从java输入流打开图像文件

Question

我想打开一个图像文件，打包在一个.jar文件中，使用我运行程序的计算机的默认图像查看器。

我发现了很多关于如何访问使用InputStream打包在一个jar中的文件的答案，但是如何使用该InputStream打开这些文件？

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

我可以将此转换为Image，ImageIcon或BufferedImage但如何我进一步打开默认的图像浏览器的形象呢？

我的类名是“测试”，我试图访问的图像是C:\Users\Pranav\Documents\NetBeansProjects\Test\src\test\DSC_6283.jpg

任何帮助，将不胜感激。

Answer 1

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 

注意，这是样板。我偷了这个版本从Easy way to write contents of a Java InputStream to an OutputStream

Answer 2

1. 保存在本地的图像（例如C：\ my_image.jpg），这是不是在.jar文件
2. 使用Runtime.getRuntime().exec("cmd your_command_here_to_open_image"); 这里是Windows上的链接cmd命令：http://www.sevenforums.com/software/180378-where-windows-photo-viewer-default-location.html