图片处理程序

/*
 * @author: [email protected]
 * @date  : 2010-6-17  Create file,Base Function
 * @date  : 2010-7-14  [email protected], optimize resize funtion 
 *
 * 说明: 
 *  1. 只有resizeImage返回true，才是合法图片，才保存, 返回false的是非法图片，请应用处理自行删除
 *  2. imagemaick 需要 升级到 6.6.3，
 *  3. jmagick 5.5.6 版本不变, 要重新build, link到新的imagemagick上
 *  更新记录：
 *  1. 解决gif动画效果丢失的问题
 *  
 *  存在的问题：
 *  1. png图片压缩后大小会变大
*/


import magick.ImageInfo;
import magick.MagickImage;
import magick.MagickException;
import java.io.File;


public class ImgUploadUtil
{

    //定义允许上传的最大文件大小
    public static final long MAX_FILE_SIZE = (1024 * 1024 * 5); //5Mbyte
    //定义允许上传的图片最大像素，这个会影响到系统稳定，建议不要太大
    public static final int  MAX_IMAGE_PIXEL = (10 * 1000 * 1000);
  
    private static boolean resizeImage(String fileName) throws MagickException
    {
        MagickImage image  = null;
        boolean ret = false;

        //检查文件大小，避免文件太大导致ImageMagick内存分配不足
        if(!checkFileFize(fileName))
        {
            return ret;
        }
        try
        {
        	ImageInfo info = new ImageInfo(fileName);
            image = new MagickImage();
            image.pingImage(info);
            
            String mimeType=image.getImageFormat();
            int width   = (int) image.getDimension().getWidth();
            int height  = (int) image.getDimension().getHeight();
            System.out.println(mimeType);
                   //检查图片的像素数
            if(width * height > MAX_IMAGE_PIXEL)
            {
                return ret;
            }
            //读入图片
            image.readImage(info);
            //等比例缩小
        	if(width > 0 && height > 0 )
            {
        		if(mimeType.equalsIgnoreCase("gif")){
        			MagickImage[] images=image.breakFrames();
        			for(int i=0;i<images.length;i++){  
                       images[i]= images[i].zoomImage(width,height);  
                   }  
        			image =new MagickImage(images);
        		}
        		else{
        			image = image.zoomImage(width, height);
        		}            
                image.profileImage("*", null); //clean unuse info
                image.setImageAttribute("comment", null); //clean unuse info
                image.setFileName(fileName);
                image.writeImage(info);    
                ret = true;
            }      
		}
    	catch (Exception e){
			//e.printStackTrace();
		}
        finally
        {
            if (image != null)
            {
                image.destroyImages();
            }
        }
        return ret;
    }
    //检查文件大小
    public static boolean checkFileFize(String file)
    {
        File f = new File(file);
        if(f.exists() && f.length() < MAX_FILE_SIZE)
        {
            return true;
        }
        return false;
    }
    //Demo main function
    public static void main(String[] args) throws MagickException
    {

        //boolean[] bRet={false};
        String[] fileName = {
        		"D:\\test\\img\\g2.GIF",  //gif 
        		"D:\\test\\img\\g3.gif",  //gif 
        		"D:\\test\\img\\g4.gif",  //gif 
        		"D:\\test\\img\\g5.gif",  //gif 
        		"D:\\test\\img\\g6.gif",  //gif 
        		"D:\\test\\img\\p2.png",  //png
        		"D:\\test\\img\\p3.png",  //png
        		"D:\\test\\img\\p4.png",  //png
        		"D:\\test\\img\\p5.png",  //png
        		"D:\\test\\img\\p6.png",  //png
        		"D:\\test\\img\\j2.jpg",  //jpg finshing pic!!!
        		"D:\\test\\img\\j4.jpg",  //jpg finshing pic!!!
        		"D:\\test\\img\\j5.jpg",  //jpg finshing pic!!!
        		"D:\\test\\img\\j6.jpg",   //jpg finshing pic!!!
        		"D:\\test\\img\\bad-1.jpg", //dirty jpg
        		"D:\\test\\img\\bad-2.jpg", //dirty jpg
        		"D:\\test\\img\\bad-3.jpg", //dirty jpg
        		"D:\\test\\img\\bad-4.jpg", //dirty jpg
        		};
        boolean[] bRet=new boolean[fileName.length];
        for(int i=0;i<fileName.length;i++){
        	bRet[i]=false;
        	File f1 = new File(fileName[i]);
        	System.out.println("["+i+"]"+"正在压缩文件："+fileName[i]);
        	System.out.println("压缩前的大小："+f1.length());
            bRet[i]=resizeImage(fileName[i]);
          	File f2 = new File(fileName[i]);
          	System.out.println("压缩后的大小："+f2.length());
            if(bRet[i])
            {
                System.out.println("Save File:" + fileName[i]);
            }
            else
            {
                System.out.println("Delete dirty file:"+ fileName[i]);
            }
        }
   
    }

}