java应用程序中写的一个图片压缩的demo在web应用程序中压缩的图片大小为0，应用程序中是正常的

Question

public void saveImageAsFormat(File fromFile,int targetW,String imgType,String toSaveFile) throws IOException{

    BufferedImage srcImage = null,tgtImage=null;

    srcImage = ImageIO.read(fromFile);
    int type = srcImage.getType();
    int targetH=0;
    double sx = (double) targetW / srcImage.getWidth();
    targetH = (int) (sx * srcImage.getHeight());//获得压缩图片的高度

    if (type == BufferedImage.TYPE_CUSTOM) {
         ColorModel cm = srcImage.getColorModel();
         WritableRaster raster = cm.createCompatibleWritableRaster(targetW,targetH);
         boolean alphaPremultiplied = cm.isAlphaPremultiplied();
         tgtImage = new BufferedImage(cm, raster, alphaPremultiplied, null);
    } else {
        tgtImage = new BufferedImage(targetW, targetH, type);
    }
    Graphics2D g = tgtImage.createGraphics();
    g.setRenderingHint(RenderingHints.KEY_RENDERING,
    RenderingHints.VALUE_RENDER_QUALITY);
    g.drawRenderedImage(srcImage, AffineTransform.getScaleInstance(sx, sx));
    g.dispose();

    File saveFile = new File(toSaveFile);

    ImageIO.write(tgtImage, imgType, saveFile);

}

Answer 1

[quote]图片保存到目标路径了，但大小是0，测试了下压缩时间，也是花时间了的，所以和纠结。[/quote]
那你看看在web程序和普通应用程序执行的时候差别在哪里？