最简单使用的配置登录拦截器(过滤器)的方法(SSH)

最简单使用的配置登录拦截器(过滤器)的方法,可集成于大部分框架中首先创建loginfilter类 继承httpservlet 实现Filter接口 注意是javax.servlet包下的filter

package com.fiss.controller;

import java.io.IOException;
import java.lang.reflect.Method;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.aop.MethodBeforeAdvice;

import com.fiss.entity.Admin;

public class filter extends HttpServlet implements Filter {

    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        HttpSession session = request.getSession(true);

        String url = request.getRequestURI();
        Admin admin = (Admin) session.getAttribute("admin");
        if (admin == null && url.indexOf("login.jsp") == -1
                && !url.equals("/fiss/") && !url.equals("/fiss/admin.do")) {
            String location = "/manager/login.jsp";
            request.getRequestDispatcher(location).forward(request, response);

            System.out.println("成功拦截到外星人企图入侵网站后台   :  " + url);
            response.setHeader("Cache-Control", "no-store");
            response.setDateHeader("Expires", 0);
            response.setHeader("Pragma", "no-cache");
        } else {
            chain.doFilter(request, response);
        }
    }

    public void init(FilterConfig arg0) throws ServletException {
    }

}

package com.fiss.controller;

import java.io.IOException;
import java.lang.reflect.Method;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.aop.MethodBeforeAdvice;

import com.fiss.entity.Admin;

public class filter extends HttpServlet implements Filter {

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {

		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		HttpSession session = request.getSession(true);

		String url = request.getRequestURI();
		Admin admin = (Admin) session.getAttribute("admin");
		if (admin == null && url.indexOf("login.jsp") == -1
				&& !url.equals("/fiss/") && !url.equals("/fiss/admin.do")) {
			String location = "/manager/login.jsp";
			request.getRequestDispatcher(location).forward(request, response);

			System.out.println("成功拦截到外星人企图入侵网站后台   :  " + url);
			response.setHeader("Cache-Control", "no-store");
			response.setDateHeader("Expires", 0);
			response.setHeader("Pragma", "no-cache");
		} else {
			chain.doFilter(request, response);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
	}

}

写好以后在web.xml中配置拦截器

<filter>
        <filter-name>loginFilterfilter-name>
//这里的filterclass是你创建的fitler类
        <filter-class>com.fiss.controller.LoginFilterfilter-class>
    filter>
    <filter-mapping>
        <filter-name>loginFilterfilter-name>
//定义规则
        <url-pattern>*.jspurl-pattern>
    filter-mapping>

		loginFilter
//这里的filterclass是你创建的fitler类
		com.fiss.controller.LoginFilter
	
	
		loginFilter
//定义规则
		*.jsp
	

配置完成   启动服务器没有报错  尝试直接访问url页面  控制台成功输出拦截信息 OK