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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    
{    
}    
}    
   
¶þ¡¢¼ì²âÓû§ÊÇ·ñµÇ½µÄ¹ýÂËÆ÷    
   
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;    
 


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Toolkit tk = Toolkit.getDefaultToolkit();
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public class HelloWorldApp { //an application
public static void main (String args[ ]){
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