基于spring实现websocket实时推送实例

基于spring框架来写的，websocket实时推送例子，具体内容如下

第一步：自己搭建一个springmvc项目，很简单，网上百度都有；pom文件添加以下：

<!-- WebSocket -->
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-websocket</artifactId>
 <version>4.2.4.RELEASE</version>
 </dependency> 

 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-messaging</artifactId>
 <version>4.2.4.RELEASE</version>
 </dependency>

我的spring版本是4.2.4的，所以websocket也是4.2.4的；websocket最好和spring版本保持一致

第二步：编写消息处理器

/**
 * Project Name:springRabbitMQ
 * File Name:MyMessageHandler.java
 * Package Name:com.zsy.websocket
 * Date:2018年1月31日上午11:10:03
 * Copyright (c) 2018, zhaoshouyun All Rights Reserved.
 *
 */ 

package com.zsy.websocket; 

import java.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap; 

import org.apache.commons.lang3.StringUtils;
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; 

/**
 * ClassName: MyMessageHandler
 * Function: 实现webscoket接口
 * date: 2018年1月31日 上午11:10:03
 * @author zhaoshouyun
 * @version
 * @since JDK 1.7
 */
public class MyMessageHandler implements WebSocketHandler {
 //用户key
 public static final String USER_KEY = "current_user"; 

 /**
 * userMap:存储用户连接webscoket信息
 * @since JDK 1.7
 */
 private final static Map<String, WebSocketSession> userMap;
 static {
 userMap = new ConcurrentHashMap<String,WebSocketSession>(30);
 }
 /**
 * 关闭websocket时调用该方法
 * @see org.springframework.web.socket.WebSocketHandler#afterConnectionClosed(org.springframework.web.socket.WebSocketSession, org.springframework.web.socket.CloseStatus)
 */
 @Override
 public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
  String userId = this.getUserId(session);
  if(StringUtils.isNoneBlank(userId)){
  userMap.remove(userId);
  System.err.println("该" + userId +"用户已成功关闭");
  }else{
  System.err.println("关闭时，获取用户id为空");
  } 

 } 

 /**
 * 建立websocket连接时调用该方法
 * @see org.springframework.web.socket.WebSocketHandler#afterConnectionEstablished(org.springframework.web.socket.WebSocketSession)
 */
 @Override
 public void afterConnectionEstablished(WebSocketSession session) throws Exception {
 String userId = this.getUserId(session);
 if(StringUtils.isNoneBlank(userId)){
  userMap.put(userId, session);
  session.sendMessage(new TextMessage("建立WebSocket连接成功！"));
 } 

 } 

 /**
 * 客户端调用websocket.send时候，会调用该方法,进行数据通信
 * @see org.springframework.web.socket.WebSocketHandler#handleMessage(org.springframework.web.socket.WebSocketSession, org.springframework.web.socket.WebSocketMessage)
 */
 @Override
 public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
  String msg = message.toString();
  String userId = this.getUserId(session);
  System.err.println("该"+userId+"用户发送的消息是："+msg);
  message = new TextMessage("服务端已经接收到消息，msg="+msg);
  session.sendMessage(message); 

 } 

 /**
 * 传输过程出现异常时，调用该方法
 * @see org.springframework.web.socket.WebSocketHandler#handleTransportError(org.springframework.web.socket.WebSocketSession, java.lang.Throwable)
 */
 @Override
 public void handleTransportError(WebSocketSession session, Throwable e) throws Exception {
 WebSocketMessage<String> message = new TextMessage("异常信息："+e.getMessage());
 session.sendMessage(message);
 } 

 /**
 *
 * @see org.springframework.web.socket.WebSocketHandler#supportsPartialMessages()
 */
 @Override
 public boolean supportsPartialMessages() { 

 return false;
 } 

 /**
 * sendMessageToUser:发给指定用户
 * @author zhaoshouyun
 * @param userId
 * @param contents
 * @since JDK 1.7
 */
 public void sendMessageToUser(String userId,String contents) {
 WebSocketSession session = userMap.get(userId);
 if(session !=null && session.isOpen()) {
  try {
    TextMessage message = new TextMessage(contents);
  session.sendMessage(message);
  } catch (IOException e) {
  e.printStackTrace();
  }
 }
 } 

 /**
 * sendMessageToAllUsers:发给所有的用户
 * @author zhaoshouyun
 * @param contents
 * @since JDK 1.7
 */
 public void sendMessageToAllUsers(String contents) {
  Set<String> userIds = userMap.keySet();
  for(String userId: userIds) {
  this.sendMessageToUser(userId, contents);
  }
 } 

 /**
 * getUserId:获取用户id
 * @author zhaoshouyun
 * @param session
 * @return
 * @since JDK 1.7
 */
 private String getUserId(WebSocketSession session){
 try {
  String userId = (String)session.getAttributes().get(USER_KEY);
  return userId;
 } catch (Exception e) {
  e.printStackTrace();
 }
 return null;
 } 

}

第三步：编写websocket相关配置，当然可以在xml配置；我现在没有使用xml配置，使用代码配置，需要在xml里添加扫描包<context:component-scan base-package="com.zsy.websocket" />

/**
 * Project Name:springRabbitMQ
 * File Name:WebSocketConfig.java
 * Package Name:com.zsy.websocket
 * Date:2018年1月31日下午1:10:33
 * Copyright (c) 2018, zhaoshouyun All Rights Reserved.
 *
*/
/**
 * Project Name:springRabbitMQ
 * File Name:WebSocketConfig.java
 * Package Name:com.zsy.websocket
 * Date:2018年1月31日下午1:10:33
 * Copyright (c) 2018, zhaoshouyun All Rights Reserved.
 *
 */ 

package com.zsy.websocket; 

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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; 

/**
 * ClassName: WebSocketConfig
 * Function: TODO ADD FUNCTION.
 * date: 2018年1月31日 下午1:10:33
 * @author zhaoshouyun
 * @version
 * @since JDK 1.7
 */
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer { 

 /**
 * 注册handle
 * @see org.springframework.web.socket.config.annotation.WebSocketConfigurer#registerWebSocketHandlers(org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry)
 */
 @Override
 public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
  registry.addHandler(myHandler(), "/testHandler").addInterceptors(new WebSocketInterceptor());
  registry.addHandler(myHandler(), "/socketJs/testHandler").addInterceptors(new WebSocketInterceptor()).withSockJS(); 

 } 

 @Bean
 public WebSocketHandler myHandler(){
 return new MyMessageHandler();
 } 

} 

第四步：编写websocket适配器

package com.zsy.websocket; 

import java.util.Map; 

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; 

/**
 * ClassName: WebSocketInterceptor
 * Function: TODO ADD FUNCTION.
 * date: 2018年1月31日 上午11:42:34
 * @author zhaoshouyun
 * @version
 * @since JDK 1.7
 */
public class WebSocketInterceptor extends HttpSessionHandshakeInterceptor {
 /**
 * TODO 简单描述该方法的实现功能（可选）.
 * @see org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor#beforeHandshake(org.springframework.http.server.ServerHttpRequest, org.springframework.http.server.ServerHttpResponse, org.springframework.web.socket.WebSocketHandler, java.util.Map)
 */
 @Override
 public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,
  Map<String, Object> attributes) throws Exception {
 if(request instanceof ServletServerHttpRequest){
  ServletServerHttpRequest serverHttpRequest = (ServletServerHttpRequest)request;
  //获取参数
  String userId = serverHttpRequest .getServletRequest().getParameter("userId");
  attributes.put(MyMessageHandler.USER_KEY, userId);
 } 

 return true;
 }
}

第五步对应的js：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript"> 

var websocket; 

// 首先判断是否 支持 WebSocket
 if('WebSocket' in window) {
 websocket = new WebSocket("ws://localhost:8085/springTest/testHandler?userId=zhaoshouyun");
 } else if('MozWebSocket' in window) {
 websocket = new MozWebSocket("ws://localhost:8085/springTest/testHandler?userId=zhaoshouyun");
 } else {
 websocket = new SockJS("http://localhost:8085/springTest/socketJs/testHandler?userId=zhaoshouyun");
 } 

 // 打开连接时
 websocket.onopen = function(evnt) {
 console.log(" websocket.onopen ");
 }; 

 // 收到消息时
 websocket.onmessage = function(evnt) {
 alert(evnt.data);
 }; 

 websocket.onerror = function(evnt) {
 console.log(" websocket.onerror ");
 }; 

 websocket.onclose = function(evnt) {
 console.log(" websocket.onclose ");
 }; 

function say(){
 //客户端主动发消息
 websocket.send(document.getElementById('msg').value);
} 

</script>
</head>
<body>
<input type="text" value="" id="msg"><button onclick="say()"></button>
</body>
</html>

第六步测试：

package com.zsy.test.controller; 

import java.util.HashMap;
import java.util.Map; 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody; 

import com.zsy.websocket.MyMessageHandler; 

/**
 * ClassName: TestController
 * Function: TODO ADD FUNCTION.
 * date: 2017年12月14日 上午11:11:23
 * @author zhaoshouyun
 * @version
 * @since JDK 1.7
 */
@Controller
public class TestController { 

 @Autowired
 MyMessageHandler handler; 

 @RequestMapping("/get")
 public String get(){
 return "index";
 } 

 @ResponseBody
 @RequestMapping("/get1")
 public String send(String name){
 handler.sendMessageToUser("zhaoshouyun", "服务端发送的内容:"+name);
 return "success";
 } 

}

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