十六进制字符串与图片互相转换

偏执的太偏执、 2022-06-07 01:11 466阅读 0赞

import java.awt.image.BufferedImage;
    import java.io.ByteArrayOutputStream;
    import java.io.File;
    import java.io.IOException;
    import java.math.BigInteger;
    
    import javax.imageio.ImageIO;
    import javax.imageio.stream.FileImageOutputStream;
    
    public class ImgUtil { 
    
        public static void main(String[] args) { 
            String hexString = imageToHex("f:/1.jpg","jpg");//将图片转换成十六进制字符串
            hexToImage("f://2.jpg",hexString);              //将十六进制字符串转化成图片
        } 
    
        /** * 将图片转换成十六进制字符串 */ 
        static String imageToHex(String filePath,String suffix) { 
            File f = new File(filePath,suffix); 
            BufferedImage bi; 
            try { 
                bi = ImageIO.read(f); 
                ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
                ImageIO.write(bi, suffix, baos); 
                byte[] bytes = baos.toByteArray(); 
                return new BigInteger(1, bytes).toString(16); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
            return null; 
        } 
    
        /** * 将十六进制字符串转化成图片 */ 
        static void hexToImage(String filePath,String hexString) { 
            byte[] bytes = stringToByte(hexString);
            try{
                FileImageOutputStream imageOutput = new FileImageOutputStream(new File(filePath));
                imageOutput.write(bytes, 0, bytes.length);
                imageOutput.close();
            } catch(Exception ex) {
                ex.printStackTrace();
            } 
        }
    
        public static byte[] stringToByte(String s) {
          int length = s.length() / 2;
          byte[] bytes = new byte[length];
          for (int i = 0; i < length; i++) {
              bytes[i] = (byte) ((Character.digit(s.charAt(i * 2), 16) << 4) | Character.digit(s.charAt((i * 2) + 1), 16));
          }
          return bytes;
        }
    }