HexString을 자바로 변환하는 방법?

Question

안녕하세요 저는 16 진수 문자열을 가지고 있습니다. 그걸 jpg 이미지로 변환해야합니다. 어떻게하는지 설명해주세요.이 16 진수 문자열은 jpg 이미지로 변환해야하는데, 여기에서 시도하고 있지만 오지는 않습니다.

String hex="ff d8 ff e0 00 11 4a 46 49 46 00 01 01 01 00 00 00 00 00 00 0a ff db 00 43 00 08 06 06 07 06 05 08 07 07 07 09 09 08 0a 0c 14 0d 0c 0b 0b 0c 19 12 13 0f 14 1d 1a 1f 1e 1d 1a 1c 1c 20 24 2e 27 20 22 2c 23 1c 1c 28 37 29 2c 30 31 34 34 34 1f 27 39 3d 38 32 3c 2e 33 34 32 ff db 00 43 01 09 09 09 0c 0b 0c 18 0d 0d 18 32 21 1c 21 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 ff c4 00 1f 00 00 01 05 01 01 01 01 01 01 00 00 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 10 00 02 01 03 03 02 04 03 05 05 04 04 00 00 01 7d 01 02 03 00 04 11 05 12 21 31 41 06 13 51 61 07 22 71 14 32 81 91 a1 08 23 42 b1 c1 15 52 d1 f0 24 33 62 72 82 09 0a 16 17 18 19 1a 25 26 27 28 29 2a 34 35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65 66 67 68 69 6a 73 74 75 76 77 78 79 7a 83 84 85 86 87 88 89 8a 92 93 94 95 96 97 98 99 9a a2 a3 a4 a5 a6 a7 a8 a9 aa b2 b3 b4 b5 b6 b7 b8 b9 ba c2 c3 c4 c5 c6 c7 c8 c9 ca d2 d3 d4 d5 d6 d7 d8 d9 da e1 e2 e3 e4 e5 e6 e7 e8 e9 ea f1 f2 f3 f4 f5 f6 f7 f8 f9 fa ff c4 00 1f 01 00 03 01 01 01 01 01 01 01 01 01 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 11 00 02 01 02 04 04 03 04 07 05 04 04 00 01 02 77 00 01 02 03 11 04 05 21 31 06 12 41 51 07 61 71 13 22 32 81 08 14 42 91 a1 b1 c1 09 23 33 52 f0 15 62 72 d1 0a 16 24 34 e1 25 f1 17 18 19 1a 26 27 28 29 2a35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65"; 
//   String sb = "0d 02 01 02 4e 52 30 39 47 30 35 36 31 38 00 03 00 fa 01 95 e4 53 c0 a8 51 b1 53 a3 03 40 89 54 66 9c ee 10 01 de 9a 5c 22 e6 a0 2c 5d b2 69 8c 9d 79 e6 a5 41 50 c6 78 ab 31 8c 8a 00 72 83 53 2a e0 67 14 d0 2a 54 1b 85 00 00 76 a6 b4 64 1e 95 32 a1 c8 a5 90 f3 81 da 98 15 88 c7 51 54 6e 63 cb 1e 3a d6 99 19 19 ef 55 6e 13 2b 91 49 89 98 2f a7 49 b8 95 20 8a 88 d9 cc b9 f9 0d 6d 85 e6 9e 23 e3 a5 06 7c a6 02 c6 e8 c3 2a 72 0d 74 90 1d d1 29 f5 14 cf 29 5b 82 01 fa 8a 9d 14 00 00 e0 50 38 ad 46 4c 38 15 89 7a b8 9c fa 11 5b f2 2e 56 a9 5c e9 ad 39 0e 18 03 8e f4 8a 68 c4 14 d2 39 ad 07 d2 ae 17 a0 0d f4 35 5d ed 27 4f bd 1b 0f c2 99 9d 88 06 41 ae 9f 4e 19 b2 88 fb 57 36 54 83 c8 23 eb c5 74 da 70 c5 94 7f 4a 07 1d cb 2c 3e 53 58 77 1c ca 45 6e 37 dd 35 89 38 fd e9 a1 97 2d 88 76 d1 8a 76 29 c8 bb 98 52 32 23 da 4f 6a 96 38 01 19 6e 95 21 c0 e0 0a 98 0d d1 0c 75 14 0a c4 b6 d1 a0 8f 81 8c d3 9d 76 1a 92 24 21 00 a8 e7 38 fc 29 9b c7 62 85 c9 dc f8 f4 aa f8 a7 bb 65 89 a6 1e b4 8c a5 ab 0a 43 41 a6 f7 a0 43 5e 95 54 e0 50 06 48 06 a4 c7 14 0e 28 85 86 2a 32 78 a9 5e a0 90 e0 52 35 7b 12 e2 81 4b 8e 69 71 4c 60 bd 6a 74 a8 50 73 53 31 c0 da 3a d0 00 cd b8 e0 74 14 a0 8c e3 bd 20 18 1c 75 a6 a9 cb 8d c3 9c d3 02 c4 7c 1a b8 83 8a aa 8a 59 b8 ab 89 c0 02 80 1e 38 a5 52 41 e2 90 0a 51 40 0f f3 1b 34 ed e1 ba f5 a8 a9 71 40 12 16 e3 02 a2 75 ca 9a 78 a5 c1 34 01 45 46 3a d4 8b 43 ae d9 0f bd 0b 40 89 00 14 f0 05 31 4d 48 a2 81 8e db 9a 70 5a 45 19 a9 00 a6 16 1a 12 83 1e 6a 40 29 c1 68 15 91 58 db 46 df 79 14 fe 15 24 71 88 d7 6a 8c 01 da a6 c5 21 5a 01 22 0d 0a 2a 4b 57 00 0f 00 01 82 03 00 00 0d 0a "; 
//   String raw_DeviceId = sb.substring(38, 1040); 
      byte[] b = HexStringToByteArray(hex); 
//   imageInFile.read(b); 
      for (int i = 0; i < b.length; i++) { 
       byte c = b[i]; 
       System.out.println("c = " + c); 

      } 
      /* 
      * Converting Image byte array into Base64 String 
      */ 
      String imageDataString = encodeImage(b); 
      /* 
      * Converting a Base64 String into Image byte array 
      */ 
      byte[] imageByteArray = decodeImage(imageDataString); 
      /* 
      * Write a image byte array into file system 
      */ 
      FileOutputStream imageOutFile = new FileOutputStream("D:/img6.jpg"); 
      imageOutFile.write(imageByteArray); 

      imageInFile.close(); 
      imageOutFile.close(); 

      System.out.println("Image Successfully Manipulated!"); 
     } catch (FileNotFoundException e) { 
      System.out.println("Image not found" + e); 
     } catch (IOException ioe) { 
      System.out.println("Exception while reading the Image " + ioe); 
     } 

    } 

    /** 
    * Encodes the byte array into base64 string 
    * 
    * @param imageByteArray - byte array 
    * @return String a {@link java.lang.String} 
    */ 
    public static String encodeImage(byte[] imageByteArray) { 
     return Base64.encodeBase64URLSafeString(imageByteArray); 
    } 

    /** 
    * Decodes the base64 string into byte array 
    * 
    * @param imageDataString - a {@link java.lang.String} 
    * @return byte array 
    */ 
    public static byte[] decodeImage(String imageDataString) { 
     return Base64.decodeBase64(imageDataString); 
    } 

} 

그리고 HexString

는 convertion을 BYTEARRAY합니다 :

public static byte[] HexStringToByteArray(String hexStr) { 
     int len = hexStr.length(); 
     byte[] data = new byte[len/2]; 
     for (int i = 0; i < len; i += 2) { 
      data[i/2] = (byte) ((Character.digit(hexStr.charAt(i), 16) << 4) 
        + Character.digit(hexStr.charAt(i + 1), 16)); 
     } 
     return data; 
    } 

업데이트 :

String hex = "ff d8 ff e0 00 11 4a 46 49 46 00 01 01 01 00 00 00 00 00 00 0a ff db 00 43 00 08 06 06 07 06 05 08 07 07 07 09 09 08 0a 0c 14 0d 0c 0b 0b 0c 19 12 13 0f 14 1d 1a 1f 1e 1d 1a 1c 1c 20 24 2e 27 20 22 2c 23 1c 1c 28 37 29 2c 30 31 34 34 34 1f 27 39 3d 38 32 3c 2e 33 34 32 ff db 00 43 01 09 09 09 0c 0b 0c 18 0d 0d 18 32 21 1c 21 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 ff c4 00 1f 00 00 01 05 01 01 01 01 01 01 00 00 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 10 00 02 01 03 03 02 04 03 05 05 04 04 00 00 01 7d 01 02 03 00 04 11 05 12 21 31 41 06 13 51 61 07 22 71 14 32 81 91 a1 08 23 42 b1 c1 15 52 d1 f0 24 33 62 72 82 09 0a 16 17 18 19 1a 25 26 27 28 29 2a 34 35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65 66 67 68 69 6a 73 74 75 76 77 78 79 7a 83 84 85 86 87 88 89 8a 92 93 94 95 96 97 98 99 9a a2 a3 a4 a5 a6 a7 a8 a9 aa b2 b3 b4 b5 b6 b7 b8 b9 ba c2 c3 c4 c5 c6 c7 c8 c9 ca d2 d3 d4 d5 d6 d7 d8 d9 da e1 e2 e3 e4 e5 e6 e7 e8 e9 ea f1 f2 f3 f4 f5 f6 f7 f8 f9 fa ff c4 00 1f 01 00 03 01 01 01 01 01 01 01 01 01 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 11 00 02 01 02 04 04 03 04 07 05 04 04 00 01 02 77 00 01 02 03 11 04 05 21 31 06 12 41 51 07 61 71 13 22 32 81 08 14 42 91 a1 b1 c1 09 23 33 52 f0 15 62 72 d1 0a 16 24 34 e1 25 f1 17 18 19 1a 26 27 28 29 2a35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65"; 
//   String sb = "0d 02 01 02 4e 52 30 39 47 30 35 36 31 38 00 03 00 fa 01 95 e4 53 c0 a8 51 b1 53 a3 03 40 89 54 66 9c ee 10 01 de 9a 5c 22 e6 a0 2c 5d b2 69 8c 9d 79 e6 a5 41 50 c6 78 ab 31 8c 8a 00 72 83 53 2a e0 67 14 d0 2a 54 1b 85 00 00 76 a6 b4 64 1e 95 32 a1 c8 a5 90 f3 81 da 98 15 88 c7 51 54 6e 63 cb 1e 3a d6 99 19 19 ef 55 6e 13 2b 91 49 89 98 2f a7 49 b8 95 20 8a 88 d9 cc b9 f9 0d 6d 85 e6 9e 23 e3 a5 06 7c a6 02 c6 e8 c3 2a 72 0d 74 90 1d d1 29 f5 14 cf 29 5b 82 01 fa 8a 9d 14 00 00 e0 50 38 ad 46 4c 38 15 89 7a b8 9c fa 11 5b f2 2e 56 a9 5c e9 ad 39 0e 18 03 8e f4 8a 68 c4 14 d2 39 ad 07 d2 ae 17 a0 0d f4 35 5d ed 27 4f bd 1b 0f c2 99 9d 88 06 41 ae 9f 4e 19 b2 88 fb 57 36 54 83 c8 23 eb c5 74 da 70 c5 94 7f 4a 07 1d cb 2c 3e 53 58 77 1c ca 45 6e 37 dd 35 89 38 fd e9 a1 97 2d 88 76 d1 8a 76 29 c8 bb 98 52 32 23 da 4f 6a 96 38 01 19 6e 95 21 c0 e0 0a 98 0d d1 0c 75 14 0a c4 b6 d1 a0 8f 81 8c d3 9d 76 1a 92 24 21 00 a8 e7 38 fc 29 9b c7 62 85 c9 dc f8 f4 aa f8 a7 bb 65 89 a6 1e b4 8c a5 ab 0a 43 41 a6 f7 a0 43 5e 95 54 e0 50 06 48 06 a4 c7 14 0e 28 85 86 2a 32 78 a9 5e a0 90 e0 52 35 7b 12 e2 81 4b 8e 69 71 4c 60 bd 6a 74 a8 50 73 53 31 c0 da 3a d0 00 cd b8 e0 74 14 a0 8c e3 bd 20 18 1c 75 a6 a9 cb 8d c3 9c d3 02 c4 7c 1a b8 83 8a aa 8a 59 b8 ab 89 c0 02 80 1e 38 a5 52 41 e2 90 0a 51 40 0f f3 1b 34 ed e1 ba f5 a8 a9 71 40 12 16 e3 02 a2 75 ca 9a 78 a5 c1 34 01 45 46 3a d4 8b 43 ae d9 0f bd 0b 40 89 00 14 f0 05 31 4d 48 a2 81 8e db 9a 70 5a 45 19 a9 00 a6 16 1a 12 83 1e 6a 40 29 c1 68 15 91 58 db 46 df 79 14 fe 15 24 71 88 d7 6a 8c 01 da a6 c5 21 5a 01 22 0d 0a 2a 4b 57 00 0f 00 01 82 03 00 00 0d 0a "; 
//   String raw_DeviceId = sb.substring(38, 1040); 
//   byte[] b = HexStringToByteArray(hex); 
////   imageInFile.read(b); 
//   for (int i = 0; i < b.length; i++) { 
//    byte c = b[i]; 
//    System.out.println("c = " + c); 
// 
//   } 

      Font font = new Font("Arial", Font.PLAIN, 12); 
      BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB); 
      Graphics2D g2d = img.createGraphics(); 
      FontMetrics fm = g2d.getFontMetrics(font); 
      g2d.dispose(); 

      int width = fm.stringWidth(hex); 
      int height = fm.getHeight(); 
      img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
      g2d = img.createGraphics(); 
      g2d.setColor(Color.WHITE); 
      g2d.fillRect(0, 0, width, height); 
      g2d.setColor(Color.BLACK); 
      g2d.setFont(font); 
      g2d.drawString(hex, 0, fm.getAscent()); 
      g2d.dispose(); 

      try { 
       ImageIO.write(img, "jpg", new File("Hex.jpg")); 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 

Answer 1

당신은 닭과 달걀 문제의 종류를 가지고있다. 이미지를 생성하려면 이미지를 만드는 데 필요한 크기를 알아야합니다. 이 정보를 계산하기 위해서는

다음 예제 간단한 참조를 획득하기 위해 사용되는 1x1BufferedImage를 생성 ... 주어진 Graphics 컨텍스트의 FontMetrics을 확인하기 위하여, 그 화상으로부터 Graphics 컨텍스트를 필요 해당 String의 필요한 너비/높이를 계산하는 데 사용되는 FontMetrics입니다.

그러면 올바른 크기의 BufferedImage이라는 새 인스턴스를 만들고 String이 렌더링됩니다. 잘 모르겠어요

그것은 다음 jpg 파일에 저장됩니다 ... 출력 이미지의

작은 조각 ...

String hex="ff d8 ff e0 00 11 4a 46 49 46 00 01 01 01 00 00 00 00 00 00 0a ff db 00 43 00 08 06 06 07 06 05 08 07 07 07 09 09 08 0a 0c 14 0d 0c 0b 0b 0c 19 12 13 0f 14 1d 1a 1f 1e 1d 1a 1c 1c 20 24 2e 27 20 22 2c 23 1c 1c 28 37 29 2c 30 31 34 34 34 1f 27 39 3d 38 32 3c 2e 33 34 32 ff db 00 43 01 09 09 09 0c 0b 0c 18 0d 0d 18 32 21 1c 21 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 ff c4 00 1f 00 00 01 05 01 01 01 01 01 01 00 00 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 10 00 02 01 03 03 02 04 03 05 05 04 04 00 00 01 7d 01 02 03 00 04 11 05 12 21 31 41 06 13 51 61 07 22 71 14 32 81 91 a1 08 23 42 b1 c1 15 52 d1 f0 24 33 62 72 82 09 0a 16 17 18 19 1a 25 26 27 28 29 2a 34 35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65 66 67 68 69 6a 73 74 75 76 77 78 79 7a 83 84 85 86 87 88 89 8a 92 93 94 95 96 97 98 99 9a a2 a3 a4 a5 a6 a7 a8 a9 aa b2 b3 b4 b5 b6 b7 b8 b9 ba c2 c3 c4 c5 c6 c7 c8 c9 ca d2 d3 d4 d5 d6 d7 d8 d9 da e1 e2 e3 e4 e5 e6 e7 e8 e9 ea f1 f2 f3 f4 f5 f6 f7 f8 f9 fa ff c4 00 1f 01 00 03 01 01 01 01 01 01 01 01 01 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09 0a 0b ff c4 00 b5 11 00 02 01 02 04 04 03 04 07 05 04 04 00 01 02 77 00 01 02 03 11 04 05 21 31 06 12 41 51 07 61 71 13 22 32 81 08 14 42 91 a1 b1 c1 09 23 33 52 f0 15 62 72 d1 0a 16 24 34 e1 25 f1 17 18 19 1a 26 27 28 29 2a35 36 37 38 39 3a 43 44 45 46 47 48 49 4a 53 54 55 56 57 58 59 5a 63 64 65"; 

Font font = new Font("Arial", Font.PLAIN, 12); 
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB); 
Graphics2D g2d = img.createGraphics(); 
FontMetrics fm = g2d.getFontMetrics(font); 
g2d.dispose(); 

int width = fm.stringWidth(hex); 
int height = fm.getHeight(); 
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
g2d = img.createGraphics(); 
g2d.setColor(Color.WHITE); 
g2d.fillRect(0, 0, width, height); 
g2d.setColor(Color.BLACK); 
g2d.setFont(font); 
g2d.drawString(hex, 0, fm.getAscent()); 
g2d.dispose(); 

try { 
    ImageIO.write(img, "jpg", new File("Hex.jpg")); 
} catch (IOException ex) { 
    ex.printStackTrace(); 
}