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登录超时给出提示跳到登录页面(ajax、导入、导出)

程序员文章站 2022-08-10 17:17:35
一、一般页面登录超时验证,可以用过滤器filter,如下: package com.lg.filter; import java.io.ioexceptio...

一、一般页面登录超时验证,可以用过滤器filter,如下:

package com.lg.filter;
import java.io.ioexception;
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 com.lg.func.myfunc;
public class loginfilter implements filter{
public void destroy() {
}
public void dofilter(servletrequest request, servletresponse response,
filterchain chain) throws servletexception, ioexception {
httpservletrequest request1=(httpservletrequest)request;
httpservletresponse response1=(httpservletresponse)response;
chain.dofilter(request, response);//放行。让其走到下个链或目标资源中
string url=request1.getservletpath();
system.out.println("demo1过滤前"+url);
myfunc myfunc = new myfunc(request1,response1);
system.out.println("demo1过滤前"+url.startswith("/index/"));
if(myfunc.checklogin2()&&!url.startswith("/index/")){
response1.sendredirect("/index_login.html");
}
system.out.println("demo1过滤后");
}
public void init(filterconfig arg0) throws servletexception {
// todo auto-generated method stub
system.out.println("===========init========过滤后");
}
}

web.xml配置

<filter>
<filter-name>demo1filter</filter-name>
<filter-class>com.lg.filter.loginfilter</filter-class>
</filter>
<filter-mapping>
<filter-name>demo1filter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping> 

二、ajax提交

提交页面,我的页面提示弹出框架用的asyncbox,可以改成其他的跳转

$.ajax({
type: "post",
url:"a.jsp",
async:false,//同步
data:{"name":"fdgh"}
success:function(msg){
//checklogin2(msg)判断是否登录超时,超时返回false,跳到登录页面
if(checklogin2(msg)){
var obj=eval('('+msg+')');
if(obj.result.indexof("suc")>-1){
alert("成功");
}else{
alert("失败");
}
}
});
//是否登录超时,超时返回false,跳到登录页面
function checklogin2(msg){
if(msg!=null&&msg.length>0){
if(msg.indexof("doctype")>-1){
checklogin();
return false;
}
}
return true;
}
function checklogin(){
if(window.top != window.self){
top.asyncbox.alert('登录超时,请重新登录', '提示', function(action){ 
top.location.href='/login.jsp';
}); 
}else{
asyncbox.alert('登录超时,请重新登录', '提示', function(action){
window.location.href='/login.jsp';
}); 
}
}

后台:

1.处理数据前

if(checklogin())return; 
//检查登录,session过期,或者未登录,自动跳转
public boolean checklogin() throws ioexception{
boolean result = false;
string html = "";
nativeobject u = sessionmng.getcurrentuser(request);//检验是否登录超时
if (u == null){
html = "<!doctype html public '-//w3c//dtd html 4.01 transitional//en' 'http://www.w3.org/tr/html4/loose.dtd'>\n" +
"<script type='text/javascript' src='/admin/js/jquery.min.js'></script>\n" +
"<script type='text/javascript' src='/admin/js/common.js'></script>\n" + 
"<script type='text/javascript' src='/admin/js/dialog/asyncbox.js'></script>\n" + 
"<script language=javascript>checklogin();</script>\n";
response.getwriter().println(html); 
result = true;
}
return result;
}

三、异步导入excel

用ajaxupload.js导入excel功能

前端提交页面参考上面的;

后台处理页面:

if(!islogin()){
response.getwriter().print("doctype");
return ;
}
//是否登录
public boolean islogin(){
nativeobject u = sessionmng.getcurrentuser(request);
if (u != null){
return true;
}else{
return false;
}
}

四。用window.open导出excel文件

后台同二

前端导出页面

function export_excel(){ 
$.ajax({
type: "post",
url:"/admin/inc/checklogin.jsp",
async:false,//同步
success:function(msg){
if(checklogin2(msg)){
window.open("perfm_excel.jsp?"+$('#form1').serialize());
}
}
}); 
login.jsp
<%@ page contenttype="text/html; charset=utf-8"%>
<%
//========================当前登陆用户信息========================================
if(checklogin())return;
%> 

以上内容给大家介绍了登录超时给出提示跳到登录页面(ajax、导入、导出)的相关知识,希望对大家有所帮助!