websocket实时推送例子
demo基于spring框架来写的。
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：
org.springframework
spring-websocket
4.2.4.RELEASE
org.springframework
spring-messaging
4.2.4.RELEASE
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 userMap;
static {
userMap = new ConcurrentHashMap(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 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 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
/**
* 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();
}
}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 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;
}
} <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
Insert title here
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";
}
}