急手的文件上传问题~~~~~~~~!

以下代码,不知道哪地方错了,请给予帮助.
// FrontEnd Plus GUI for JAD
// DeCompiled : servletUpload.class
package blue;import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;
import java.io.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.*;public class uploadimages extends HttpServlet
{    private ServletConfig config;    public uploadimages()
    {
    }    public void destroy()
    {
    }    public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
        throws ServletException, IOException
    {
        PrintWriter printwriter = httpservletresponse.getWriter();
        httpservletresponse.setContentType("text/html;charset=gb2312"); printwriter.println("<HTML>");
        printwriter.println("<BODY BGCOLOR='white'>");
        printwriter.println("<H1>jspSmartUpload : Servlet Sample</H1>");
        printwriter.println("<HR><BR>");
        printwriter.println("The method of the HTML form must be POST.");
        printwriter.println("</BODY>");
        printwriter.println("</HTML>");
    }    protected void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
        throws ServletException, IOException
    {
        PrintWriter printwriter = httpservletresponse.getWriter();
         httpservletresponse.setContentType("text/html;charset=gb2312");
         String imagesavename=new String();
boolean flag = false;
SmartUpload smartupload = new SmartUpload();
        try
        {
            smartupload.initialize(config, httpservletrequest, httpservletresponse);
            smartupload.upload();
java.util.Enumeration e = smartupload.getRequest().getParameterNames();
while (e.hasMoreElements()) {
    String key = (String)e.nextElement();
String[] values = smartupload.getRequest().getParameterValues(key);
for(int i = 0; i < values.length; i++) {
if (key.equalsIgnoreCase("uname")) imagesavename=values[i];
}
} for (int i=0;i<smartupload.getFiles().getCount();i++){
        com.jspsmart.upload.File myFile = smartupload.getFiles().getFile(i);
    myFile.saveAs(imagesavename);
if (!smartupload.getFiles().getFile(i).isMissing())
{
String str_htm="<html>"+(char)(13)+(char)(10)+
"<head>"+(char)(13)+(char)(10)+
"<title>操作成功</title>"+(char)(13)+(char)(10)+
"</head>"+(char)(13)+(char)(10)+
"<body bgcolor=\"#C0C0C0\">"+(char)(13)+(char)(10)+
"<SCRIPT language=JavaScript>"+(char)(13)+(char)(10)+
"self.close();"+(char)(13)+(char)(10)+
"</SCRIPT>"+(char)(13)+(char)(10)+
"</body>"+(char)(13)+(char)(10)+
"</html>";
printwriter.println(str_htm);
//writeOutput(str_htm,"c:\\inetpub\\wwwroot\\online\\img.htm");*/
}
}
// int i = smartupload.save("/");
 //           printwriter.println(i + " file uploaded.");
        }
        catch(Exception exception)
        {
            printwriter.println("Unable to upload the file.<br>");
            printwriter.println("Error : " + exception.toString());
        }
        printwriter.println("</BODY>");
        printwriter.println("</HTML>");
    }    public final ServletConfig getServletConfig()
    {
        return config;
    }    public final void init(ServletConfig servletconfig)
        throws ServletException
    {
        config = servletconfig;
    }
    //流方式写文件
 static void writeOutput(String str, String strOutFile) { 
try { 
FileOutputStream fos = new FileOutputStream(strOutFile); 
Writer out = new OutputStreamWriter(fos, "GB2312"); 
out.write(str); 
out.close(); 
} 
catch (IOException e) { 
e.printStackTrace(); 
e.printStackTrace(); 
} 
} 
//流方式读文件
 static String readInput(String strInFile)//String AppendStr 
{
StringBuffer buffer = new StringBuffer(); 
    try { 
FileInputStream fis = new FileInputStream(strInFile); 
 InputStreamReader isr = new InputStreamReader(fis, "GB2312"); 
Reader in = new BufferedReader(isr); 
int ch; 
int iCharNum;
 iCharNum=0;
while ((ch = in.read())>-1) { 
iCharNum += 1; 
buffer.append((char)ch); 
} 
//buffer.append(AppendStr);
in.close(); 
return buffer.toString(); 
} 
catch (IOException e) { 
e.printStackTrace(); 
return null; 
} 
}}