WebLogic 12c(12.2.1.4) 기준으로
웹로직 기반 웹소켓을 구현
1. 웹로직용 웹소켓이 들어있는 jar
<경로>/oracle/wls12214/wlserver/server/lib/api.jar
2. 서버 웹소켓 클래스 작성
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint("/ws/echo")
public class WsEchoEndPoint {
/**
* 클라이언트가 연결 시도했을 시
*
* @param session
* @throws IOException
*/
@OnOpen
public void onOpen(Session session) {
System.out.println("Session on open!");
}
/**
* 클라리언트로부터 받은 메시지
*
* @param message
* @return
*/
@OnMessage
public String onMessage(String message) {
System.out.println("Session receive message: " + message);
return "ping".equals(message) ? "pong" : message;
}
/**
* 에러
*
* @param t
*/
@OnError
public void onError(Session session, Throwable t) {
t.printStackTrace();
}
/**
* 세션 닫힘
*
* @param session
*/
@OnClose
public void onClose(Session session) {
System.out.println("Session on close!");
}
}
3. 클라이언트 웹소켓 자바스크립트 작성
<!doctype html>
<html lang="ko">
<head>
<meta charset="utf-8">
<title>WebSocket Test</title>
</head>
<body>
<div id="console"></div>
<script type="text/javascript">
var ws;
function goOpen() {
if (ws != null && ws.readyState != WebSocket.CLOSED) {
goClose();
}
ws = new WebSocket('ws://localhost:7001/ws/echo');
ws.onopen = function() {
goKeepAlive();
console.log('websocket opened.');
};
ws.onmessage = function(message) {
if (message.data != 'pong') {
$('#console').append(message.data);
}
};
ws.onclose = function(event) {
console.log('websocket closed : ', event);
};
}
function goKeepAlive() {
if (ws != null && ws.readyState == WebSocket.OPEN) {
ws.send('ping');
console.log('websocket keepAlive.');
setTimeout(goKeepAlive, 5000);
}
}
function goClose() {
if (ws != null && ws.readyState != WebSocket.CLOSED) {
ws.close();
console.log('websocket closed.');
}
}
</script>
</body>
</html>
4. web.xml 수정 - async-supported 태그 추가
async-supported 태그가 없을 경우 웹소켓 수행 시 "The async-support is disabled on this request"와 같은 에러가 발생한다.
async-supported 태그 추가할 때 아래 예제와 같은 순서에 있어야 한다.
그렇지 않으면 WAS 구동 시 에러가 발생한다.
<!-- 필터가 있을 경우 -->
<filter>
<filter-name>...</filter-name>
<filter-class>...</filter-class>
<async-supported>true</async-supported>
<init-param>
...
</init-param>
</filter>
<!-- 서블릿이 있을 경우 -->
<servlet>
<servlet-name>...</servlet-name>
<servlet-class>...</servlet-class>
<init-param>
...
</init-param>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>
참고사이트
https://docs.oracle.com/middleware/1221/wls/WLPRG/websockets.htm#WLPRG805
18 Using the WebSocket Protocol in WebLogic Server
In WebLogic Server, you deploy a WebSocket application as a Web application archive (WAR), either as a standalone Web application or a WAR module within an enterprise application. Therefore, many security practices that you apply to securing Web applicatio
docs.oracle.com
끝.
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