java 16进制字符串转16进制

/**
 * @author yaodaqing == 姚大庆
 */
public class Test {

	public static void main(String[] args) {
		byte[] b = HexString2Bytes("AA020155");
		String s = Bytes2HexString(b);
		System.out.println(s);
	}
	
	/**
	* 将两个ASCII字符合成一个字节；
	* 如："EF"--> 0xEF
	* @param src0 byte
	* @param src1 byte
	* @return byte
	*/
	public static byte uniteBytes(byte src0, byte src1) {
	byte _b0 = Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
	_b0 = (byte)(_b0 << 4);
	byte _b1 = Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
	byte ret = (byte)(_b0 ^ _b1);
	return ret;
	} 

	  /**
	   * 将指定字符串src，以每两个字符分割转换为16进制形式
	   * 如："2B44EFD9" –> byte[]{0x2B, 0×44, 0xEF, 0xD9}
	   * @param src String
	   * @return byte[]
	   */
	  public static byte[] HexString2Bytes(String src){
	    byte[] ret = new byte[src.length()/2];
	    byte[] tmp = src.getBytes();
	    for(int i=0; i< tmp.length/2; i++){
	      ret[i] = uniteBytes(tmp[i*2], tmp[i*2+1]);
	    }
	    return ret;
	  }
	  
	  /**
	   * 将指定byte数组以16进制的形式打印到控制台
	   * @param hint String
	   * @param b byte[]
	   * @return void
	   */
	  public static void printHexString(String hint, byte[] b) {
	    System.out.print(hint);
	    for (int i = 0; i < b.length; i++) {
	      String hex = Integer.toHexString(b[i] & 0xFF);
	      if (hex.length() == 1) {
	        hex = '0' + hex;
	      }
	      System.out.print(hex.toUpperCase() + " ");
	    }
	    System.out.println("");
	  }
	  
	  /**
	   *
	   * @param b byte[]
	   * @return String
	   */
	  public static String Bytes2HexString(byte[] b) {
	    String ret = "";
	    for (int i = 0; i < b.length; i++) {
	      String hex = Integer.toHexString(b[i] & 0xFF);
	      if (hex.length() == 1) {
	        hex = '0' + hex;
	      }
	      ret += hex.toUpperCase();
	    }
	    return ret;
	  }

}