JavaWeb——允许授权的IP访问站点过滤器

来源：互联网发布：信鸽营销软件编辑：程序博客网时间：2024/06/05 20:59

1、创建一个过滤器操作类。

2、修改web.xml文件，在web.xml文件中配置过滤器的内容

3、创建相应的Jsp页面。

创建过滤器类

package com.caokaiyuan.filter;

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 IPFilter implements Filter
{
private FilterConfig config;

@Override
public void destroy()
{

}

@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest)arg0;
HttpServletResponse response = (HttpServletResponse)arg1;

//获得不过滤的IP段
String noFilterIp = config.getInitParameter("FilteredIP");
//获得客户端IP地址
String ipAddress = request.getRemoteAddr();
//截取前面部分IP字段
String ip = ipAddress.substring(0, 7);

//获取不过滤的Jsp页面
String noFilterJsp = config.getInitParameter("noFilteredJsp");
//包含不过滤的Jsp页面，通过过滤器
if (request.getRequestURI().indexOf(noFilterJsp) != -1)
{
arg2.doFilter(request, response);
return ;
}
//判断是否为可以通过的IP段
if (ip.equals(noFilterIp))
{
arg2.doFilter(request, response);
}
else
{
response.sendRedirect("error.jsp");
}
}

@Override
public void init(FilterConfig arg0) throws ServletException
{
config = arg0;
}

}

修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>FilterIP</filter-name>
<filter-class>com.caokaiyuan.filter.IPFilter</filter-class>

<init-param>

<param-name>FilteredIP</param-name>
<param-value>219.218</param-value>
</init-param>
<init-param>

<param-name>noFilteredJsp</param-name>
<param-value>error.jsp</param-value>
</init-param>
</filter>


<filter-mapping>
<filter-name>FilterIP</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

创建相关Jsp页面

success.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
欢迎登陆！！
<br>
           
           

</body>
</html>

error.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
对不起，您的IP不能访问本站点！！
<br>
           
           

</body>
</html>

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