过滤器链实现中文转码和文字屏蔽功能

来源：互联网发布：怎么修改淘宝会员名编辑：程序博客网时间：2024/06/10 19:22

编写一个过滤器链实现如下功能：

1．编写过滤器程序EncodingFilter，实现POST方式下的中文转码。

2．编写过滤器程序liuyanfilter，实现将用户输入的用户名“张”转换成“李”，将用户输入的留言内容“剑桥”转换成“****”。

程序其他功能页面：

1．编写liuyanform.jsp该页面用于完成表单的输入，其中包括：用户名、留言内容、提交按钮。

2．编写liuyanservlet在该程序中的doPost（）方法中使用请求转发的形式将程序跳转到liuyanresult.jsp

3．编写liuyanresult.jsp程序，在该页面中输出用户提交的用户名及留言内容。

注：两个过滤器程序均对liuyanservlet程序进行过滤

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><html>  <head>  </head>    <body><form action="MessageServlet" method="post"><table><tr><td>标题：<input type="text" name="title" size="30"></td></tr><tr><td>内容：<textarea rows="5" cols="40" name="content"></textarea></td></tr><tr><td><input type="submit" name="submit" value="提交"></td></tr></table></form>  </body></html>

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%><html><head></head><body>用户名 ：<%=request.getAttribute("title")%><br/>留言信息：<%=request.getAttribute("content")%></body></html>

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"><filter><filter-name>CharacterFilter</filter-name><filter-class>com.mars.filter.CharacterFilter</filter-class></filter><filter><filter-name>WordFilter</filter-name><filter-class>com.mars.filter.WordFilter</filter-class></filter><filter-mapping><filter-name>CharacterFilter</filter-name><url-pattern>/MessageServlet</url-pattern></filter-mapping><filter-mapping><filter-name>WordFilter</filter-name><url-pattern>/MessageServlet</url-pattern></filter-mapping><servlet><servlet-name>MessageServlet</servlet-name><servlet-class>com.mars.servlet.MessageServlet</servlet-class></servlet><servlet-mapping><servlet-name>MessageServlet</servlet-name><url-pattern>/MessageServlet</url-pattern></servlet-mapping><welcome-file-list><welcome-file>submit.jsp</welcome-file></welcome-file-list></web-app>

package com.mars.filter;import java.io.IOException;import java.io.UnsupportedEncodingException;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.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;public class CharacterFilter implements Filter {public void init(FilterConfig arg0) throws ServletException {System.out.println("调用init");}public void destroy() {System.out.println("调用destroy");}// 解决post方式的乱码问题public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) resp;request.setCharacterEncoding("GBK");response.setCharacterEncoding("GBK");response.setContentType("text/html;charset=GBK");chain.doFilter(request, response);//chain.doFilter(req, resp);}}

package com.mars.filter;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.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;public class WordFilter implements Filter {private FilterConfig config = null;public void init(FilterConfig filterConfig) throws ServletException {}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest req=(HttpServletRequest)request;HttpServletResponse resp=(HttpServletResponse)response;String title = req.getParameter("title");String content = req.getParameter("content");title = title.replace("张", "李");content = content.replace("剑桥", "****");req.setAttribute("title", title);req.setAttribute("content", content);chain.doFilter(request, response);}public void destroy() {config = null;}}

package com.mars.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class MessageServlet extends HttpServlet {/*public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}*/public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.getRequestDispatcher("result.jsp").forward(request,response);}}