java - 图像和堆大小问题

Question

我正在尝试使用 Asprise 裁剪应用程序裁剪 1000 张图像。

流程是，首先从 Content Manager 下载图像，然后裁剪图像，然后再次将裁剪后的图像上传到 Content Manager 中。

我已经创建了批处理文件来运行 1000 张图像， 最初它适用于 300 张图像并给出以下错误

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at java.awt.image.DataBufferInt.<init>(Unknown Source)
        at java.awt.image.Raster.createPackedRaster(Unknown Source)
        at java.awt.image.DirectColorModel.createCompatibleWritableRaster(
n Source)
        at java.awt.image.BufferedImage.<init>(Unknown Source)
        at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown Source)
        at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown Source)
        at sun.java2d.loops.MaskBlit$General.MaskBlit(Unknown Source)
        at sun.java2d.loops.Blit$GeneralMaskBlit.Blit(Unknown Source)
        at sun.java2d.pipe.DrawImage.blitSurfaceData(Unknown Source)
        at sun.java2d.pipe.DrawImage.renderImageCopy(Unknown Source)
        at sun.java2d.pipe.DrawImage.copyImage(Unknown Source)
        at sun.java2d.pipe.DrawImage.copyImage(Unknown Source)
        at sun.java2d.SunGraphics2D.drawImage(Unknown Source)
        at sun.awt.image.ImageRepresentation.drawToBufImage(Unknown Source
        at sun.java2d.pipe.DrawImage.copyImage(Unknown Source)
        at sun.java2d.pipe.ValidatePipe.copyImage(Unknown Source)
        at sun.java2d.SunGraphics2D.drawImage(Unknown Source)
        at sun.java2d.SunGraphics2D.drawImage(Unknown Source)

然后我将堆大小增加到 -Xmx728M，可处理 500 多个图像，但再次出现相同的内存不足错误。

它在标记行上抛出错误

  private BufferedImage toBufferedImage(Image image) {
         if (image instanceof BufferedImage) {
             return (BufferedImage)image;
         }

         image = new ImageIcon(image).getImage();

             boolean hasAlpha = hasAlpha(image);

         BufferedImage bimage = null;
         GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
         try {
             int transparency = Transparency.OPAQUE;
             if (hasAlpha) {
                 transparency = Transparency.BITMASK;
             }

             GraphicsDevice gs = ge.getDefaultScreenDevice();
             GraphicsConfiguration gc = gs.getDefaultConfiguration();
             bimage = gc.createCompatibleImage(
                 image.getWidth(null), image.getHeight(null), transparency);
         } catch (HeadlessException e) {
             // The system does not have a screen
             e.printStackTrace();
         }

         if (bimage == null) {
             // Create a buffered image using the default color model
             int type = BufferedImage.TYPE_INT_RGB;
             if (hasAlpha) {
                 type = BufferedImage.TYPE_INT_ARGB;
             }
             bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
         }


         Graphics g = bimage.createGraphics();

         g.drawImage(image, 0, 0, null);      //error
         g.dispose();

      return bimage;
     }

我可以做什么来解决这个问题？ 如何释放BufferedImage内存？

我用过

BufferedImageObj.flush();
BufferedImageObj=null;

但是这不起作用。

Answer 1

我怀疑您的错误实际上并不是该行的结果；相反，我怀疑绘制图像会将程序插入 OutOfMemory 状态。

您通常无法同时在内存中保存那么多图像。请记住，Java 默认情况下以全分辨率加载图像。我认为它不容易容纳数百张图像。确保您只在特定时刻加载您需要的内容。然后，当不再需要该图像时，通过将图像设置为 null，让 JVM 垃圾回收内存。