1.服务端
1.1.pom.xml
<dependency>
<groupId>javax.websocket</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>1.1</version>
</dependency>
1.2.WebSocketServer
使用@ServerEndpoint注解
package com.fracong.test.server;
import javax.websocket.CloseReason;
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;
@ServerEndpoint("/test/ws/{user_name}")
public class WebSocketServer {
private String userName;
private Session session;
/**
* To execute when it connected
* @param user
* @param session
*/
@OnOpen
public void onOpen(@PathParam("user_name") String userName, Session session) {
this.userName = userName;
this.session = session;
WebSocketUtils.serverClients.put(session.getId(), this);
}
/**
* To execute when get message
* @param message
* @param session
* @return
*/
@OnMessage
public String onMessage(String message, Session session) {
System.out.println(this.userName + "：" + message);
return this.userName + "：" + message;
}
/**
* To execute when closed the connector
* @param session
* @param closeReason
*/
@OnClose
public void onClose(Session session, CloseReason closeReason) {
WebSocketUtils.serverClients.remove(session.getId());
System.out.println(String.format("Session %s closed because of %s", session.getId(), closeReason));
}
/**
* To execute when an error occurs
* @param t
*/
@OnError
public void onError(Throwable t) {
t.printStackTrace();
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Session getSession() {
return session;
}
public void setSession(Session session) {
this.session = session;
}
}
1.3.WebSocketUtils
使用WebSocketUtils来进行message的发送。
package com.fracong.test.server;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.websocket.Session;
public class WebSocketUtils {
public static final Map<String, MpsWsServer> serverClients = new ConcurrentHashMap<String, MpsWsServer>();
public static Boolean sendMessageByUser(String userName, String text) {
try {
for (MpsWsServer server : serverClients.values()) {
if(userName.equals(server.getUserName()) && server.getSession() != null
&& server.getSession().isOpen()){
server.getSession().getAsyncRemote().sendText(text);
}
}
} catch (Exception e) {
}
return false;
}
public static void sendAllMessage(String text) {
for (MpsWsServer server : serverClients.values()) {
if (server.getSession() != null && server.getSession().isOpen()) {
server.getSession().getAsyncRemote().sendText(text);
}
}
}
}
2.客户端
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>WebSocket Client</title>
<script type="text/javascript" language="javascript">
var websocket;
function init()
{
output = document.getElementById("output");
}
function send()
{
var wsUri = "ws://localhost:8080/test-demo/test/ws/demo";
writeToScreen("Connecting to : "+ wsUri);
websocket = new WebSocket(wsUri);
websocket.onopen = function(evt)
{
writeToScreen("Connect Success!");
doSend(document.getElementById("textID").value);
};
websocket.onmessage = function(evt)
{
writeToScreen("Received Message: "+ evt.data);
websocket.close();
};
websocket.onerror = function (evt)
{
writeToScreen('<span style="color:red;">ERROR:</span>'+evt.data);
};
}
function doSend(message)
{
websocket.send(message);
writeToScreen("Send Message : "+message);
}
function writeToScreen(message)
{
var pre = document.createElement("p");
pre.style.wordWrap = "break-word";
pre.innerHTML = message;
output.appendChild(pre)
}
window.addEventListener("load", init, false);
</script>
</head>
<body>
<h1>WebSocket Client</h1>
<div style="text-align:left;">
<form action="">
<input onclick="send()" value="Send Message" type="button">
<input id="textID" name="message" value="Hello Web Socket" type="text">
<br>
</form>
</div>
<div id="output"></div>
</body>
</html>
如果使用长链接，那么websocket.close()不需要进行关闭，同时也不需要每次点击send的时候，new一个新的WebSocket。