commons-fileupload上传图片获取图片长宽?

用commons-fileupload上传图片时怎样获取图片的长宽,如300*200这种类型.怎样做?
若用js怎么实现获取图片的长宽?
请哪位仁兄快快帮我解答一下.

[code="java"]
/*

• Created on 2005-1-14 */ package org.common.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
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 javax.imageio.ImageIO;

import org.apache.log4j.Logger;
import org.apache.struts.upload.FormFile;

/**

• @author 张欣
  */
  public class UploadFile {
  //获得日志服务
  static Logger logger = Logger.getLogger( UploadFile.class.getName (); ); ;

  public static String upLoad(FormFile file,String uploadDir,String newName,int bigersize); throws FileNotFoundException, IOException{

  String data = null;
  String location = null;
  String totalname;
  String extend;
  StringBuffer fileName;
  String contentType;
  
  int size;        
  int i;
  int width;
  int height;
  File dirPath;
  InputStream inputStream = null;
  OutputStream outputStream;
  
  //得到上传文件的全名,包括扩展名
  totalname = file.getFileName();;             
   //得到扩展名
  i = totalname.lastIndexOf(".");;
  
   //如果没有上传图片，则返回空
   if(i==-1);{
      return location;
   }
  
   extend = totalname.substring(i);;
   //得到文件大小
   size = file.getFileSize();;
  
   logger.info("#上传图片扩展名为:# =" + extend);;
   logger.info("#上传图片大小为:# =" + size/1024 + "K");;
  
   if(!extend.equalsIgnoreCase(".jpg");&&!extend.equalsIgnoreCase(".gif");&&!extend.equalsIgnoreCase(".jpeg");&&!extend.equalsIgnoreCase(".bmp");&&
          !extend.equalsIgnoreCase(".png");&&!extend.equalsIgnoreCase(".doc");&&!extend.equalsIgnoreCase(".txt");&&!extend.equalsIgnoreCase(".rar");&&!extend.equalsIgnoreCase(".zip");&&!extend.equalsIgnoreCase(".pdf"););{
      return "filetypeWrong";
   }
  
   if(size>1024*bigersize);{
      return "filesizeWrong";
   }
  
   //重命名该文件
   fileName = new StringBuffer(newName + extend);;
   fileName.toString();;     
  
   //判断宽高
  inputStream = file.getInputStream();;  
  
  BufferedImage bi = ImageIO.read(inputStream);; 
  // another interface such as:read(new File(filename););; 
  System.out.println("Width=" + bi.getWidth(););; 
  System.out.println("Height=" + bi.getHeight(););; 
  width = bi.getWidth();;
  height = bi.getHeight();;
  if(width>1500 || height>1500);{
      return "filetoohigh";
  }
  
  //在图片上写入网站标示的文字
  //利用Graphics2D的新特性.
  Graphics2D g2D = bi.createGraphics();; 
  //定义字体(楷体或宋体等); 及其大小
  Font myfont=new Font("\u5b8b\u4f53",Font.PLAIN,20);;
  g2D.setFont(myfont);;
  //字体颜色为黑
  g2D.setColor(Color.BLACK);;
  
  //需要写在图片上文字 注意:中文需要操作系统支持中文 如中文window,
  //linux下要安装中文字库,并使jdk1.4支持这个中文
  String strs="hello everyone 中 文";
  
  //在离顶部 和左边各为20处 写入文字,该处使用了对中文处理的getBytes功能.
  g2D.drawString(new String(strs.getBytes("ISO8859_1"););,20,20);;
  
  //必须使用,表示完成 
  g2D.dispose();; 
  
  try {
  //使用ImageIO写入图片 
  ImageIO.write(bi, ext, ThF);;
  
  //原来是使用com.sun.image.codec.jpeg.*的功能,如下.需要下载com.sun.image.codec.jpeg
  //FileOutputStream out = new FileOutputStream(ThF);;
  //JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);;
  //encoder.encode(Bi);;
  //out.close();;
  
  }catch (Exception ex); {
  throw new Exception(" ImageIo.write error in CreatThum.: "+ex.getMessage(););; 
  }
  
  //上传
  dirPath = new File(uploadDir);;
  if (!dirPath.exists();); {
      dirPath.mkdirs();;
  }        
  outputStream = new FileOutputStream(uploadDir + fileName);;
  int bytesRead = 0;
  byte[] buffer = new byte[8192];
  while ((bytesRead = inputStream.read(buffer, 0, 8192);); != -1); {
      outputStream.write(buffer, 0, bytesRead);;
  }
  
  location = dirPath.getAbsolutePath();
      + System.getProperty("file.separator"); + fileName;
  
  outputStream.close();;
  inputStream.close();;
  file.destroy();;
  
  return location;
  

  }
  }

[/code]

js代码

var image=document.getElementById("imge");

alert(image.width+":"+image.height);