Filter过滤指定ip地址
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Filter过滤指定ip地址
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web.xml配置
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" 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_3_0.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!--配置過濾器www為包名+MyFilter為類名--> <filter> <filter-name>MyFilter</filter-name> <filter-class>www.MyFilter</filter-class> </filter> <!--映射過濾器--> <filter-mapping> <filter-name>MyFilter</filter-name> <!--“/*”表示攔截所有的請求 --> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>servlet代碼
package www;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{@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain）throws IOException, ServletException {// TODO Auto-generated method stubHttpServletRequest request1 = (HttpServletRequest)request;HttpServletResponse response1 = (HttpServletResponse)response;String ip = request.getRemoteAddr() + "";System.out.println("the ip is"+ip);int ad = Integer.parseInt(ip.substring(ip.lastIndexOf(".") +1));if(ad >= 1 && ad <= 50){response.setContentType("text/html;charset=utf-8");//跳轉(zhuǎn)到error.jsprequest1.getRequestDispatcher("error.jsp").forward(request1, response1);}else{ chain.doFilter(request, response);}}@Overridepublic void destroy() {//TODO Auto-generated method stub}@Overridepublic void init(FilterConfig arg0) throws ServletException {//TODO Auto-generated method stubSystem.out.println("MyFilter.init(我被初始化了)");}}login.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><!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=ISO-8859-1"><title>Insert title here</title></head><body><h1>this is login page</h1></body></html>error.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><!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=ISO-8859-1"><title>Insert title here</title></head><body><h1>this is error page</h1></body></html>運行登陸界面，ip會被過濾，跳轉(zhuǎn)執(zhí)行錯誤界面內(nèi)容。
運行截圖
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