socket系列（三）——Spring-socket实时通信、推送

逝兮诚

发布于 2019-10-30 13:21:40

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发布于 2019-10-30 13:21:40

文章被收录于专栏：代码人生

本文链接：https://blog.csdn.net/luo4105/article/details/72695378

Spring-socket实现实时通信

实现

Spring4.x发布spring-socket模块包，用于支持websocket，同时兼容支持socketJS。

需要把spring所有的包更新到4.x以上版本，并下载spring-websocket包。

所需jar包

<dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-context</artifactId>
         <version>${org.springframework-version}</version>
</dependency>
<dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-web</artifactId>
         <version>${org.springframework-version}</version>
</dependency>
<dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>${org.springframework-version}</version>
</dependency>
<dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-websocket</artifactId>
         <version>${org.springframework-version}</version>
</dependency>
<dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>javax.servlet-api</artifactId>
         <version>3.1.0</version>
         <scope>provided</scope>
</dependency>
 
<!-- For SockJS -->
<!--http://jira.codehaus.org/browse/JACKSON-884 -->
<dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
         <version>2.2.1</version>
</dependency>
 
<dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
         <version>1.6.4</version>
</dependency>
<dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>jcl-over-slf4j</artifactId>
         <version>1.6.4</version>
         <scope>runtime</scope>
</dependency>
<dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-log4j12</artifactId>
         <version>1.6.4</version>
         <scope>runtime</scope>
</dependency>
<dependency>
         <groupId>log4j</groupId>
         <artifactId>log4j</artifactId>
         <version>1.2.16</version>
         <scope>runtime</scope>
</dependency>
 
<dependency>
         <groupId>commons-logging</groupId>
         <artifactId>commons-logging</artifactId>
         <version>1.1</version>
         <exclusions>
                   <exclusion>
                            <groupId>javax.servlet</groupId>
                            <artifactId>servlet-api</artifactId>
                   </exclusion>
         </exclusions>
</dependency>

官方的demo地址：https://github.com/rstoyanchev/spring-websocket-test

项目结构，马赛克的文件不用管

SpringMVC配置文件

<?xml version="1.0"encoding="UTF-8"?>
<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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:websocket="http://www.springframework.org/schema/websocket"
    xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.2.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
       http://www.springframework.org/schema/websocket
        http://www.springframework.org/schema/websocket/spring-websocket-4.1.xsd">
 
    <context:component-scan base-package="com.lc.controller">
       <context:include-filter type="annotation"
           expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <mvc:annotation-driven />
 
    <!-- websocket配置 -->
    <bean id="HelloHandler" class="com.lc.websocket.MySorketHandle" />
    <websocket:handlers>
       <!-- 配置消息处理bean和路径的映射关系 -->
       <websocket:mapping path="/hello" handler="HelloHandler"/>
       <!-- 配置握手拦截器 -->
       <websocket:handshake-interceptors>
           <bean class="com.lc.websocket.HandshakeInterceptor"/>
       </websocket:handshake-interceptors>
       <!-- 开启sockjs，去掉则关闭sockjs -->
       <!-- <websocket:sockjs /> -->
    </websocket:handlers>
    <!-- 配置websocket消息的最大缓冲区长度 -->
    <!-- <bean
    class="org.springframework.web.socket.server.standard.ServletServerContainerFactoryBean">
       <propertyname="maxTextMessageBufferSize" value="8192" />
       <propertyname="maxBinaryMessageBufferSize" value="8192" />
    </bean>-->
 
    <!-- 视图层配置 -->
    <bean
       class="org.springframework.web.servlet.view.InternalResourceViewResolver">
       <property name="prefix" value="/WEB-INF/jsps/"/>
       <property name="suffix" value=".jsp"/>
    </bean>
</beans>

Websorket实现类

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
 
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
 
public classMySorketHandle extends TextWebSocketHandler {
 
    // 线上人数
    private static int count;
    private staticCopyOnWriteArraySet<WebSocketSession> set = new CopyOnWriteArraySet<>();
    private WebSocketSession session;
 
    @Override
    public voidafterConnectionEstablished(WebSocketSession session) {
       this.session = session;
       try{
           set.add(this.session);
       }catch(Exception e) {
           e.printStackTrace();
       }
       MySorketHandle.addOnlineCount();
       System.out.println("目前连接人数：" + getOnlineCount());
    }
 
    public voidafterConnectionClosed(WebSocketSession session,CloseStatus closeStatus) {
       this.session = session;
       set.remove(this.session);
       subOnlineCount();
       System.out.println("目前连接人数：" + getOnlineCount());
    }
   
    public void handleMessage(WebSocketSessionsession,WebSocketMessage<?>message){
       System.out.println("text message: "+ session.getId()+ "-"+ message.getPayload());
       for(WebSocketSession ssion : set) {
           try {
              ssion.sendMessage(message);
           }catch(IOException e) {
              e.printStackTrace();
           }
       }
    }
   
    public static int getOnlineCount() {
       return count;
    }
 
    public static void addOnlineCount() {
       count++;
    }
 
    public static void subOnlineCount() {
       count--;
    }
}

HandshakeInterceptor类

import java.util.Map;
 
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.socket.WebSocketHandler;
importorg.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor;
 
public classHandshakeInterceptor extends HttpSessionHandshakeInterceptor {
 
    /*
     * 握手前处理动作
     */
    @Override
    public booleanbeforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler,
           Map<String,Object> map)throwsException {
       System.out.println("握手前");
       return super.beforeHandshake(request, response, handler, map);
    }
   
    @Override
    public void afterHandshake(ServerHttpRequestrequest,ServerHttpResponse response,WebSocketHandler wsHandler,Exception ex) {
       super.afterHandshake(request, response, wsHandler, ex);
    }
}

Controller页面跳转

@Controller
@RequestMapping("/im")
public classIMController {
   
    @RequestMapping("/page")
    public Stringpage(HttpServletRequest request, HttpServletResponse response) {
       return "IMpage";
    }
}

页面

<%@ page language="java"contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title>socket</title>
       <script type="text/javascript" src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
    </head>
    <body>
       welcome<br />
       <input id="text" type="text"/>
       <button οnclick="sendMsg()">sendMsg</button>
       <hr/>
       <button οnclick="closeWebSocket()">close WebSocketconnection</button>
       <hr/>
       <div id="message"></div>
    </body>
   
    <script type="text/javascript">
       var websocket = null;
       //判断浏览器是否支持websocket
       if('WebSocket' in window) {
           websocket = new WebSocket("ws://localhost:8080/sdz-web//hello");
       }else{
           $("#message").html("该浏览器不支持实时通信功能");
       }
      
       websocket.onopen= function() {
           console.log("websocket连接成功");
       }
      
       websocket.onclose= function() {
           console.log("websocket连接关闭");
       }
      
       websocket.onmessage= function(event) {
           console.log("接收消息");
           console.log(event);
           printMsg(event.data);
       }
      
       //打印消息
       function printMsg(msg) {
           $("#message").append(msg+ "<br/>");
       }
      
       function sendMsg() {
           var msg = $("#text").val();
           websocket.send(msg);
       }
      
       function closeWebSocket(){
           websocket.close();
       }
    </script>
</html>

运行

总结

MySorketHandle类是websocket的实现类，这里我继承TextWebSocketHandler类，也可以实现WebSocketHandle接口，详细可以看看官方文档，这里大致介绍一下几个主要方法。

afterConnectionEstablished(WebSocketSessionsession)：当有新的连接时执行方法，这里执行的是给session赋值，添加该连接对象，增加连接数量，打印连接信息

afterConnectionClosed(WebSocketSessionsession,CloseStatus closeStatus)：当有连接关闭时执行方法，这里执行的是移除连接对象和打印信息操作。

handleMessage(WebSocketSessionsession,WebSocketMessage<?> message)：当有新消息传后台时执行方法，这里执行的是给所有连接对象发送该请求。

handleTransportError(WebSocketSessionsession,Throwable exception)：当有连接错误/异常时执行方法。

在spring-socket中，每次连接，都不会创建新的MySorketHandle，但会创建新的sesion对象，所以这里用CopyOnWriteArraySet<WebSocketSession> set来存放所有连接对象。

配置方面主要是这些

<!-- websocket配置 -->
<bean id="HelloHandler"class="com.lc.websocket.MySorketHandle" />
<websocket:handlers>
         <!--配置消息处理bean和路径的映射关系 -->
         <websocket:mappingpath="/hello" handler="HelloHandler" />
         <!--配置握手拦截器 -->
         <websocket:handshake-interceptors>
                   <beanclass="com.lc.websocket.HandshakeInterceptor" />
         </websocket:handshake-interceptors>
         <!--开启sockjs，去掉则关闭sockjs -->
         <!--<websocket:sockjs /> -->
</websocket:handlers>

<!-- 配置websocket消息的最大缓冲区长度-->
<!-- <bean
         class="org.springframework.web.socket.server.standard.ServletServerContainerFactoryBean">
         <propertyname="maxTextMessageBufferSize" value="8192" />
         <propertyname="maxBinaryMessageBufferSize" value="8192" />
</bean> -->

当然，别忘了加上

xmlns:websocket="http://www.springframework.org/schema/websocket"
xsi:schemaLocation="http://www.springframework.org/schema/websocket
             http://www.springframework.org/schema/websocket/spring-websocket-4.1.xsd"

实现触发推送

对于上个例子，实现服务器触发推送功能，需求如下：

访问” http://127.0.0.1:8080/sdz-web/im/push”接口时，服务器会向指定的连接客户端推送信息，参数sessionId是客户端连接的sessionId，如果不带参数，则向所有的连接的客户端推送信息。

实现

项目结构，马赛克的文件不用管

编写测试方法，分别测试全部推送和指定推送

public classIMControllerPushTest {
   
    @Test
    public void pushAll() throws IOException {
       URLurl= newURL("http://127.0.0.1:8080/sdz-web/im/push");
       HttpURLConnectionconn= (HttpURLConnection) url.openConnection();
       conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64;x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110Safari/537.36");
       conn.setDoOutput(true);
       conn.setDoInput(true);
       OutputStreamos = conn.getOutputStream();
       Stringparams= "";
       os.write(params.getBytes("UTF-8"));
       InputStreamis = conn.getInputStream();
       byte[] res = new byte[1024];
       StringBuffersb = new StringBuffer();
       int l = 0;
       while((l = is.read(res)) != -1) {
           sb.append(new String(res, 0, l, "UTF-8"));
       }
       System.out.println(sb);
    }
   
    @Test
    public void push() throws IOException {
       URLurl= newURL("http://127.0.0.1:8080/sdz-web/im/push");
       HttpURLConnectionconn= (HttpURLConnection) url.openConnection();
       conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64;x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110Safari/537.36");
       conn.setDoOutput(true);
       conn.setDoInput(true);
       OutputStreamos = conn.getOutputStream();
       Stringparams= "sessionId=0";
       os.write(params.getBytes("UTF-8"));
       InputStreamis = conn.getInputStream();
       byte[] res = new byte[1024];
       StringBuffersb = new StringBuffer();
       int l = 0;
       while((l = is.read(res)) != -1) {
           sb.append(new String(res, 0, l, "UTF-8"));
       }
       System.out.println(sb);
    }
}

IMController

@Controller
@RequestMapping("/im")
public classIMController {
 
    @Bean
    public MySorketHandlemySorketHandle() {
       return new MySorketHandle();
    }
 
    @RequestMapping("/page")
    public Stringpage(HttpServletRequest request, HttpServletResponse response) {
       return "IMpage";
    }
 
    @ResponseBody
    @RequestMapping("/push")
    public String push(@RequestParam(required = false) String sessionId,
           HttpServletResponseresponse){
       Stringmsg= "";
       if (StringUtils.isEmpty(sessionId)) {
           msg =mySorketHandle().pushMsg("服务器推送信息了");
           System.out.println(msg);
       }else{
           msg =mySorketHandle().pushMsg(sessionId, "服务器推送信息了");
           System.out.println(msg);
       }
       return msg;
    }
}

MySorkerHandler

/**
 * 给指定连接推消息
 * @param session
 * @param message
 */
public String pushMsg(String sessionid, String message){
    for(WebSocketSession ssion : set) {
       try {
           if(sessionid.equals(ssion.getId())){
              ssion.sendMessage(new TextMessage(message));
              return "机器:" + sessionid+ "推送成功";
           }
       }catch(IOException e) {
           e.printStackTrace();
       }
    }
    return "推送失败";
}
 
/**
 * 给全部连接
 * @param message
 * @return
 */
public String pushMsg(String message) {
    int i = 0;
    for(WebSocketSession ssion : set) {
       try {
           ssion.sendMessage(new TextMessage(message));
           i++;
       }catch(IOException e) {
           e.printStackTrace();
       }
    }
    return "共有" + i + "得到推送";
}

运行

总结

关键代码就是socket的功能实现和controller的调用

controller的调用

@Bean
public MySorketHandle mySorketHandle() {
         returnnew MySorketHandle();
}

@ResponseBody
@RequestMapping("/push")
public String push(@RequestParam(required =false) String sessionId,
                   HttpServletResponseresponse) {
         Stringmsg = "";
         if(StringUtils.isEmpty(sessionId)) {
                   msg= mySorketHandle().pushMsg("服务器推送信息了");
                   System.out.println(msg);
         }else {
                   msg= mySorketHandle().pushMsg(sessionId, "服务器推送信息了");
                   System.out.println(msg);
         }
         returnmsg;
}

socket的功能

/**
 * 给指定连接推消息
 * @param session
 * @param message
 */
public String pushMsg(String sessionid, String message){
    for(WebSocketSession ssion : set) {
       try {
           if(sessionid.equals(ssion.getId())){
              ssion.sendMessage(new TextMessage(message));
              return "机器:" + sessionid+ "推送成功";
           }
       }catch(IOException e) {
           e.printStackTrace();
       }
    }
    return "推送失败";
}

/**
 * 给全部连接
 * @param message
 * @return
 */
public String pushMsg(String message) {
    int i = 0;
    for(WebSocketSession ssion : set) {
       try {
           ssion.sendMessage(new TextMessage(message));
           i++;
       }catch(IOException e) {
           e.printStackTrace();
       }
    }
    return "共有" + i + "得到推送";
}

Push是一个触发接口，调用MySorketHandle的pushMsg()方法。

如果”@ResponBody”返回数据是乱码，在配置文件中加上

<mvc:annotation-driven >
    <mvc:message-converters register-defaults="true">
       <bean class="org.springframework.http.converter.StringHttpMessageConverter">
           <property name="supportedMediaTypes" value="text/html;charset=UTF-8"/>
       </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

原因是springMVC对string的处理类StringHttpMessageConverter 中，默认采用的字符集是ISO-8859-1，而且是final的。

public static final Charset DEFAULT_CHARSET= Charset.forName("ISO-8859-1");

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