整站过滤器代码,Java代码库,德仔网

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【Java】整站过滤器
作者:Dezai.CN / 发布于2011/6/10/ 1211
<div>**
* @author 
* @company leemenz (C) copyright
* @time Dec 18, 2006 2:08:18 PM
* @version 1.0.0.0
* @package com
*/
package com;</div>
import java.io.IOException;
import java.io.PrintWriter;</div>
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;</div>
<div>/**
* @author Administrator
* 
* 这个过滤器用来过滤黑名单中的用户不能留言
* 
*/
public class NoteFilter implements Filter {</div>
<div>private FilterConfig config = null;</div>
<div>private String blackList = null;</div>
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
config = null;
}
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
* javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response,
 FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
String username = request.getParameter("username");
if (username != null)
 username = new String(request.getParameter("username").getBytes(
 "ISO8859-1"), "GB2312");
if (username != null && username.indexOf(blackList) != -1) {
 response.setContentType("text/html;charset=GB2312");
 PrintWriter out = response.getWriter();
 out.println("<html><head></head><body>");
 out.println("<h1>对不起，" + username + ",您没有留言的权限！");
 out.println("</h1></body></html>");
 out.flush();
 return;
}
<div>long before = System.currentTimeMillis();
config.getServletContext()
 .log("NoteFilter:before call chain.Filter();");
chain.doFilter(request, response);
config.getServletContext().log("NoteFilter:after call chain.Filter();");
long end = System.currentTimeMillis();
String name = "";
if (request instanceof javax.servlet.http.HttpServletRequest) {
 name = ((HttpServletRequest) request).getRequestURI();
}
config.getServletContext().log(
 "NoteFilter " + name + " : " + (end - before) + " ms");
}
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
this.config = arg0;
this.blackList = config.getInitParameter("blackList");
}
<div>}
<div>
/**
* @author 
* @company leemenz (C) copyright
* @time Dec 18, 2006 2:08:18 PM
* @version 1.0.0.0
* @package com
*/
package com;</div>
import java.io.IOException;</div>
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;</div>
<div>/*
*测试页面
*/
public class NoteServlet extends HttpServlet {</div>
<div>public static final String CONTENT_TYPE = "text/html;charset=GB2312";</div>
<div>/**
* Constructor of the object.
*/
public NoteServlet() {
super();
}
<div>/**
* Destruction of the servlet. 
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
<div>/**
* The doDelete method of the servlet. 
* 
* This method is called when a HTTP delete request is received.
* 
* @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 doDelete(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException {</div>
<div>// Put your code here
}
<div>/**
* The doGet method of the servlet. 
* 
* 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 {</div>
<div>response.setContentType(CONTENT_TYPE);
ServletOutputStream out = response.getOutputStream();
out
 .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>留言簿</TITLE></HEAD>");
out.println(" <BODY>");</div>
<div>String name = request.getParameter("username");
String content = request.getParameter("content");</div>
if (name != null)
 name = new String(name.getBytes("ISO-8859-1"), "GB2312");
if (content != null)
 content = new String(content.getBytes("ISO-8859-1"), "GB2312");</div>
if (content != null)
 out.println(" " + name + "的留言为：" + content);</div>
<div>out.println("<form method=\"post\" action=\""
 + request.getContextPath() + "/servlet/NoteServlet\">");
out.println("<b>姓名：</b><input type=\"text\" name=\"username\">");
out
 .println("<b>内容：</b><textArea name=\"content\" row=\"5\" cols=\"20\"　wrap></textArea>");
out.println("<input type=\"submit\" name=\"提交\" value=\"提交\">");
out.println("<input type=\"reset\" name=\"重填\" value=\"重填\">");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
<div>/**
* The doPost method of the servlet. 
* 
* This method is called when a form has its tag value method equals to
* post.
* 
* @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 doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {</div>
<div>this.doGet(request, response);
}
<div>/**
* Initialization of the servlet. 
* 
* @throws ServletException
* if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
<div>}
<div>
/**
* @author 
* @company leemenz (C) copyright
* @time Dec 18, 2006 3:58:53 PM
* @version 1.0.0.0
* @package com
*/
package com;</div>
import java.io.IOException;</div>
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;</div>
<div>/**
* @author Administrator
* 　这个类继承HttpServletResponseWrapper ，并重写相应的方法
*/
public class ReplaceServletWapper extends HttpServletResponseWrapper {</div>
<div>private ReplaceTextStream tpStream;</div>
<div>/**
* @param arg0
*/
public ReplaceServletWapper(HttpServletResponse arg0, String searchText,
 String replaceText) throws IOException {
// TODO Auto-generated constructor stub
super((HttpServletResponse)arg0);
tpStream = new ReplaceTextStream(arg0.getOutputStream(),searchText,replaceText);
}
<div>public ServletOutputStream getOutputStream() throws IOException {
return tpStream;
}
<div>}
<div>
/**
* @author 
* @company leemenz (C) copyright
* @time Dec 18, 2006 2:08:18 PM
* @version 1.0.0.0
* @package com
*/
package com;</div>
import java.io.IOException;</div>
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.HttpServletResponse;</div>
<div>/**
* @author Administrator
* 
* 这个类用来过滤留言或者是用户名中的非法内容
* 
*/
public class ReplaceTextFilter implements Filter {</div>
<div>private FilterConfig config;</div>
<div>private String searchStr;</div>
<div>private String replaceStr;</div>
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
config = null;
}
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
* javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response,
 FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
ReplaceServletWapper myWrappered = new ReplaceServletWapper(
 (HttpServletResponse) response, searchStr, replaceStr);
config.getServletContext().log(
 "ReplaceTextFilter : before called doFilter");
chain.doFilter(request, myWrappered);
config.getServletContext().log(
 "ReplaceTextFilter : after called doFilter");
myWrappered.getOutputStream().close();
}
<div>/*
* (non-Javadoc)
* 
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
this.config = arg0;
this.searchStr = config.getInitParameter("search");
this.replaceStr = config.getInitParameter("replace");
}
<div>}
<div>
/**
* @author 
* @company leemenz (C) copyright
* @time Dec 18, 2006 3:33:51 PM
* @version 1.0.0.0
* @package com
*/
package com;</div>
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;</div>
import javax.servlet.ServletOutputStream;</div>
<div>/**
* @author Administrator
* 这个类继承ServletOutputStream ，并重写相应的方法
*/
public class ReplaceTextStream extends ServletOutputStream {</div>
<div>private OutputStream intStream;</div>
<div>private ByteArrayOutputStream baStream;</div>
<div>private boolean closed = false;</div>
<div>private String newStr;</div>
<div>private String oldStr;</div>
<div>/**
* 
*/
public ReplaceTextStream(OutputStream outStream, String strSearch,
 String strReplace) {
// TODO Auto-generated constructor stub
intStream = outStream;
baStream = new ByteArrayOutputStream();
oldStr = strSearch;
newStr = strReplace;
}
<div>/*
* (non-Javadoc)
* 
* @see java.io.OutputStream#write(int)
*/
public void write(int b) throws IOException {
// TODO Auto-generated method stub
baStream.write(b);
}
<div>/**
* 重写方法
*/
public void println(String s) throws IOException {
s = s + "\n";
byte[] bs = s.getBytes();
baStream.write(bs);
}
<div>/**
* 重写方法
*/
public void close() throws IOException {
if (!closed) {
 processStream();
 intStream.close();
 closed = true;
}
}
<div>/**
* 重写方法
*/
public void flush() throws IOException {
if (baStream.size() != 0) {
 processStream();
 baStream = new ByteArrayOutputStream();
}
}
<div>/**
* 重写 processStream 方法
* 
* @throws IOException
*/
public void processStream() throws IOException {
intStream.write(replaceContent(baStream.toByteArray()));
}
<div>/**
* 替换所有的目的词语
* 
* @param inBytes
* @return
*/
public byte[] replaceContent(byte[] inBytes) {
String retVal = "";
String tpString = new String(inBytes);
String srchString = (new String(inBytes)).toLowerCase();
int endBody = srchString.indexOf(oldStr);
if (endBody != -1) {
 retVal = tpString.replaceAll(oldStr, newStr);
} else
 retVal = tpString;
return retVal.getBytes();
}
<div>}
<div>
<?xml version="1.0" encoding="GB2312"?>
<web-app version="2.4" 
xmlns="<a href="http://java.sun.com/xml/ns/j2ee">http://java.sun.com/xml/ns/j2ee</a>" 
xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>" 
xsi:schemaLocation="<a href="http://java.sun.com/xml/ns/j2ee">http://java.sun.com/xml/ns/j2ee</a> 
<a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd</a>"></div>
<div><!-- --></div>
<div><filter>
<filter-name>NoteFilter</filter-name>
<filter-class>com.NoteFilter</filter-class>
<init-param>
 <param-name>blackList</param-name>
 <param-value>毛泽东</param-value>
</init-param>
</filter></div>
<div><filter-mapping>
<filter-name>NoteFilter</filter-name>
<url-pattern>/servlet/NoteServlet</url-pattern>
</filter-mapping></div>
<div><filter>
<filter-name>ReplaceTextFilter</filter-name>
<filter-class>com.ReplaceTextFilter</filter-class>
<init-param>
 <param-name>search</param-name>
 <param-value>***</param-value>
</init-param>
<init-param>
 <param-name>replace</param-name>
 <param-value>**</param-value>
</init-param>
</filter></div>
<div><filter-mapping>
<filter-name>ReplaceTextFilter</filter-name>
<url-pattern>/servlet/NoteServlet</url-pattern>
</filter-mapping></div>
<div><servlet>
 <servlet-name>NoteServlet</servlet-name>
 <servlet-class>com.NoteServlet</servlet-class>
</servlet></div>
<div><servlet-mapping>
 <servlet-name>NoteServlet</servlet-name>
 <url-pattern>/servlet/NoteServlet</url-pattern>
</servlet-mapping>
</web-app></div>
<div></div>
<div>另外，要看到日志的输出信息，必须确保在server.xml文件中有如下代码：
<div class="code">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>

enjoy it!!! :)
</div>
</div>
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