重寫 ajax 實(shí)現(xiàn) session 超時(shí)跳轉(zhuǎn)到登錄頁(yè)面實(shí)例代碼

import java.io.IOException;
<p style="text-align: center"><img alt=""import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
<p style="text-align: center"><img alt=""public class SessionFilter implements Filter {
<p style="text-align: center"><img alt="" public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain)
 throws IOException, ServletException {
 HttpServletRequest request = (HttpServletRequest) req;
 HttpServletResponse response = (HttpServletResponse) res;
<p style="text-align: center"><img alt="" String requestUri = request.getRequestURI();
<p style="text-align: center"><img alt="" if (requestUri.indexOf("/login.html") > 0 || requestUri.indexOf("/system/login") > 0) {
 return ;
 }
<p style="text-align: center"><img alt="" HttpSession session = request.getSession(false);
<p style="text-align: center"><img alt="" if (session == null) {
 // 如果是session超時(shí)，在此處做處理。
 response.sendRedirect(request.getContextPath() + "/login.html");
 return ;
 }
 try {
 filterChain.doFilter(request, response);
 } catch (Exception e) {
 e.printStackTrace();
 }
 return ;
 }
}

<filter>
 <filter-name>sessionFilter</filter-name>
 <filter-class>com.manager.filter.SessionFilter</filter-class>
</filter>
<filter-mapping>
 <filter-name>sessionFilter</filter-name>
 <url-pattern>/manager/*</url-pattern>
</filter-mapping>

jQuery(function($){
 var _ajax=$.ajax;
 $.ajax=function(opt){
 var _success = opt && opt.success || function(a, b){};
 var _opt = $.extend(opt, {
 success:function(data, textStatus){
 _success(data, textStatus); 
 },
 error:function(XMLHttpRequest, textStatus, errorThrown){
 //alert(XMLHttpRequest.responseText);
 //如果請(qǐng)求發(fā)生錯(cuò)誤，會(huì)返回登陸頁(yè)面源代碼，如果源代碼里面存在lovnx這個(gè)字符串，前端就重定向到登陸頁(yè)面
 var reData = XMLHttpRequest.responseText + "";
 if(reData.indexOf('lovnx') != -1) {
 window.location.href="/manager/login.html" rel="external nofollow" ;
 return;
 }
 }
 });
 return _ajax(_opt);
 };
 });

<input type="hidden" value="lovnx">