springMVC（spring）+WebSocket案例（获取请求参数）

2022-03-19 12:02:03

开发环境(最低版本)：spring 4.0+java7+tomcat7.0.47+sockjs

前端页面要引入：

<script src="http://cdn.jsdelivr.net/sockjs/1/sockjs.min.js"></script>

maven依赖：

<dependency>

            <groupId>org.java-websocket</groupId>

            <artifactId>Java-WebSocket</artifactId>

            <version>1.3.0</version>

        </dependency>

<dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-websocket</artifactId>

            <version>4.3.10.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-messaging</artifactId>

            <version>4.3.10.RELEASE</version>

        </dependency>

前端js：

var ws = null;

function openWebSocket(){

    //判断当前浏览器是否支持WebSocket

    if ('WebSocket' in window) {

        ws = new WebSocket("ws://"+window.location.host+"/项目名称/visualizationWebSocket.do?type=mall");

    } else {

        ws = new SockJS("http://"+window.location.host+"/项目名称/sockjs/visualizationWebSocket/info?type=mall");

    }

    ws.onopen = function () {

    };
　　//这个事件是接受后端传过来的数据

    ws.onmessage = function (event) {

        //根据业务逻辑解析数据

    };

    ws.onclose = function (event) {

    };

}

我实现连接后台的方式如下：

//页面已加载后加载后台数据

$(function (){

    $.ajax({

        cache:false,

        data:"",

        type:"post",

        url:"",

        success:function(data, textStatus){

            if(data && data.status === "1"){

               　//这里可以初始化操作

                openWebSocket();//websocket连接到后台

                if(ws){

                    setTimeout(function (){

                        ws.send("");//发送信息到后台，开始有数据跟新就写到前端显示

                    },3000);

                }

            } else {

                alert("操作失败！");

            }

        },

        error:function(XMLHttpRequest, textStatus, errorThrown){}

    });

    function zeroPadding(num, digit) {

        var zero = '';

        for(var i = 0; i < digit; i++) {

            zero += '0';

        }

        return (zero + num).slice(-digit);

    }

    function showDate() {

        var date = new Date();

        var str = "" + zeroPadding(date.getFullYear(),4) + "-";

        str += zeroPadding((date.getMonth() + 1),2) + "-";

        str += zeroPadding(date.getDate(),2) + "&nbsp;&nbsp;&nbsp;&nbsp;";

        str += zeroPadding(date.getHours(),2) + '：';

        str += zeroPadding(date.getMinutes(),2) + '：';

        str += zeroPadding(date.getSeconds(),2) + '';

        return str;

    }

    setInterval(function () {

        $('.data-time').html(showDate)

    }, 1000);

});

后端：

webSocket配置

package com.snw.supplyChain.websocket;

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;

@Configuration

@EnableWebSocket

@EnableWebMvc

public class VisualizationWebSocketConfig implements WebSocketConfigurer {

    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
　　　　　//这里的url要与页面的url一致

        webSocketHandlerRegistry.addHandler(myHandler(),"/visualizationWebSocket.do").addInterceptors(new VisualizationHandshakeInterceptor());
　　　　　//至于这里为什么要加info，我遇见的情况是，当我使用sockjs来代替websocket时，连接的后面会自动加上info

        webSocketHandlerRegistry.addHandler(myHandler(),"/sockjs/visualizationWebSocket/info").addInterceptors(new VisualizationHandshakeInterceptor()).withSockJS();

    }

    @Bean

    public WebSocketHandler myHandler(){

        return new VisualizationWebSocketHandler();

    }

}

回话拦截器

package com.snw.supplyChain.websocket;

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.support.HttpSessionHandshakeInterceptor;

import javax.servlet.http.HttpServletRequest;

import java.util.Map;

//回话拦截器

public class VisualizationHandshakeInterceptor extends HttpSessionHandshakeInterceptor {

    @Override

    public boolean beforeHandshake(ServerHttpRequest request,

                                   ServerHttpResponse response, WebSocketHandler wsHandler,

                                   Map<String, Object> attributes) throws Exception {
　　　　　//获取请求参数，首先我们要获取HttpServletRequest对象才能获取请求参数；当ServerHttpRequset的层次结构打开后其子类可以获取到我们想要的http对象，那么就简单了。
　　　　//我这里是把获取的请求数据绑定到session的map对象中（attributes）

        HttpServletRequest servletRequest = ((ServletServerHttpRequest) request).getServletRequest();

        String id = servletRequest.getSession().getId();

        System.out.println("beforeHandshake: \n"+id);

        String type = servletRequest.getParameter("type");

        attributes.put("mall",type);

        return super.beforeHandshake(request, response, wsHandler, attributes);

    }

    @Override

    public void afterHandshake(ServerHttpRequest request,

                               ServerHttpResponse response, WebSocketHandler wsHandler,

                               Exception ex) {

        System.out.println("After Handshake");

        super.afterHandshake(request, response, wsHandler, ex);

    }

}

websocket处理器

处理器里面可以注入想要的service

package com.snw.supplyChain.websocket;

import com.snw.supplyChain.model.VisualizationProduct;

import com.snw.supplyChain.service.IVisualizationService;

import net.sf.json.JSONObject;

import org.apache.commons.lang3.StringUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.socket.CloseStatus;

import org.springframework.web.socket.TextMessage;

import org.springframework.web.socket.WebSocketSession;

import org.springframework.web.socket.handler.TextWebSocketHandler;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

public class VisualizationWebSocketHandler extends TextWebSocketHandler {

    private static final Map<String,WebSocketSession> sessions = new HashMap<String, WebSocketSession>();

    private static final Map<String,Thread> threads = new HashMap<String, Thread>();

    private  Thread polingVisualization = null;

    //用户标识

    private static final String CLIENT_ID = "sessionId";

    @Autowired

    private IVisualizationService visualizationService;

    @Override

    public void afterConnectionEstablished(WebSocketSession session) throws Exception {

        System.out.println("afterConnectionEstablished: \n"+session.getId());

        Object sessionType = session.getAttributes().get("mall");

        if(sessionType != null && "mall".equals(sessionType)){

            sessions.put(CLIENT_ID,session);

            sessions.put(session.getId(),session);

        }

        super.afterConnectionEstablished(session);

    }

    @Override

    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) {

        Thread thread = threads.get(session.getId());

        if(thread != null){

            thread.interrupt();

            try {

                thread.join();

                threads.remove(session.getId());

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        sessions.remove(session.getId());

        sessions.remove(CLIENT_ID);

        polingVisualization = null;

        try {

            super.afterConnectionClosed(session, status);

        } catch (Exception e) {

        }

    }

　　　//这里是处理前端发送的消息以及返回给前端的数据

　　　　//可以从session里面获取attributes，

    @Override

    protected void handleTextMessage(WebSocketSession session,

                                     TextMessage message) throws Exception {

        super.handleTextMessage(session, message);

        Thread thread = threads.get(session.getId());

        if(thread == null){

           System.out.println("handleTextMessage: \n"+session.getId());

           WebSocketSession sessi =  sessions.get(session.getId());

           if(sessi == null){

                sessions.put(session.getId(),session);

           } else {

               session = sessi;

           }

           final WebSocketSession localSession = session;

           final TextMessage localMessage = message;

            String payload = message.getPayload();

            if(StringUtils.isNotBlank(payload)){

                String[] split = payload.split("_");

                if(StringUtils.isNotBlank(split[2])){

                    if("mall".equals(split[1])){

                        final int universalid = Integer.parseInt(split[2]);

　　　　　　　　　　　　　　　//这里的Thread可以用java.util.concurrent代替

                        Thread polingVisualization = new Thread(new Runnable() {

                            public void run() {

                                while(!Thread.currentThread().isInterrupted()){

                                    try {

                                        polingVisualization(localSession, localMessage, universalid);

                                        try {

                                            Thread.sleep(180000);//

                                        } catch (InterruptedException e) {

                                            e.printStackTrace();

                                        }

                                    } catch (IOException e) {

                                        e.printStackTrace();

                                    }

                                }

                            }

                        });

                        polingVisualization.start();

                        threads.put(sessi.getId(),polingVisualization);

                    }

                }

            }

        }

    }

    private VisualizationProduct polingVisualization(WebSocketSession session,

                                     TextMessage message,Integer universalid) throws IOException {

        VisualizationProduct visualizationProduct = visualizationService.findInquiryPriceOrderVisualization(universalid);

        Map<String,Object> dataMap = new HashMap<String, Object>();

        dataMap.put("status","1");

        dataMap.put("visualizationProduct", visualizationProduct);

        String dataStr = JSONObject.fromObject(dataMap).toString();

        TextMessage  returnMessage = new TextMessage(dataStr);

        session.sendMessage(returnMessage);

        return visualizationProduct;

    }

    /**

     * 给正在发布的商品发送新数据

     * @param universalid 发布会ID

     * @param sessionId

     */

    public void sendNewProductDatas(Integer universalid, String sessionId){

        if(universalid != null){

            Set<String> keys = sessions.keySet();

            for (String key : keys) {

                WebSocketSession webSocketSession = sessions.get(key);

                if(webSocketSession != null && webSocketSession.isOpen()){

                    VisualizationProduct visualizationProduct = visualizationService.findInquiryPriceOrderVisualization(universalid);

                    Map<String,Object> dataMap = new HashMap<String, Object>();

                    dataMap.put("status","1");

                    dataMap.put("visualizationProduct", visualizationProduct);

                    String dataStr = JSONObject.fromObject(dataMap).toString();

                    System.out.println(dataStr);

                    TextMessage returnMessage = new TextMessage(dataStr);

                    try {

                        webSocketSession.sendMessage(returnMessage);

                    } catch (IOException e) {

                        e.printStackTrace();

                    }

                }

            }

        }

    }

}

spring配置文件

文件标签，根据需要的添加，比如：websocket的xmlns和xsi:schemaLocation

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:jee="http://www.springframework.org/schema/jee"

       xmlns:websocket="http://www.springframework.org/schema/websocket"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc"

       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/jee http://www.springframework.org/schema/jee/spring-jee.xsd

            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.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">

<!-- 配置好处理器 -->

<bean id="websocketHandler" class="com.snw.supplyChain.websocket.VisualizationWebSocketHandler"/>

<!-- 配置拦截器 -->

    <websocket:handlers>

        <websocket:mapping path="/visualizationWebSocket.do" handler="websocketHandler"/><!-- 连接的URL -->

        <websocket:handshake-interceptors>

            <bean class="com.snw.supplyChain.websocket.VisualizationHandshakeInterceptor"/>

        </websocket:handshake-interceptors>

    </websocket:handlers>

欢迎各位大神指点其中不足哟。

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