閱讀使用Java從單個文件中獲取元數據

Question

我想從單個文件讀取圖像元數據。 我嘗試下面的代碼：

http://johnbokma.com/java/obtaining-image-metadata.html

當我運行它，我得到build successful但沒有任何反應。

public class Metadata { 

    public static void main(String[] args) { 
     Metadata meta = new Metadata(); 
     int length = args.length; 
     for (int i = 0; i < length; i++) 
     meta.readAndDisplayMetadata(args[i]); 
    } 

    void readAndDisplayMetadata(String fileName) { 
     try { 

      File file = new File(fileName); 
      ImageInputStream iis = ImageIO.createImageInputStream(file); 
      Iterator<ImageReader> readers = ImageIO.getImageReaders(iis); 

      if (readers.hasNext()) { 

       // pick the first available ImageReader 
       ImageReader reader = readers.next(); 

       // attach source to the reader 
       reader.setInput(iis, true); 

       // read metadata of first image 
       IIOMetadata metadata = reader.getImageMetadata(0); 

       String[] names = metadata.getMetadataFormatNames(); 
       int length = names.length; 
       for (int i = 0; i < length; i++) { 
        System.out.println("Format name: " + names[ i ]); 
        displayMetadata(metadata.getAsTree(names[i])); 
       } 
      } 
     } 
     catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

} 

請幫助:)

Answer 1

您沒有正確指定文件路徑。下面的變化應該表明這一點！

public static void main(String[] args) { 
    Metadata meta = new Metadata(); 
    int length = args.length; 
    for (int i = 0; i < length; i++) { 
     if (new File(args[i]).exists()) { 
      meta.readAndDisplayMetadata(args[i]); 
     } else { 
      System.out.println("cannot find file: " + args[i]); 
     } 
    } 
} 

編輯 -

我們現在靜態確定要使用的文件更簡單的代碼示例。

public static void main(String[] args) { 
    Metadata meta = new Metadata(); 
    String filename = "C:\\Users\\luckheart\\Pictures\\Sample Pictures\\Koala.jpg"; 
    if (new File(filename).exists()) { 
     meta.readAndDisplayMetadata(filename); 
    } else { 
     System.out.println("cannot find file: " + filename); 
    } 
}