項目須要作一個自動登出的功能,查詢了網上的資料,一開始準備用session監聽作,按照下面方式配置監聽器 javascript
1.在項目的web.xml文件中添加以下代碼: html
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<!--添加Session監聽器-->
<listener>
<listener-class> 監聽器路徑 </listener-class>
</listener>
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2.編寫java類。 java
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public class SessionListener implements HttpSessionListener {
public void sessionCreated(HttpSessionEvent arg0) {
// session建立時執行 SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");
String nowtimes = simpleFormat.format(new Date());
User u=null;
//System.out.println("執行。。 當前時間:"+nowtimes+"_"+u); HttpSession ses= arg0.getSession();
String id=ses.getId()+"_"+ses.getCreationTime();
}
public void sessionDestroyed(HttpSessionEvent arg0) {
// session失效時執行 SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");
String nowtimes = simpleFormat.format(new Date());
//System.out.println("session失效了。。 結束時間: "+nowtimes); }
}
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配置完成後等session失效後成功進入sessionDestroyed方法,準備進行頁面跳轉操做,忽然發現怎麼寫跳轉,愣住了,繼續上網請教大神,發現這個監聽是作一些後臺統計處理的,沒法實現頁面跳轉的功能。 jquery
只能放棄這方法了,開始使用過濾器實現 web
一、web.xml中添加過濾器配置 ajax
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<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>
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二、新建SessionFilter類,實現Filter接口。 session
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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();
// 登錄url String loginUrl = httpRequest.getContextPath() + "/admin/login.jsp";
String url = httpRequest.getRequestURI();
String path = url.substring(url.lastIndexOf("/"));
// 超時處理,ajax請求超時設置超時狀態,頁面請求超時則返回提示並重定向 if (path.indexOf(".action") != -1
&& session.getAttribute("LOGIN_SUCCESS") == null) {
// 判斷是否爲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,不然請求會出錯 } else {
String str = "<script language='javascript'>alert('會話過時,請從新登陸');"
+ "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 }
}
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三、客戶端JS,用於ajax請求session超時 app
對於jquery jsp
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<script type="text/javascript">
$(document).ajaxComplete(function(event, xhr, settings) {
if(xhr.getResponseHeader("sessionstatus")=="timeOut"){
if(xhr.getResponseHeader("loginPath")){
alert("會話過時,請從新登錄!");
window.location.replace(xhr.getResponseHeader("loginPath"));
}else{
alert("請求超時請從新登錄 !");
}
}
});
</script>
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對於extjs的ajax請求 ide
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Ext.Ajax.on('requestcomplete',checkUserSessionStatus, this);
function checkUserSessionStatus(conn,response,options){
if(response.getResponseHeader("sessionstatus") == 'timeout'){
if(response.getResponseHeader("loginPath")){
alert("會話過時,請從新登錄!");
window.top.location.href = response.getResponseHeader("loginPath");
}else{
alert("請求超時請從新登錄 !");
}
}
}
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若是使某個ajax請求不受全局方法的影響,那麼能夠在使用$.ajax()方法時,將參數中的global設置爲false,jquery代碼以下:
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$.ajax({
url:"test.html",
global:false//不觸發全局ajax事件})
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