如何将图像保存为zip文件

问题描述

我正在尝试读取流并将读取的图像保存到zip文件中，因为这将在多天内运行并生成太多单个文件。

I am attempting to read in a stream and save the read images to a zip file as this is going to be running over multiple days and would generate far too many individual files.

我现在遇到一个问题，我似乎无法将图像保存到zip文件中。我为它构建的工作线程如下。我确信图像正在进入ImageIO.write。最后的结果是一个空的jpgs的zip文件。我想知道ImageIO是否没有将属性写入ZipOutputStream。

I now have an issue where I seem to be unable to save images into a zip file. The worker thread I have built for it is below. I am sure that the image is making it to the ImageIO.write. The result at the end however is a zip file of empty jpgs. I am wondering if perhaps ImageIO is not writing property to the ZipOutputStream.

感谢您的帮助。

public class ZipSaveWorker implements Runnable{

    public static ZipOutputStream out=null;
    BufferedImage myImage;
    private static int counter=0;



    public void run() {
        ZipEntry entry=new ZipEntry("video"+counter+".jpg");
        counter++;
        try {
            out.putNextEntry(entry);
            ImageIO.write(myImage, ".jpg", out);

        } catch (IOException ex) {
            Logger.getLogger(ZipSaveWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public ZipSaveWorker(BufferedImage image)
    {
        if (out==null)
        {
            try {
                out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(new File("images" + File.separator + "video.zip"))));
            } catch (FileNotFoundException ex) {
                Logger.getLogger(ZipSaveWorker.class.getName()).log(Level.SEVERE, null, ex);
            }
            counter=0;
        }

        myImage=image;

    }

    public static void closeStream()
    {
        try {
            out.flush();
            out.close();
        } catch (IOException ex) {
            Logger.getLogger(ZipSaveWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
    }


}

推荐答案

您的代码中的错误在以下行中：

The error in your code is in the line:

ImageIO.write(myImage, ".jpg", out);

它应该是：

ImageIO.write(myImage, "jpg", out);

我也不确定你是否应该在每个图像写完后调用closeEntry（）。

I am also not sure if you should call closeEntry() after every image has been written.

考虑一下Stephen C写的内容，如果电源被切断或VM死机，此代码可能会导致损坏的zip文件。考虑每周对zip文件进行几次备份，甚至每天几次，以确保您的多天运行不会完全毁掉（我假设可以恢复运行）。

Consider what Stephen C writes, this code could result in corrupt zip files if the power was cut or the VM died. Consider making backups of the zip files a few times a week, maybe even a few times a day, to ensure your multiple day runs aren't completely ruined (I assume a run can be resumed).

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