Filter类代码如下：
package com.youk.wf.filter;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.youk.util.HtmlEncode;
/**
<p>Title: Btoall</p>
<p>Description: </p>
<p>Copyright: Copyright (c) 2004</p>
<p>Company: Youkone inc Ningbo.</p>
@author victor wu(woowind@sina.com)
@version 1.0
*/
public class HtmlProtectFilter
extends HttpServlet
implements Filter {
private FilterConfig filterConfig;
HtmlEncode encode = new HtmlEncode();
//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) {
try {
HttpServletResponse httpResponse = (HttpServletResponse) response;
HttpServletRequest httpRequest = (HttpServletRequest) request;
String path =httpRequest.getRequestURI();
//String mimitype = filterConfig.getServletContext().getMimeType(path);
httpRequest.setCharacterEncoding("GBK");
String ext = ".ww";
if(path.length() > 2){
path = path.substring(path.length()-3,path.length()).toLowerCase();
}
//需要乱序的资源；后2位；
if(!path.equals(ext)){
filterChain.doFilter(httpRequest, response);
}else{
System.out.println("ext="+path);
httpResponse.setContentType("text/html; charset=GBK");
ResponseWrapper wrapper = new ResponseWrapper(
httpResponse);
filterChain.doFilter(httpRequest, wrapper);
}
}
catch (Exception ex) {
ex.printStackTrace();
}
}
/**
*
*/
public void destroy(){
}
/**
*
* <p>Title: SMS</p>
* <p>Description: SMS</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: Youk Inc.</p>
* @author 吴锋彬（woowind@sina.com）
* @version 1.0
*/
public class ResponseWrapper extends HttpServletResponseWrapper {
private PrintWriter printWriter;
private ResponseOutputStream outputStream;
public ResponseWrapper(ServletResponse response) throws
java.io.IOException {
super((HttpServletResponse) response);
outputStream = new ResponseOutputStream
(response.getOutputStream());
printWriter = new PrintWriter(outputStream);
}
public ServletOutputStream getOutputStream() throws
java.io.IOException {
return outputStream;
}
public PrintWriter getWriter() throws java.io.IOException {
return printWriter;
}
}
/**
*
* @param args String[]
*/
public static void main(String[] args){
try{
String cn = "你好";
int h = cn.charAt(0);
String s = new Integer(h).toHexString(h);
//String result = java.net.URLEncoder.encode(,"GBK");
System.out.println(s);
}catch(Exception ex){
ex.printStackTrace();
}
}
public class ResponseOutputStream extends ServletOutputStream {
private OutputStream outputStream;
private ByteArrayOutputStream arrayStream;
private boolean closed = false;
public ResponseOutputStream(OutputStream stream) {
outputStream = stream;
arrayStream = new ByteArrayOutputStream();
}
public void write(int i) throws java.io.IOException {
arrayStream.write(i);
}
public void write(byte[] b)throws java.io.IOException{
arrayStream.write(b);
}
public void write(byte[] b , int a , int bb)throws java.io.IOException{
arrayStream.write(b,a,bb);
}
public void close() throws java.io.IOException {
if (!closed) {
outputStream.close();
closed = true;
}
}
public void flush() throws java.io.IOException {
if (arrayStream.size() != 0) {
if (!closed) {
processStream();
arrayStream = new ByteArrayOutputStream();
}
}
}
private void processStream() throws java.io.IOException {
System.out.println("replace.");
outputStream.write(replaceContent(arrayStream.toByteArray()));
outputStream.flush();
}
byte[] replaceContent(byte[] bytesContent) {
try{
String s = new String(bytesContent, "GBK");
if(s.toLowerCase().indexOf("<html>") != -1){
String encodeHtml = encode.encode(s);
String addS = "<script>s=\"" + encodeHtml + "\";";
String sc = "document.write(unescape(s));</script>";
return (addS+sc).getBytes();
}
}catch(Exception ex){
}
return bytesContent;
}
}
}
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