Java中上传图片压缩处理的方法示例

java;">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.*; /**  * 图片压缩处理  * @author 崔素强  */ 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("开始：" + new Date().toLocaleString());     ImgCompress imgCom = new ImgCompress("C://temp//pic123.jpg");     imgCom.resizeFix(400, 400);     System.out.println("结束：" + new Date().toLocaleString());   }   /**    * 构造函数    */   public ImgCompress(String fileName) throws IOException {     File file = new File(fileName);// 读入文件     img = ImageIO.read(file);   // 构造Image对象     width = img.getWidth(null);  // 得到源图宽     height = img.getHeight(null); // 得到源图长   }   /**    * 按照宽度还是高度进行压缩    * @param w int 最大宽度    * @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);     }   }   /**    * 以宽度为基准，等比例放缩图片    * @param w int 新宽度    */   public void resizeByWidth(int w) throws IOException {     int h = (int) (height * w / width);     resize(w, h);   }   /**    * 以高度为基准，等比例缩放图片    * @param h int 新高度    */   public void resizeByHeight(int h) throws IOException {     int w = (int) (width * h / height);     resize(w, h);   }   /**    * 强制压缩/放大图片到固定的大小    * @param w int 新宽度    * @param h int 新高度    */   public void resize(int w, int h) throws IOException {     // SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢     BufferedImage image = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB );      image.getGraphics().drawImage(img, 0, 0, w, h, null); // 绘制缩小后的图     File destFile = new File("C://temp//456.jpg");     FileOutputStream out = new FileOutputStream(destFile); // 输出到文件流     // 可以正常实现bmp、png、gif转jpg     JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);     encoder.encode(image); // JPEG编码     out.close();   } } 

开始：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)