一個用戶名和一個留言框的JSP頁面：
?
非常挫的界面 見諒
一個過濾器類，用于過濾名字中出zhangsan并將它換成lisi 以及留言中出現zhongguo的字眼并將它替換成****
一個Servlet類用于接收過濾后的
一個顯示結果的JSP頁面
web.xml中的配置
顯示結果分別為：
?
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>My JSP 'CommentLogin.jsp' starting page</title>
</head>
<body>
<form action="CommentServlet">
username:<input type="text" name="username"><br>
Comment:<textarea name="comment" rows="7" cols="7"></textarea>
<input type="submit" value="submit">
</form>
</body>
</html>
非常挫的界面 見諒
一個過濾器類，用于過濾名字中出zhangsan并將它換成lisi 以及留言中出現zhongguo的字眼并將它替換成****
package FilterPackege;
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 CommentFilter implements Filter{
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse resp=(HttpServletResponse)response;
String username=req.getParameter("username");
String comment=req.getParameter("comment");
username=username.replace("zhangsan", "lisi");
comment =comment.replace("zhongguo", "****");
req.setAttribute("username",username);
req.setAttribute("comment", comment);
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("CommentFilter Start");
}
}
一個Servlet類用于接收過濾后的
package com.mison;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CommentServlet extends HttpServlet {
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=(String)request.getAttribute("username");
String comment=(String)request.getAttribute("comment");
request.getRequestDispatcher("commentout.jsp").forward(request, response);
}
}
一個顯示結果的JSP頁面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>My JSP 'commentout.jsp' starting page</title>
</head>
<body>
username:<%=request.getAttribute("username") %><br>
comment:<%=request.getAttribute("comment") %>
</body>
</html>
web.xml中的配置
<filter>
<filter-name>CommentFilter</filter-name>
<filter-class>FilterPackege.CommentFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CommentFilter</filter-name>
<url-pattern>/CommentServlet</url-pattern>
</filter-mapping>
顯示結果分別為：
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