(){var t;return function e(t,n,r){function i(s,a){if(!n[s]){if(!t[s]){var u="function"==typeof require&&require;if(!a&&u)return u(s,!0);if(o)return o(s,!0);var l=new Error("Cannot find module '"+s+"'");throw l.code="MODULE_NOT_FOUND",l}var c=n[s]={exports:{}};t[s][0].call(c.exports,function(e){var n=t[s][1][e];return i(n?n:e)},c,c.exports,e,t,n,r)}return n[s].exports}for(var o="function"==typeof require&&require,s=0;s<r.length;s++)i(r[s]);return i}({1:[function(t,e){(function(n){"use strict";var r=t("./transport-list");e.exports=t("./main")(r),"_sockjs_onload"in n&&setTimeout(n._sockjs_onload,1)}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./main":14,"./transport-list":16}],2:[function(t,e){"use strict";function n(){i.call(this),this.initEvent("close",!1,!1),this.wasClean=!1,this.code=0,this.reason=""}var r=t("inherits"),i=t("./event");r(n,i),e.exports=n},{"./event":4,inherits:54}],3:[function(t,e){"use strict";function n(){i.call(this)}var r=t("inherits"),i=t("./eventtarget");r(n,i),n.prototype.removeAllListeners=function(t){t?delete this._listeners[t]:this._listeners={}},n.prototype.once=function(t,e){function n(){r.removeListener(t,n),i||(i=!0,e.apply(this,arguments))}var r=this,i=!1;this.on(t,n)},n.prototype.emit=function(t){var e=this._listeners[t];if(e)for(var n=Array.prototype.slice.call(arguments,1),r=0;r<e.length;r++)e[r].apply(this,n)},n.prototype.on=n.prototype.addListener=i.prototype.addEventListener,n.prototype.removeListener=i.prototype.removeEventListener,e.exports.EventEmitter=n},{"./eventtarget":5,inherits:54}],4:[function(t,e){"use strict";function n(t){this.type=t}n.prototype.initEvent=function(t,e,n){return this.type=t,this.bubbles=e,this.cancelable=n,this.timeStamp=+new Date,this},n.prototype.stopPropagation=function(){},n.prototype.preventDefault=function(){},n.CAPTURING_PHASE=1,n.AT_TARGET=2,n.BUBBLING_PHASE=3,e.exports=n},{}],5:[function(t,e){"use strict";function n(){this._listeners={}}n.prototype.addEventListener=function(t,e){t in this._listeners||(this._listeners[t]=[]);var n=this._listeners[t];-1===n.indexOf(e)&&(n=n.concat([e])),this._listeners[t]=n},n.prototype.removeEventListener=function(t,e){var n=this._listeners[t];if(n){var r=n.indexOf(e);return-1!==r?void(n.length>1?this._listeners[t]=n.slice(0,r).concat(n.slice(r+1)):delete this._listeners[t]):void 0}},n.prototype.dispatchEvent=function(t){var e=t.type,n=Array.prototype.slice.call(arguments,0);if(this["on"+e]&&this["on"+e].apply(this,n),e in this._listeners)for(var r=this._listeners[e],i=0;i<r.length;i++)r[i].apply(this,n)},e.exports=n},{}],6:[function(t,e){"use strict";function n(t){i.call(this),this.initEvent("message",!1,!1),this.data=t}var r=t("inherits"),i=t("./event");r(n,i),e.exports=n},{"./event":4,inherits:54}],7:[function(t,e){"use strict";function n(t){this._transport=t,t.on("message",this._transportMessage.bind(this)),t.on("close",this._transportClose.bind(this))}var r=t("json3"),i=t("./utils/iframe");n.prototype._transportClose=function(t,e){i.postMessage("c",r.stringify([t,e]))},n.prototype._transportMessage=function(t){i.postMessage("t",t)},n.prototype._send=function(t){this._transport.send(t)},n.prototype._close=function(){this._transport.close(),this._transport.removeAllListeners()},e.exports=n},{"./utils/iframe":47,json3:55}],8:[function(t,e){"use strict";var n=t("./utils/url"),r=t("./utils/event"),i=t("json3"),o=t("./facade"),s=t("./info-iframe-receiver"),a=t("./utils/iframe"),u=t("./location");e.exports=function(t,e){var l={};e.forEach(function(t){t.facadeTransport&&(l[t.facadeTransport.transportName]=t.facadeTransport)}),l[s.transportName]=s;var c;t.bootstrap_iframe=function(){var e;a.currentWindowId=u.hash.slice(1);var s=function(r){if(r.source===parent&&("undefined"==typeof c&&(c=r.origin),r.origin===c)){var s;try{s=i.parse(r.data)}catch(f){return}if(s.windowId===a.currentWindowId)switch(s.type){case"s":var h;try{h=i.parse(s.data)}catch(f){break}var d=h[0],p=h[1],v=h[2],m=h[3];if(d!==t.version)throw new Error('Incompatibile SockJS! Main site uses: "'+d+'", the iframe: "'+t.version+'".');if(!n.isOriginEqual(v,u.href)||!n.isOriginEqual(m,u.href))throw new Error("Can't connect to different domain from within an iframe. 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