apache fileupload后台处理方式

package com.servlet;

importjava.io.IOException;

importjava.io.PrintWriter;

importjava.util.HashMap;

importjava.util.Iterator;

importjava.util.List;

import java.util.Map;

import javax.servlet.ServletConfig;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

importorg.apache.commons.fileupload.servlet.ServletFileUpload;

import org.jivesoftware.openfire.plugin.db.DbManager;

/******************************************************************  

**文件名:Up.java

**Copyright(c)2007-2011dhdu@qq.com

**创建人:dhdu@qq.com

**日期:2011-05-04

**修改人:

**日期:

**描述:uploadServlet

**jsppage<formaction="u"method="post"enctype="multipart/form-data">

**版本:

**

**==============================================================

**

**修改记录

**

**版本号修改编号修改者修改日期修改说明

**===========================================

**0001

**0002

**

********************************************************************/

publicclassUpextendsHttpServlet{

 private static final long serialVersionUID = 1L;

 public void init(ServletConfig config) throws ServletException {

super.init(config);

 }

 public void destroy() {

super.destroy();

 }

 private void up(HttpServletRequest request, HttpServletResponse response)

throwsServletException,IOException{

response.setContentType("text/html;charset=UTF-8");

PrintWriterout=response.getWriter();

Stringp="",filename=null;

Mapmap=newHashMap();

byte[]bytes=null;

  try {

   // 文件大小限制10M

intmaxPostSize=10*1024*1024;

//文件工厂类

DiskFileItemFactoryfactory=newDiskFileItemFactory();

//factory.setSizeThreshold(4096);

ServletFileUploadupload=newServletFileUpload(factory);

//upload.setHeaderEncoding("UTF-8");

//upload.setSizeMax(maxPostSize);

ListfileItems=upload.parseRequest(request);

if(fileItems!=null&&fileItems.size()>0){

Iteratoriter=fileItems.iterator();

while(iter.hasNext()){

FileItemitem=(FileItem)iter.next();

if(item.isFormField()){

if(!"submit".equals(item.getFieldName())){

p=item.getString("UTF-8");

       System.out.println(item.getFieldName() + " :" + p);

       map.put(item.getFieldName(), p);

}

     } else {

      bytes = item.get();

if(bytes.length>0){

filename=item.getName();

System.out.println(filename);

//item.write(newFile("d:/"+filename));

}

}

}

}

if(bytes!=null&&bytes.length>0)

    DbManager.getInstance().saveFile(bytes, filename, map);

   out.write("ok!!!" + p);

  } catch (Exception e) {

e.printStackTrace();

out.write("Exception!!!");

  } finally {

  }

 }

 protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throwsServletException,IOException{

doPost(req,resp);

 }

 protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throwsServletException,IOException{

req.setCharacterEncoding("UTF-8");

up(req,resp);

 }

 /*

  * ------这个是后台用jsp实现

  *

*<%DiskFileItemFactoryfactory=newDiskFileItemFactory();

*ServletFileUploadupload=newServletFileUpload(factory);try{List

*items=upload.parseRequest(request);Iteratoritr=items.iterator();

*while(itr.hasNext()){FileItemitem=(FileItem)itr.next();if

*(item.isFormField()){System.out.println("表单参数名:"+item.getFieldName()

*+"，表单参数值:"+item.getString("UTF-8"));}else

*{System.out.println("上传文件的大小:"+item.getSize());

*System.out.println("上传文件的类型:"+item.getContentType());

*System.out.println("上传文件的名称:"+item.getName());FiletempFile=new

*File(item.getName());Filefile=newFile(request.getRealPath("/")+

*"photofiles",tempFile.getName());item.write(file);Stringfname=

*item.getName();%><scriptlanguage="javascript">alert("上传成功！");

*</script><%}}}catch(Exceptione){e.printStackTrace();%><script

*language="javascript">alert("上传失败，请重新上传！");</script><%}

  */

}