十六进制字符串与图片互相转换

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;}

}