1.pom.xml引入jar包
<!--websocket通知--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-websocket</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-messaging</artifactId> <version>${spring.version}</version> </dependency>
2.SpringWebSocketHandlerInterceptor
package com.infore.common.websocket;
import java.util.Map;
import javax.servlet.http.HttpSession;
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;
/**
* @author Created by Caix.xu
* @desc .
* @date 2017/5/18-下午7:26
*/
public class SpringWebSocketHandlerInterceptor extends HttpSessionHandshakeInterceptor {
@Override
public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,
Map<String, Object> attributes) throws Exception {
// TODO Auto-generated method stub
System.out.println("Before Handshake");
if (request instanceof ServletServerHttpRequest) {
ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
HttpSession session = servletRequest.getServletRequest().getSession(false);
//使用userName区分WebSocketHandler,以便定向发送消息
String userName = (String) session.getAttribute("SESSION_USERNAME");
if (userName == null) {
userName = "default-system";
}
attributes.put("WEBSOCKET_USERNAME", userName);
}
return super.beforeHandshake(request, response, wsHandler, attributes);
}
@Override
public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,
Exception ex) {
// TODO Auto-generated method stub
super.afterHandshake(request, response, wsHandler, ex);
}
}
3.SpringWebSocketHandler
package com.infore.common.websocket;
import java.io.IOException;
import java.util.*;
import org.apache.log4j.Logger;
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;
/**
* @author Created by Caix.xu
* @desc .
* @date 2017/5/18-下午7:23
*/
public class SpringWebSocketHandler extends TextWebSocketHandler {
private static final Map<String, WebSocketSession> users;//这个会出现性能问题,最好用Map来存储,key用userid
private static Logger logger = Logger.getLogger(SpringWebSocketHandler.class);
static {
users = new HashMap<String, WebSocketSession>();
}
public SpringWebSocketHandler() {
// TODO Auto-generated constructor stub
}
/**
* 连接成功时候,会触发页面上onopen方法
*/
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
// TODO Auto-generated method stub
String userName = (String) session.getHandshakeAttributes().get("WEBSOCKET_USERNAME");
String sessionId = session.getId();
users.put(userName, session);
System.out.println("connect to the websocket success......当前数量:"+users.size());
//这块会实现自己业务,比如,当用户登录后,会把离线消息推送给用户
//TextMessage returnMessage = new TextMessage("你将收到的离线");
//session.sendMessage(returnMessage);
}
/**
* 关闭连接时触发
*/
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
logger.debug("websocket connection closed......");
String username= (String) session.getHandshakeAttributes().get("WEBSOCKET_USERNAME");
if(null == username){
System.out.println("用户"+username+"已退出!");
users.remove(session);
}
System.out.println("剩余在线用户"+users.size());
}
/**
* js调用websocket.send时候,会调用该方法
*/
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
System.out.println("==========="+message);
sendMessageToUsers(message);
//super.handleTextMessage(session, message);
}
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
if(session.isOpen()){session.close();}
logger.debug("websocket connection closed......");
users.remove(session);
}
public boolean supportsPartialMessages() {
return false;
}
/**
* 给某个用户发送消息
*
* @param userName
* @param message
*/
public void sendMessageToUser(String userName, TextMessage message) {
/*for (WebSocketSession user : users) {
if (user.getHandshakeAttributes().get("WEBSOCKET_USERNAME").equals(userName)) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}*/
}
/**
* 给所有在线用户发送消息
*
* @param message
*/
public void sendMessageToUsers(TextMessage message) throws IOException {
for (String map: users.keySet()) {
WebSocketSession user = users.get(map);
if (user.isOpen()) {
user.sendMessage(message);
}
}
}
}
4.SpringWebSocketConfig
package com.infore.common.websocket;
/**
* @author Created by Caix.xu
* @desc .
* @date 2017/5/18-下午7:22
*/
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
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.handler.TextWebSocketHandler;
@Configuration
@EnableWebMvc
@EnableWebSocket
public class SpringWebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer {
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(webSocketHandler(),"/websocket/socketServer.do").addInterceptors(new SpringWebSocketHandlerInterceptor());
registry.addHandler(webSocketHandler(), "/sockjs/socketServer.do").addInterceptors(new SpringWebSocketHandlerInterceptor()).withSockJS();
}
@Bean
public TextWebSocketHandler webSocketHandler(){
return new SpringWebSocketHandler();
}
}
5.WebsocketController
package com.infore.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.infore.common.websocket.SpringWebSocketHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.socket.TextMessage;
/**
* @author Created by Caix.xu
* @desc .
* @date 2017/5/18-下午7:27
*/
@Controller
@RequestMapping("websocket")
public class WebsocketController {
@Bean//这个注解会从Spring容器拿出Bean
public SpringWebSocketHandler infoHandler() {
return new SpringWebSocketHandler();
}
@RequestMapping("/login")
public ModelAndView login(HttpServletRequest request, HttpServletResponse response) throws Exception {
String username = request.getParameter("username");
System.out.println(username+"登录");
HttpSession session = request.getSession(false);
session.setAttribute("SESSION_USERNAME", username);
//response.sendRedirect("/quicksand/jsp/websocket.jsp");
return new ModelAndView("websocket");
}
@RequestMapping("/send")
@ResponseBody
public String send(HttpServletRequest request) {
String username = request.getParameter("username");
infoHandler().sendMessageToUser(username, new TextMessage("你好,测试!!!!"));
return null;
}
}
6.websocket.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="http://cdn.bootcss.com/sockjs-client/1.1.1/sockjs.js"></script>
<script type="text/javascript">
debugger;
var websocket = null;
if ('WebSocket' in window) {
websocket = new WebSocket("ws://localhost:8080/websocket/socketServer.do");
}
else if ('MozWebSocket' in window) {
websocket = new MozWebSocket("ws://localhost:8080/websocket/socketServer.do");
}
else {
websocket = new SockJS("http://localhost:8080/sockjs/socketServer.do");
}
websocket.onopen = onOpen;
websocket.onmessage = onMessage;
websocket.onerror = onError;
websocket.onclose = onClose;
function onOpen(openEvt) {
//alert(openEvt.Data);
}
function onMessage(evt) {
debugger;
alert(evt.data);
}
function onError() {}
function onClose() {}
function doSend() {
if (websocket.readyState == websocket.OPEN) {
var msg = document.getElementById("inputMsg").value;
websocket.send(msg);//调用后台handleTextMessage方法
alert("发送成功!");
} else {
alert("连接失败!");
}
}
window.close=function()
{
websocket.onclose();
}
</script>
请输入:<textarea rows="5" cols="10" id="inputMsg" name="inputMsg"></textarea>
<button onclick="doSend();">发送</button>
</body>
</html>
done;