InstantiationException 有原码谢谢111

[xtuyaowu]

erro:
java.lang.InstantiationException: YouBean.UpBean
org.apache.jsp.upjsp_jsp._jspService(upjsp_jsp.java:47)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


code:

package YouBean;
import java.io.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import javax.servlet.ServletInputStream;



public class UpBean {



public void doUpload(HttpServletRequest request) throws IOException
{

try{
PrintWriter pw = new PrintWriter(

new BufferedWriter(new FileWriter("test.txt")));

ServletInputStream in = request.getInputStream();



int i = in.read();

while (i != -1) {

pw.print((char) i);

i = in.read();

}

pw.close();

}
catch(Exception e){}

}}

能 帮我 改改 吗？？