1、提交页面
<%@ 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>
<form action="shuchu.jsp" method="post">
<table height="50" weight="50">
<tr align="center"><td>留言</td></tr>
<tr><td><textarea rows="10" cols="30" name="liuyan"></textarea></td></tr>
<tr><td><input type="submit" value="提交"></td></tr>
</table>
</form>
</body>
</html>
2、filter过滤代码
package lianxi;
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;
public class mingan implements Filter {
public mingan() {
}
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
String str=request.getParameter("liuyan");
String newstr=str.replaceAll("是","*");
request.setAttribute("liuyan1", newstr);
pw.print(newstr);
}
public void init(FilterConfig fConfig) throws ServletException {
}
}
3、输出页面
<%@ 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>
<%
String str=request.getParameter("liuyan1");
out.print(str);
%>
</body>
</html>
4、运行结果
