最近做了一個項目其中有需求,要實現(xiàn)自動登錄功能,通過查閱相關(guān)資料,打算用session監(jiān)聽來做,下面給大家列出了配置監(jiān)聽器的方法:
1.在項目的web.xml文件中添加如下代碼:
1
2
3
4
|
2.編寫java類。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
public class SessionListener implements HttpSessionListener { public void sessionCreated(HttpSessionEvent arg0) { // session創(chuàng)建時執(zhí)行 SimpleDateFormat simpleFormat = new SimpleDateFormat( "mm-ss-ms" ); String nowtimes = simpleFormat.format( new Date()); User u= null ; //System.out.println("執(zhí)行。。 當(dāng)前時間:"+nowtimes+"_"+u); HttpSession ses= arg0.getSession(); String id=ses.getId()+ "_" +ses.getCreationTime(); } public void sessionDestroyed(HttpSessionEvent arg0) { // session失效時執(zhí)行 SimpleDateFormat simpleFormat = new SimpleDateFormat( "mm-ss-ms" ); String nowtimes = simpleFormat.format( new Date()); //System.out.println("session失效了。。 結(jié)束時間: "+nowtimes); } } |
配置完成后等session失效后成功進(jìn)入sessionDestroyed方法,準(zhǔn)備進(jìn)行頁面跳轉(zhuǎn)操作,突然發(fā)現(xiàn)怎么寫跳轉(zhuǎn),愣住了,繼續(xù)上網(wǎng)請教大神,發(fā)現(xiàn)這個監(jiān)聽是做一些后臺統(tǒng)計處理的,無法實現(xiàn)頁面跳轉(zhuǎn)的功能。
只能放棄這方法了,開始使用過濾器實現(xiàn)
1、web.xml中添加過濾器配置
1
2
3
4
5
6
7
8
|
<filter> <filter-name>sessionFilter</filter-name> <filter- class >com.orchestrall.web.helper.session.SessionFilter</filter- class > </filter> <filter-mapping> <filter-name>sessionFilter</filter-name> <url-pattern>/actions/*</url-pattern> </filter-mapping> |
2、新建SessionFilter類,實現(xiàn)Filter接口。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
public class SessionFilterimplements Filter { public void destroy() { // TODO Auto-generated method stub } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; HttpSession session = httpRequest.getSession(); // 登陸url String loginUrl = httpRequest.getContextPath() + "/admin/login.jsp" ; String url = httpRequest.getRequestURI(); String path = url.substring(url.lastIndexOf( "/" )); // 超時處理,ajax請求超時設(shè)置超時狀態(tài),頁面請求超時則返回提示并重定向 if (path.indexOf( ".action" ) != - 1 && session.getAttribute( "LOGIN_SUCCESS" ) == null ) { // 判斷是否為ajax請求 if (httpRequest.getHeader( "x-requested-with" ) != null && httpRequest.getHeader( "x-requested-with" ) .equalsIgnoreCase( "XMLHttpRequest" )) { httpResponse.addHeader( "sessionstatus" , "timeOut" ); httpResponse.addHeader( "loginPath" , loginUrl); chain.doFilter(request, response); // 不可少,否則請求會出錯 } else { String str = "<script language='javascript'>alert('會話過期,請重新登錄');" + "window.top.location.href='" + loginUrl + "';</script>" ; response.setContentType( "text/html;charset=UTF-8" ); // 解決中文亂碼 try { PrintWriter writer = response.getWriter(); writer.write(str); writer.flush(); writer.close(); } catch (Exception e) { e.printStackTrace(); } } } else { chain.doFilter(request, response); } } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } } |
3、客戶端JS,用于ajax請求session超時
對于jquery
1
2
3
4
5
6
7
8
9
10
11
12
|
<script type= "text/javascript" > $(document).ajaxComplete(function(event, xhr, settings) { if (xhr.getResponseHeader( "sessionstatus" )== "timeOut" ){ if (xhr.getResponseHeader( "loginPath" )){ alert( "會話過期,請重新登陸!" ); window.location.replace(xhr.getResponseHeader( "loginPath" )); } else { alert( "請求超時請重新登陸 !" ); } } }); </script> |
對于extjs的ajax請求
1
2
3
4
5
6
7
8
9
10
11
|
Ext.Ajax.on( 'requestcomplete' ,checkUserSessionStatus, this ); function checkUserSessionStatus(conn,response,options){ if (response.getResponseHeader( "sessionstatus" ) == 'timeout' ){ if (response.getResponseHeader( "loginPath" )){ alert( "會話過期,請重新登陸!" ); window.top.location.href = response.getResponseHeader( "loginPath" ); } else { alert( "請求超時請重新登陸 !" ); } } } |
如果使某個ajax請求不受全局方法的影響,那么可以在使用$.ajax()方法時,將參數(shù)中的global設(shè)置為false,jquery代碼如下:
1
2
3
4
|
$.ajax({ url: "test.html" , global: false //不觸發(fā)全局ajax事件 }) |
以上所述是小編給大家介紹的Session過期后自動跳轉(zhuǎn)到登錄頁面的實例代碼,希望對大家有所幫助,如果大家想了解更多內(nèi)容敬請關(guān)注服務(wù)器之家網(wǎng)站!