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import javax.servlet.*;   
import javax.servlet.http.HttpServletResponse;   
import java.io.IOException;   
  
/**
* ÓÃÓÚµÄʹ Browser ²»»º´æÒ³ÃæµÄ¹ýÂËÆ÷
*/  
public class ForceNoCacheFilter implements Filter {   
  
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException   
{   
    ((HttpServletResponse) response).setHeader("Cache-Control","no-cache");   
    ((HttpServletResponse) response).setHeader("Pragma","no-cache");   
    ((HttpServletResponse) response).setDateHeader ("Expires", -1);   
    filterChain.doFilter(request, response);   
}   
  
public void destroy()   
{   
}   
  
     public void init(FilterConfig filterConfig) throws ServletException   
{   
}   
}   
  
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import javax.servlet.*;   
import javax.servlet.http.HttpServletRequest;   
import javax.servlet.http.HttpServletResponse;   
import javax.servlet.http.HttpSession;   
import java.util.List;   
import java.util.ArrayList;   
import java.util.StringTokenizer;   
import java.io.IOException;   
  
/**
* ÓÃÓÚ¼ì²âÓû§ÊÇ·ñµÇ½µÄ¹ýÂËÆ÷£¬Èç¹ûδµÇ¼£¬ÔòÖØ¶¨Ïòµ½Ö¸µÄµÇÂ¼Ò³Ãæ
* ÅäÖòÎÊý
* checkSessionKey Ðè¼ì²éµÄÔÚ Session Öб£´æµÄ¹Ø¼ü×Ö
* redirectURL Èç¹ûÓû§Î´µÇ¼£¬ÔòÖØ¶¨Ïòµ½Ö¸¶¨µÄÒ³Ãæ£


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import java.io.*;
import java.math.*;
import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        Scanner cin=new Scanner(System.in);
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import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
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//import java.io.*;
File filereadonly=new File(%%1);
try {
boolean b=filereadonly.setReadOnly();
}
catch (Exception e) {
System.out.println("¾Ü¾øÐ´·ÃÎÊ£º"+e.printStackTrace());

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