说明:
以下代码运行环境:jdk1.4,工具JBuilder2005,Servlet2.4,JSP2.0
红色标记为关键代码.由于工程太大,我在这里只放有XML文件、JSP文件、过滤器
具体内容用论坛回复。 顺序为：JSP文件---过滤器---XML文件.
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%
Object str= request.getAttribute("user");
pageContext.setAttribute("user",str);
%>
<html>
<head>
<title>
过滤器
</title>
</head>
<body bgcolor="#ffffff">
<h1>
准备过滤
</h1>
<h1>${pageScope.user}</h1>
<form method="post" action="Example1.jsp">
<br>
<input type="text" name="user" />
<br>
<input type="submit" name="Submit" value="Submit">
<input type="reset" value="Reset">
</form>
</body>
</html>
文字
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%
Object str= request.getAttribute("user");
pageContext.setAttribute("user",str);
%>
<html>
<head>
<title>
过滤器
</title>
</head>
<body bgcolor="#ffffff">
<h1>
准备过滤
package com.lgx.filtertext.dao;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class Filter1 extends HttpServlet implements Filter {
private FilterConfig filterConfig;
//Handle the passed-in FilterConfig
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
//Process the request/response pair
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) {
String[] strUser = {"江泽民同志", "胡锦涛同志", "奶奶的", "我拷", "他XX的"};
String str = "";
try {
request.setCharacterEncoding("GBK");
HttpServletRequest hsrq = (HttpServletRequest) request;
String user = hsrq.getParameter("user");
if (user == null || user.equals("")) {
} else {
StringBuffer sb = new StringBuffer(user);
for (int i = 0; i < strUser.length; i++) {
str = strUser[i];
if (sb.indexOf(str) == -1) {
hsrq.setAttribute("user", sb.toString());
} else {
sb.replace(sb.indexOf(str), sb.indexOf(str) + 3, "xxx");
hsrq.setAttribute("user", sb.toString());
}
}
}
filterChain.doFilter(request, response);
} catch (ServletException sx) {
filterConfig.getServletContext().log(sx.getMessage());
} catch (IOException iox) {
filterConfig.getServletContext().log(iox.getMessage());
}
}
//Clean up resources
public void destroy() {
}
}
注：此“XML”代码是在运行时出现的，
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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" version="2.4">
<display-name>Web</display-name>
<filter>
<filter-name>filter1</filter-name>
<filter-class>com.lgx.filtertext.dao.Filter1</filter-class>
</filter>
<filter-mapping>
<filter-name>filter1</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<description>Added by JBuilder to compile JSPs with debug info</description>
<servlet-name>debugjsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<init-param>
<param-name>classdebuginfo</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>3</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>debugjsp</servlet-name>
<url-pattern>*.jsp</url-pattern>
</servlet-mapping>
</web-app>
注：这一处代码是配置过滤器的，不过JBuilder2005里面Tomcat容器已自动配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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" version="2.4">
<display-name>Web</display-name>
<filter>
<filter-name>filter1</filter-name>
<filter-class>com.lgx.filtertext.dao.Filter1</filter-class>
</filter>
<filter-mapping>
<filter-name>filter1</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
相关JSP过滤器实现---论坛不文明语过滤功能