filter实现登录验证，并实现页面跳转到登录前浏览的页面（同步异步皆可）_gateway的filter跳转登录页面

框架使用SSH

1、首先写好filter，如下

package com.alpha.web.filter;
 
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
 
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;
 
public class CheckLoginFilter implements Filter {
	private String redirectURL = "";
	private List<String> notCheckURLList = null;
 
	@Override
	public void destroy() {
		this.notCheckURLList.clear();
	}
 
	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest request = (Htt