jsp登陆访问跳转

未登陆，禁止访问任何页面，自动跳转到登陆页
package com.catalogeasy.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;
public class LoginFilter implements Filter {
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest httprequest = (HttpServletRequest) arg0;
HttpServletResponse httpresponse = (HttpServletResponse) arg1;
String temp = httprequest.getServletPath();
if(httprequest.getSession().getAttribute("user")==null){
if("/jdom.do".equals(temp)||"/login.do".equals(temp)){
arg2.doFilter(arg0, arg1);
}else{
httpresponse.sendRedirect("/CatalogUser");
}
}else{
arg2.doFilter(arg0, arg1);
}
/*if(httprequest.getSession().getAttribute("user")==null&&((!"/jdom.do".equals(temp))||(!"/login.do".equals(temp)))){
httpresponse.sendRedirect("/CatalogUser/user/login.jsp");
}else{
arg2.doFilter(arg0, arg1);
}*/
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
      2.登陆后跳转到请求页面
import java.io.IOException;
import java.net.URLEncoder;
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