java 登陆拦截器_java 登录拦截器

首先创建一个FilterServlet类 下面代码

package com.group.users.util;

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 javax.servlet.http.HttpSession;

import com.group.users.entity.Users;

public class FilterServlet implements Filter {

public void destroy() {

}

public void doFilter(ServletRequest req, ServletResponse res,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest) req;

HttpServletResponse response = (HttpServletResponse) res;

HttpSession session = request.getSession();

Users user = (Users) session.getAttribute("users");

if(user!=null){

chain.doFilter(request, response);

}else{

request.getRequestDispatcher("/index.jsp").forward(request, response);

}

}

public void init(FilterConfig filterConfig) throws ServletException {

}

}

下面wed代码

FilterServlet

com.group.users.util.FilterServlet

FilterServlet

/admin/*