java 登录拦截器

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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

<filter>
<filter-name>FilterServlet</filter-name>
<filter-class>com.group.users.util.FilterServlet</filter-class>
</filter>
<filter-mapping>
<filter-name>FilterServlet</filter-name>
<url-pattern>/admin/*</url-pattern>
</filter-mapping>

java 登录拦截器

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原文地址：http://www.cnblogs.com/fangshao/p/5545945.html