练习 过滤用户输入的敏感字

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<%@ 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>
<form action="NewFile3.jsp" method="post">
<input type="text" name="name">
<input type="submit" value="提交">
</form>
</body>
</html>
<%@ 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>
<%
String n=request.getAttribute("name1").toString();
%>

<input type="text" value="<%=n%>">


</body>
</html>
package com.hanqi.web;

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;

public class TestFilter1 implements Filter {

    
    public TestFilter1() {
       
    }

    
    public void destroy() {
        
    }

    
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        String str=request.getParameter("name");
        String str1=str.replaceAll("的", "*");
        request.setAttribute("name1", str1);
        System.out.println(str1);
        chain.doFilter(request, response);
    }

    
    public void init(FilterConfig fConfig) throws ServletException {
        
    }

}
  <filter>
    <display-name>TestFilter1</display-name>
    <filter-name>TestFilter1</filter-name>
    <filter-class>com.hanqi.web.TestFilter1</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>TestFilter1</filter-name>
    <url-pattern>/NewFile3.jsp</url-pattern>
  </filter-mapping>

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