文件上传类

package com.xiao.company.filter;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts.actions.DispatchAction;
import org.apache.struts.upload.FormFile;

/*
* 此类是专为文件上传用
*/

public class Upload extends DispatchAction
{
public String upload(FormFile file,String servletContext)
{
// String servletContext=servlet.getServletContext().getRealPath("/"); //获取项目在系统(服务器)中的路径(包含项目名在内),即项目的根目录
// System.out.println("当然2项目路径为: "+servletContext);
Date da=new Date();
long m=da.getTime();

String fileName=file.getFileName();

String fileType=fileName.substring(fileName.lastIndexOf("."));
fileName=m+fileType;
int filesize = (int) (file.getFileSize());
InputStream streamIn=null;
OutputStream streamOut=null;

String ownerfile="/images/photo";
String vlocation=ownerfile+"/"+fileName;
String plocation=servletContext+vlocation;
File rootDir=new File(servletContext+ownerfile);
try {

int by=0;
byte [] bu=new byte[filesize];
if(!rootDir.isDirectory())
rootDir.mkdirs();
streamIn=file.getInputStream();
streamOut=new FileOutputStream(plocation);
while((by=streamIn.read(bu,0,filesize))!=-1)
{
streamOut.write(bu,0,by);
}
streamOut.close();
streamIn.close();
return fileName;
} catch (FileNotFoundException e)
{
// TODO 自动生成 catch 块
e.printStackTrace();
} catch (IOException e)
{
// TODO 自动生成 catch 块
e.printStackTrace();
}

return null;
}
}