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使用Java程序过滤网页中的一些敏感字符

2014-01-04 23:31 525 查看

import java.io.CharArrayWriter;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
public class Ct extends HttpServletResponseWrapper {
private CharArrayWriter output;
// 重写tostring方法
public String toString() {
return output.toString();
}
public Ct(HttpServletResponse response) {
super(response);
this.output=new CharArrayWriter();
}
public PrintWriter getWriter(){
return new PrintWriter(output);
}
}
//过滤器
import java.io.IOException;
import java.io.PrintWriter;
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.HttpServlet;
import javax.servlet.http.HttpServletResponse;
public class HtmlFilter extends HttpServlet implements Filter{

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
//设置响应编码
response.setCharacterEncoding("UTF-8");
PrintWriter out=response.getWriter();
Ct ct=new Ct((HttpServletResponse)response);
//执行下一步
chain.doFilter(request, ct);
String resStr=ct.toString().trim();
String newStr="";
if(resStr.contains("杂种儿")){
newStr=resStr.replaceAll("杂种儿", "***");
}
out.print(newStr);
}
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
//xml配置
<?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"> <welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- 配置过滤器 -->
<filter>
<filter-name>ecodeing</filter-name>
<filter-class>HtmlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ecodeing</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
</web-app>
//jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
你家吗 杂种儿
</body>
</html>

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标签： java jsp filter

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