过滤器的使用 - Java编程

正在装载数据……

首先写好类:它继承

ackage shop;

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 MyFilter implements Filter {

protected FilterConfig filterConfig;

public void init(FilterConfig arg0) throws ServletException {

filterConfig = arg0;

}

public void doFilter(ServletRequest arg0, ServletResponse arg1,

FilterChain arg2) throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest) arg0;

HttpServletResponse response = (HttpServletResponse) arg1;

String tag=(String)request.getSession().getAttribute("isLog");

if((tag!=null)&&(tag.equals("ok")))

{

arg2.doFilter(arg0, arg1);

}

else

{

System.out.println("被拦截一个未认证的请求");

response.sendRedirect("/web/form/login.jsp");

}

public void destroy() {

filterConfig = null;

}

public void setFilterConfig(FilterConfig filterConfig) {

this.filterConfig = filterConfig;

}

接下来就是在web.xml中配置就可以了:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<filter-name>MyFilter</filter-name>

<filter-class>shop.MyFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>MyFilter</filter-name>

<url-pattern>/form/shopping.jsp</url-pattern>

</filter-mapping>

<filter-mapping>

<filter-name>MyFilter</filter-name>

<url-pattern>/form/checkout.jsp</url-pattern>

</filter-mapping>

本文来源：http://blog.csdn.net/stonesleebo/archive/2007/03/30/1546105.aspx

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