package test; 
import java.io.*; 
import java.util.Date; 
import java.awt.*; 
import java.awt.image.*; 
import javax.imageio.ImageIO; 
import com.sun.image.codec.jpeg.*; 
/** 
 * 圖片壓縮處理 
 * @author 崔素強(qiáng) 
 */ 
public class ImgCompress { 
  private Image img; 
  private int width; 
  private int height; 
  @SuppressWarnings("deprecation") 
  public static void main(String[] args) throws Exception { 
    System.out.println("開始：" + new Date().toLocaleString()); 
    ImgCompress imgCom = new ImgCompress("C:\\temp\\pic123.jpg"); 
    imgCom.resizeFix(400, 400); 
    System.out.println("結(jié)束：" + new Date().toLocaleString()); 
  } 
  /** 
   * 構(gòu)造函數(shù) 
   */ 
  public ImgCompress(String fileName) throws IOException { 
    File file = new File(fileName);// 讀入文件 
    img = ImageIO.read(file);   // 構(gòu)造Image對(duì)象 
    width = img.getWidth(null);  // 得到源圖寬 
    height = img.getHeight(null); // 得到源圖長 
  } 
  /** 
   * 按照寬度還是高度進(jìn)行壓縮 
   * @param w int 最大寬度 
   * @param h int 最大高度 
   */ 
  public void resizeFix(int w, int h) throws IOException { 
    if (width / height > w / h) { 
      resizeByWidth(w); 
    } else { 
      resizeByHeight(h); 
    } 
  } 
  /** 
   * 以寬度為基準(zhǔn)，等比例放縮圖片 
   * @param w int 新寬度 
   */ 
  public void resizeByWidth(int w) throws IOException { 
    int h = (int) (height * w / width); 
    resize(w, h); 
  } 
  /** 
   * 以高度為基準(zhǔn)，等比例縮放圖片 
   * @param h int 新高度 
   */ 
  public void resizeByHeight(int h) throws IOException { 
    int w = (int) (width * h / height); 
    resize(w, h); 
  } 
  /** 
   * 強(qiáng)制壓縮/放大圖片到固定的大小 
   * @param w int 新寬度 
   * @param h int 新高度 
   */ 
  public void resize(int w, int h) throws IOException { 
    // SCALE_SMOOTH 的縮略算法 生成縮略圖片的平滑度的 優(yōu)先級(jí)比速度高 生成的圖片質(zhì)量比較好 但速度慢 
    BufferedImage image = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB );  
    image.getGraphics().drawImage(img, 0, 0, w, h, null); // 繪制縮小后的圖 
    File destFile = new File("C:\\temp\\456.jpg"); 
    FileOutputStream out = new FileOutputStream(destFile); // 輸出到文件流 
    // 可以正常實(shí)現(xiàn)bmp、png、gif轉(zhuǎn)jpg 
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); 
    encoder.encode(image); // JPEG編碼 
    out.close(); 
  } 
} 

開始：2014-4-14 16:25:11 
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space 
  at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:58) 
  at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:397) 
  at java.awt.image.Raster.createWritableRaster(Raster.java:938) 
  at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1169) 
  at javax.imageio.ImageReader.getDestination(ImageReader.java:2879) 
  at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:943) 
  at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:915) 
  at javax.imageio.ImageIO.read(ImageIO.java:1422) 
  at javax.imageio.ImageIO.read(ImageIO.java:1282) 
  at test.ImgCompress.<init>(ImgCompress.java:31) 
  at test.ImgCompress.main(ImgCompress.java:21)