從java輸入流打開圖像文件

Question

我想打開一個圖像文件，打包在一個.jar文件中，使用我運行程序的計算機的默認圖像查看器。

我發現了很多關於如何訪問使用InputStream打包在一個jar中的文件的答案，但是如何使用該InputStream打開這些文件？

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

我可以將此轉換爲Image，ImageIcon或BufferedImage但如何我進一步打開默認的圖像瀏覽器的形象呢？

我的類名是「測試」，我試圖訪問的圖像是C:\Users\Pranav\Documents\NetBeansProjects\Test\src\test\DSC_6283.jpg

任何幫助，將不勝感激。

Answer 1

純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()); 
} 

---

編輯：

 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，這是樣板。我偷了這個版本從Easy way to write contents of a Java InputStream to an OutputStream

Answer 2

1. 保存在本地的圖像（例如C：\ my_image.jpg），這是不是在.jar文件
2. 使用Runtime.getRuntime().exec("cmd your_command_here_to_open_image"); 這裏是Windows上的鏈接cmd命令：http://www.sevenforums.com/software/180378-where-windows-photo-viewer-default-location.html