从java InputStream打开图像文件 [英] Opening an image file from java InputStream

问题描述

我正在尝试使用我运行程序的计算机的默认图像查看器打开一个打包在.jar文件中的图像文件。

I am trying to open an image file that is packaged in a .jar file using the default image viewer of the computer on which i run my program.

I已经找到了很多关于如何使用InputStream访问打包在jar中的文件的答案，但我如何使用该InputStream打开这些文件？

I have found numerous answers about how to access files that are packaged in a jar using InputStream but how can i open those files using that InputStream?

InputStream imageStream = Test.class.getClass().getResourceAsStream("/test/DSC_6283.jpg");

我可以将其转换为图像， ImageIcon 或 BufferedImage 但如何在默认图像查看器中进一步打开图像？

I can convert this into an Image, ImageIcon or a BufferedImage but how to i further open the image in the default image viewer?

我的班级名称是测试，我尝试访问的图片是 C：\ Users \ Pranav \ Files \ NetBeansProjects \ Test \ src\test\DSC_6283.jpg

My class name is 'Test' and the image i am trying to access is C:\Users\Pranav\Documents\NetBeansProjects\Test\src\test\DSC_6283.jpg

任何帮助都将不胜感激。

Any help would be appreciated.

推荐答案

纯java：

public static void main(String... args) throws IOException {
    InputStream imageStream = Test.class.getClass().getResourceAsStream("/test/DSC_6283.jpg");
    Path path = Files.createTempFile("DSC_6283", ".jpg");
    try (FileOutputStream out = new FileOutputStream(path.toFile())) {
        byte[] buffer = new byte[1024]; 
        int len; 
        while ((len = imageStream.read(buffer)) != -1) { 
            out.write(buffer, 0, len); 
        }
    } catch (Exception e) {
        // TODO: handle exception
    }
    Desktop.getDesktop().open(path.toFile());
}

---

编辑：

---

        byte[] buffer = new byte[1024]; //allocate an array of bytes to use as a buffer. 1024 bytes in this case
        int len; //a variable to record the number of bytes actually read from the stream each loop
        while ((len = imageStream.read(buffer)) != -1) { //InputStream.read(byte[]) reads bytes from the stream and places them into the buffer. It returns the number of bytes placed into the buffer, or -1 if there is nothing more to read. We store that result in len, and evaluate if we should stop looping (ie if the return is -1)
            out.write(buffer, 0, len); //write to the output file, from the buffer, starting at position 0, through the number of bytes read

<请注意，这是样板文件。我从轻松获取此版本将Java InputStream的内容写入OutputStream

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