java.lang.OutOfMemoryError：将 13k .png 图像拼接在一起时的 Java 堆空间

我有 13255 张图像，每张图像宽度为 240 x 240 像素，最大大小为 15,412 字节，最小大小为 839 字节。

我试图循环遍历文件夹，将它们添加到 File[] 中。一旦我有了每个图像的数组，我就将它们放入 BufferedImage[] 中，准备好循环并绘制到由每个单独的图像组成的更大的单个图像上。

每个图像的命名形式为

图像 x-y.png

但是，我总是遇到 java.lang.OutOfMemoryError: Java heap space 错误。我不知道为什么。我尝试通过将参数添加到 Eclipse 目标的末尾来更改 JVM 可用的内存大小。以下是我用过的：

IDE's\eclipse-jee-juno-SR2-win32-x86_64\eclipse\eclipse.exe -vmargs -Xms64m -Xmx1024m

and

IDE's\eclipse-jee-juno-SR2-win32-x86_64\eclipse\eclipse.exe -vmargs -Xms64m -Xmx4096m

两者都没有效果。我还进入控制面板 -> 程序 -> Java 并更改了那里的可用内存量。

这是我写的方法：

public static void merge_images() throws IOException {
        int rows = 115; 
        int cols = 115;
        int chunks = rows * cols;

        System.out.println(chunks);

        int chunkWidth, chunkHeight;
        int type;
        // fetching image files
        File[] imgFiles = new File[chunks];

        int count = 0;
        for (int j = 1; j <= 115; j++) {
            for (int k = 1; k <= 115; k++) {
                imgFiles[count] = new File("G:\\Images\\Image " + j
                        + "-" + k + ".png");
                count++;
            }
        }
        System.out.println(imgFiles.length);

        // creating a buffered image array from image files
        BufferedImage[] buffImages = new BufferedImage[chunks];
        for (int i = 0; i < chunks; i++) {
            buffImages[i] = ImageIO.read(imgFiles[i]);
            System.out.println(i);
        }
        type = buffImages[0].getType();
        chunkWidth = buffImages[0].getWidth();
        chunkHeight = buffImages[0].getHeight();

        // Initializing the final image
        BufferedImage finalImg = new BufferedImage(chunkWidth * cols,
                chunkHeight * rows, type);

        int num = 0;
        for (int i = 0; i < rows; i++) {
            for (int k = 0; k < cols; k++) {
                finalImg.createGraphics().drawImage(buffImages[num], null,
                        chunkWidth * k, chunkHeight * i);
                num++;
            }
        }
        System.out.println("Image concatenated.....");
        ImageIO.write(finalImg, "png", new File("fusions.png"));
        System.out.println("Image Saved, Exiting");
    }

在此处的打印行

for (int i = 0; i < chunks; i++) {
            buffImages[i] = ImageIO.read(imgFiles[i]);
            System.out.println(i);
}

始终止步于7320点附近。

这是确切的控制台打印输出

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.awt.image.DataBufferByte.<init>(Unknown Source)
    at java.awt.image.ComponentSampleModel.createDataBuffer(Unknown Source)
    at java.awt.image.Raster.createWritableRaster(Unknown Source)
    at javax.imageio.ImageTypeSpecifier.createBufferedImage(Unknown Source)
    at javax.imageio.ImageReader.getDestination(Unknown Source)
    at com.sun.imageio.plugins.png.PNGImageReader.readImage(Unknown Source)
    at com.sun.imageio.plugins.png.PNGImageReader.read(Unknown Source)
    at javax.imageio.ImageIO.read(Unknown Source)
    at javax.imageio.ImageIO.read(Unknown Source)
    at main.merge_images(main.java:48)
    at main.main(main.java:19)

任何我出错的想法将不胜感激。

Regards,

Jamie

您不需要将所有块图像保存在内存中。您可以一张一张地阅读它们，并在最终循环中绘制最终图像，如下所示：

for (int i = 0; i < rows; i++) {
    for (int k = 0; k < cols; k++) {
        BufferedImage buffImage = ImageIO.read(imgFiles[num]);
        finalImg.createGraphics().drawImage(buffImage, null,
                chunkWidth * k, chunkHeight * i);
        num++;
    }
}

这将节省至少一半的内存。