java servlet upload

hezhou_0521

package com.hzsy.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Upload extends HttpServlet {

private static final  String CONTENT_TYPE="text/html,charset=UTF-8";
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType(CONTENT_TYPE);

DiskFileItemFactory factory=new DiskFileItemFactory();

String path=request.getRealPath("/upload");

factory.setRepository(new File(path));

factory.setSizeThreshold(1024*1024);

ServletFileUpload su=new ServletFileUpload(factory);

try {
List<FileItem> list=su.parseRequest(request);

for(FileItem item:list){

if(item.isFormField()){

String fileName=item.getFieldName();

String value=item.getString("UTF-8");

request.setAttribute(fileName, value);

}else{

String fileName=item.getFieldName();

String name=item.getName();

int start=name.lastIndexOf("\\");

String value=name.substring(start+1);

request.setAttribute(fileName, value);

OutputStream os=new FileOutputStream(new File(path,value));

InputStream is=item.getInputStream();

byte[] bt=new byte[500];

int length=0;

while((length=is.read(bt))>0){
os.write(bt, 0, length);
}
is.close();
os.close();
}
}

request.getRequestDispatcher("index_o.jsp").forward(request, response);
} catch (FileUploadException e) {

e.printStackTrace();
}

System.out.println("hello mr he!!");
}

}