java压缩图片

import java.awt.Image;  
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 javax.imageio.ImageIO;  
 
import com.sun.image.codec.jpeg.JPEGCodec;  
import com.sun.image.codec.jpeg.JPEGEncodeParam;  
import com.sun.image.codec.jpeg.JPEGImageEncoder;  
 
public class ImageZipUtil {  
 
    /** 
     * 压缩图片文件 
     * 先保存原文件，再压缩、上传 
     *  
     * @param oldFile 
     *            要进行压缩的文件全路径 
     * @param width 
     *            宽度 
     * @param height 
     *            高度 
     * @param quality 
     *            质量 
     * @param smallIcon 
     *            小图片的后缀 
     * @return 返回压缩后的文件的全路径 
     */ 
    public String zipImageFile(String oldFile, int width, int height,  
            float quality, String smallIcon) {  
        if (oldFile == null) {  
            return null;  
        }  
        String newImage = null;  
        try {  
            /** 对服务器上的临时文件进行处理 */ 
            Image srcFile = ImageIO.read(new File(oldFile));
            int w = srcFile.getWidth(null);
            System.out.println(w);
           
            System.out.println(smallIcon);
            System.out.println(smallIcon);
            int h = srcFile.getHeight(null);
            System.out.println(h);
            //width = w/4;
            //height = h/4;
           
            /** 宽,高设定 */ 
            BufferedImage tag = new BufferedImage(width, height,  
                    BufferedImage.TYPE_INT_RGB);  
            tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);  
            String filePrex = oldFile.substring(0, oldFile.indexOf('.'));  
            /** 压缩后的文件名 */ 
            newImage = filePrex + smallIcon  
                    + oldFile.substring(filePrex.length());  
 
            /** 压缩之后临时存放位置 */ 
            FileOutputStream out = new FileOutputStream(newImage);  
 
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);  
            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);  
            /** 压缩质量 */ 
            jep.setQuality(quality, true);  
            encoder.encode(tag, jep);  
            out.close();  
 
        } catch (FileNotFoundException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return newImage;  
    }  
 
    /** 
     * 保存文件到服务器临时路径 
     *  
     * @param fileName 
     * @param is 
     * @return 文件全路径 
     */ 
    public String writeFile(String fileName, InputStream is) {  
        if (fileName == null || fileName.trim().length() == 0) {  
            return null;  
        }  
        try {  
            /** 首先保存到临时文件 */ 
            FileOutputStream fos = new FileOutputStream(fileName);  
            byte[] readBytes = new byte[512];// 缓冲大小  
            int readed = 0;  
            while ((readed = is.read(readBytes)) > 0) {  
                fos.write(readBytes, 0, readed);  
            }  
            fos.close();  
            is.close();  
        } catch (FileNotFoundException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return fileName;  
    }  
    public static void main(String[] args){ 
     ImageZipUtil u = new ImageZipUtil();
        u.zipImageFile("e:/SAM_0006.JPG", 128, 128, 1f, "x2");  
          
    }  
}