{"id":201,"date":"2016-09-21T20:15:30","date_gmt":"2016-09-21T12:15:30","guid":{"rendered":"http:\/\/www.chenweikang.top\/?p=201"},"modified":"2017-09-19T11:42:17","modified_gmt":"2017-09-19T03:42:17","slug":"%e5%ae%9e%e7%8e%b0httpsessionlistener%e5%ae%9e%e7%8e%b0%e5%8d%95%e7%82%b9%e7%99%bb%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.chenweikang.top\/?p=201","title":{"rendered":"\u5b9e\u73b0HttpSessionListener\u5b9e\u73b0\u5355\u70b9\u767b\u5f55"},"content":{"rendered":"

\u5b9e\u73b0\u539f\u7406\uff0c\u5229\u7528HttpSessionListener\u7684\u76d1\u89c6\u76d1\u542c\u529f\u80fd\u3002\u7528\u6237\u767b\u5f55\u6210\u529f\u540e\uff0c\u5728HashMap\u4e2d\u653e\u7f6e\u4e00\u7ec4sessionId\u548cuserName\u7684\u7ec4\u961f\uff0c\u5bf9HashMap\u4e2d\u7684\u952e\u503c\u4fe1\u606f\u767b\u5f55\u5b9e\u65f6\u8fdb\u884c\u7ef4\u62a4\uff0c\u5229\u7528HashMap\u6765\u5224\u65ad\u7528\u6237\u662f\u5426\u5df2\u7ecf\u767b\u5f55\uff0c\u5f53\u524d\u662f\u5426\u5728\u7ebf\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u662f\u5426\u8fdb\u884csession\uff08\u5047session\uff0c\u6307\u7684\u662fhashmap\u4e2d\u4fdd\u5b58\u7684\u952e\u503c\u4fe1\u606f\uff09\u5254\u9664\u3002<\/p><\/blockquote>\n

1\u3001\u4ee5\u4e0b\u662f\u7528\u4e8e\u7528\u6237\u767b\u5f55\u76d1\u542c\u7684SessionListener java\u6587\u4ef6\u6e90\u7801\uff1a
\npublic class SessionListener implements HttpSessionListener {
\nprivate static final Logger m_logger = Logger.getLogger(LogonAction.class);\/\/\u7528\u4e8elog4j\u8c03\u8bd5
\nprivate static HashMap hashUserName = new HashMap();\/\/\u4fdd\u5b58sessionID\u548cusername\u7684\u6620\u5c04
\n\/**\u4ee5\u4e0b\u662f\u5b9e\u73b0HttpSessionListener\u4e2d\u7684\u65b9\u6cd5**\/
\npublic void sessionCreated(HttpSessionEvent sessionEvent){
\n}<\/p>\n

public void sessionDestroyed(HttpSessionEvent sessionEvent){
\nhashUserName.remove(sessionEvent.getSession().getId());
\n}<\/p>\n

\/**
\n* isLogining-\u7528\u4e8e\u5224\u65ad\u7528\u6237\u662f\u5426\u5df2\u7ecf\u767b\u5f55
\n* @param\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sessionUserName String-\u767b\u5f55\u7684\u7528\u6237\u540d
\n* @return boolean-\u8be5\u7528\u6237\u662f\u5426\u5df2\u7ecf\u767b\u5f55\u7684\u6807\u5fd7
\n* *\/
\npublic static boolean isLogining(String sessionUserName) throws Exception{
\nreturn hashUserName.containsValue(sessionUserName);
\n}<\/p>\n

\/*
\n* isOnline-\u7528\u4e8e\u5224\u65ad\u7528\u6237\u662f\u5426\u5728\u7ebf
\n* @param session HttpSession-\u767b\u5f55\u7684\u7528\u6237\u540d\u79f0
\n* @return boolean-\u8be5\u7528\u6237\u662f\u5426\u5728\u7ebf\u7684\u6807\u5fd7
\n*\/
\npublic static boolean isOnline(HttpSession session) throws Exception{
\nreturn hashUserName.containsKey(session.getId());
\n}<\/p>\n

\/*
\n* createUserSession-\u7528\u4e8e\u5efa\u7acb\u7528\u6237session
\n* @param sessionUserName String-\u767b\u5f55\u7684\u7528\u6237\u540d\u79f0
\n*\/
\npublic static void createUserSession(HttpSession session,String sessionUserName) throws Exception {
\nhashUserName.put(session.getId(),sessionUserName);<\/p>\n

if(m_logger.isDebugEnabled()){\/\/log4j\u8c03\u8bd5\u4fe1\u606f
\nIterator debugIter = hashUserName.entrySet().iterator();
\nwhile (debugIter.hasNext()){
\nMap.Entry entry = (Map.Entry)debugIter.next();
\nObject key = entry.getKey();
\nObject val = entry.getValue();
\nm_logger.debug(sessionUserName);
\nm_logger.debug(key.toString());
\nm_logger.debug(val.toString());
\n}
\n}\/\/log4j\u8c03\u8bd5\u4fe1\u606f\u7ed3\u675f<\/p>\n

}<\/p>\n

\/*
\n* createUserSession-\u6839\u636e\u7528\u6237\u540d\u5254\u9664session
\n* @param sessionUserName String-\u767b\u5f55\u7684\u7528\u6237\u540d\u79f0
\n*\/
\npublic static void removeUserSession(String sessionUserName) throws Exception{
\nIterator iter = hashUserName.entrySet().iterator();
\nwhile (iter.hasNext()){
\nMap.Entry entry = (Map.Entry)iter.next();
\nObject key = entry.getKey();
\nObject val = entry.getValue();
\nif(((String)val).equals(sessionUserName)){
\nhashUserName.put(key,null);
\niter.remove();
\n<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/hashUserName.remove(key);\/\/\u5f53\u4f7f\u7528 fail-fast iterator \u5bf9 Collection \u6216 Map \u8fdb\u884c\u8fed\u4ee3\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u5c1d\u8bd5\u76f4\u63a5\u4fee\u6539 Collection \/ Map \u7684\u5185\u5bb9\u65f6\uff0c\u5373\u4f7f\u662f\u5728\u5355\u7ebf\u7a0b\u4e0b\u8fd0\u884c,java.util.ConcurrentModificationException \u5f02\u5e38\u4e5f\u5c06\u88ab\u629b\u51fa\u3002<\/span>
\n<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n}
\n}<\/p>\n

\/*
\n* replaceUserSession-\u7528\u6237\u5df2\u7ecf\u767b\u5f55\u5219\u8fdb\u884csession\u5254\u9664,\u5426\u5219\u5efa\u7acb\u65b0\u7684session
\n* @param sUserName String-\u767b\u5f55\u7684\u7528\u6237\u540d\u79f0
\n*\/
\npublic static void replaceUserSession(HttpSession session,String sessionUserName) throws Exception {
\nif(hashUserName.containsValue(sessionUserName)){\/\/\u5982\u679c\u8be5\u7528\u6237\u5df2\u7ecf\u767b\u5f55\u8fc7\uff0c\u5219\u4f7f\u4e0a\u6b21\u767b\u5f55\u7684\u7528\u6237\u6389\u7ebf(\u4f9d\u636e\u4f7f\u7528\u6237\u540d\u662f\u5426\u5728hashUserName\u4e2d)
\n\/\/\u904d\u5386\u539f\u6765\u7684hashUserName\uff0c\u5220\u9664\u539f\u7528\u6237\u540d\u5bf9\u5e94\u7684sessionID(\u5373\u5220\u9664\u539f\u6765\u7684sessionID\u548cusername)
\nIterator iter = hashUserName.entrySet().iterator();
\nwhile (iter.hasNext()){
\nMap.Entry entry = (Map.Entry)iter.next();
\nObject key = entry.getKey();
\nObject val = entry.getValue();
\nif(((String)val).equals(sessionUserName)){
\nhashUserName.put(key,null);
\niter.remove();
\n<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/hashUserName.remove(key);\/\/\u5f53\u4f7f\u7528 fail-fast iterator \u5bf9 Collection \u6216 Map \u8fdb\u884c\u8fed\u4ee3\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u5c1d\u8bd5\u76f4\u63a5\u4fee\u6539 Collection \/ Map \u7684\u5185\u5bb9\u65f6\uff0c\u5373\u4f7f\u662f\u5728\u5355\u7ebf\u7a0b\u4e0b\u8fd0\u884c,java.util.ConcurrentModificationException \u5f02\u5e38\u4e5f\u5c06\u88ab\u629b\u51fa\u3002
\n<\/span><\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}
\n}
\nhashUserName.put(session.getId(),sessionUserName);\/\/\u6dfb\u52a0\u73b0\u5728\u7684sessionID\u548cusername
\n}else{\/\/\u5982\u679c\u8be5\u7528\u6237\u6ca1\u767b\u5f55\u8fc7\uff0c\u76f4\u63a5\u6dfb\u52a0\u73b0\u5728\u7684sessionID\u548cusername
\nhashUserName.put(session.getId(),sessionUserName);
\n}<\/p>\n

if(m_logger.isDebugEnabled()){\/\/log4j\u8c03\u8bd5\u4fe1\u606f
\nIterator debugIter = hashUserName.entrySet().iterator();
\nwhile (debugIter.hasNext()){
\nMap.Entry entry = (Map.Entry)debugIter.next();
\nObject key = entry.getKey();
\nObject val = entry.getValue();
\nm_logger.debug(sessionUserName);
\nm_logger.debug(key.toString());
\nm_logger.debug(val.toString());
\n}
\n}\/\/log4j\u8c03\u8bd5\u4fe1\u606f\u7ed3\u675f<\/p>\n

}
\n}<\/p>\n

 <\/p>\n

2. \u6ce8\u610f\uff1a\u6700\u540e\u522b\u5fd8\u4e86\u5728web.xml\u6587\u4ef6\u4e2d\u914d\u7f6e\u76d1\u542c\u5668SessionListener:<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <listener>
\n<listener-class>com.projectsSrcPath.SessionListener<\/listener-class>
\n<\/listener><\/span><\/p>\n

 <\/p>\n

\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a\u5de6\u624b\u4ee3\u7801\u53f3\u624b\u8bd7<\/a> » \u5b9e\u73b0HttpSessionListener\u5b9e\u73b0\u5355\u70b9\u767b\u5f55<\/a><\/p>

\r\n
\r\n
~\u8c22\u8c22\u6253\u8d4f~<\/div>\r\n
<\/div>
<\/div>
<\/div><\/div>\r\n