1.环境
springMVC+spring+mybatis（spring4.0以上）
注意需要导入spring-websocket和websocket-api包。其余架包正常ssm即可，可自行百度
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-websocket</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.websocket</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>1.1</version>
<scope>provided</scope>
</dependency>2.后台代码
用Map存放当前登录的账户及其对应的session
提出几点解释：
- @ServerEndpoint：把当前类变成websocket服务类
- @OnOpen： 连接时执行
- @OnClose：关闭时执行
- @OnMessage：收到消息时执行
- @OnError：连接错误时执行
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @Description: 简单websocket demo *
*/
@ServerEndpoint(value = "/websocketTest/{userId}")//@ServerEndpoint把当前类变成websocket服务类
public class WebsocketTest {
private Logger logger = LoggerFactory.getLogger(WebsocketTest.class);
private static String userId;
// 连接的用户
private static Map<String, Session> onlines = new HashMap<String, Session>();
// 连接时执行
@OnOpen
public void onOpen(@PathParam("userId") String userId, Session session) throws IOException {
this.userId = userId;
onlines.put(userId, session);
System.out.println("新连接：" + userId);
}
// 关闭时执行
@OnClose
public void onClose(@PathParam("userId") String userId) {
if (onlines.containsKey(userId)) {
onlines.remove(userId);
}
System.out.println("连接close：" + this.userId + " 关闭");
}
// 收到消息时执行
@OnMessage
public void onMessage(String message, Session session, @PathParam("userId") String userId) throws IOException {
System.out.println(message);
if (message.contains("&")) {
String[] params = message.split("&");
if (params[1].equals("all")) {
System.out.println("广播");
sendMessageToAll(userId + "发送广播消息:" + params[0]);
} else {
System.out.println("toUser");
sendMessageToUser(userId, params[1], params[0]);
;
}
}else
session.getBasicRemote().sendText(userId+"发送消息： " + message);
System.out.println(onlines.toString());
}
// 连接错误时执行
@OnError
public void onError(Session session, Throwable error) {
System.out.println("用户id为：" + this.userId + "的连接发送错误");
error.printStackTrace();
}
/**
* 广播消息给所有人
* **/
private void sendMessageToAll(String message) {
Set<String> users = onlines.keySet();
for (String user : users) {
try {
if (onlines.get(user).isOpen()) {
((Session) onlines.get(user)).getBasicRemote().sendText(message);
}
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
/******
* 给某个用户发送消息
* @Param userName 发消息的name
* **/
private void sendMessageToUser(String userName, String receiveName, String message) {
Set<String> users = onlines.keySet();
for (String user : users) {
if (user.equals(receiveName)) {
try {
if (onlines.get(user).isOpen()) {
System.out.println("user---" + user);
((Session) onlines.get(user)).getBasicRemote().sendText(userName + "给你发了消息：" + message);
}
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
}
3.html
一、操作类html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
广播消息---- admin
<br />
<input id="text" type="text" />
<button onclick="send()">Send</button>
<select id="toUser" >
<option id="toUser" value="all">ALL</option>
<option id="toUser" value="user001">user001</option>
<option id="toUser" value="user002">user002</option>
</select>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
<script type="text/javascript">
//判断当前浏览器是否支持WebSocket
if ('WebSocket' in window) {
websocket = new WebSocket(
"ws://localhost:8088/IM/websocketTest/admin");
console.log("link success")
} else {
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function() {
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event) {
setMessageInnerHTML("open");
}
console.log("-----")
//接收到消息的回调方法
websocket.onmessage = function(event) {
setMessageInnerHTML(event.data);
}
//连接关闭的回调方法
websocket.onclose = function() {
setMessageInnerHTML("close");
}
//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function() {
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket() {
websocket.close();
}
//发送消息
function send() {
var message = document.getElementById('text').value;
var user = document.getElementById('toUser').value;
message+='&'+user;
websocket.send(message);
}
</script>
</body>
</html>
二、接收类1
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
websocket Demo---- user001
<br />
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
<script type="text/javascript">
//判断当前浏览器是否支持WebSocket
if ('WebSocket' in window) {
websocket = new WebSocket(
"ws://localhost:8088/IM/websocketTest/user001");
console.log("link success")
} else {
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function() {
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event) {
setMessageInnerHTML("open");
}
console.log("-----")
//接收到消息的回调方法
websocket.onmessage = function(event) {
setMessageInnerHTML(event.data);
}
//连接关闭的回调方法
websocket.onclose = function() {
setMessageInnerHTML("close");
}
//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function() {
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket() {
websocket.close();
}
//发送消息
function send() {
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</body>
</html>
三、接收类2
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
websocket Demo---- user002
<br />
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
<script type="text/javascript">
//判断当前浏览器是否支持WebSocket
if ('WebSocket' in window) {
websocket = new WebSocket(
"ws://localhost:8088/IM/websocketTest/user002");
console.log("link success")
} else {
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function() {
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event) {
setMessageInnerHTML("open");
}
console.log("-----")
//接收到消息的回调方法
websocket.onmessage = function(event) {
setMessageInnerHTML(event.data);
}
//连接关闭的回调方法
websocket.onclose = function() {
setMessageInnerHTML("close");
}
//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function() {
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket() {
websocket.close();
}
//发送消息
function send() {
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</body>
</html>
4.具体效果
截图如下，实现简单web聊天功能。