filter（过滤不合法字符）（param）（textarea）（indexof("晕")）(form)

来源：互联网发布：厦门淘宝摄影编辑：程序博客网时间：2024/06/09 19:42

package com.javaweb;import java.io.IOException;import javax.management.modelmbean.RequiredModelMBean;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 com.sun.net.httpserver.Filter.Chain;public class FilterTest implements Filter {public void destroy() {// TODO Auto-generated method stubSystem.out.println("销毁");}public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {// TODO Auto-generated method stubHttpServletRequest request=(HttpServletRequest)arg0;ServletResponse response=(ServletResponse)arg1;FilterChain chain=(FilterChain)arg2;request.setCharacterEncoding("gb2312");String charContent=request.getParameter("charContent");if(charContent!=null){if(charContent.indexOf("晕")==-1){chain.doFilter(request, response);}else{request.getRequestDispatcher("SendFailure.jsp").forward(request, response);}}else {chain.doFilter(request, response);}}public void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stubSystem.out.println("初始化");}}

CharForm.jsp

<%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>  </head>    <body>    <formaction="ShowContent.jsp" method="post">     账号：<input type="text" name="username"/><br>    发信：<br>    <textarea name="charContent" rows="20" cols="40"></textarea><br>    <input type="submit" value="发送"/>    <input type="reset" value="重置"/>        </form>  </body></html>

SendFailure.jsp

<%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>  </head>    <body>    <h1>发言失败</h1>  </body></html>

ShowContent.jsp

<%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>  </head>    <body>    <center>    <h1>发言成功</h1>    账号：${param.username }<br>    内容：${param.charContent }<br>    </center>  </body></html>