java字节数组和16进制之间的转换

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*/
package test.util;
 
/**
*
* @author Administrator
*/
public class StringUtil {
 
    public StringUtil() {
    }
 
    /**
     * 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 String printHexString( byte[] b) {
        StringBuffer returnValue = new StringBuffer();
        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() + " ");
            returnValue.append(hex.toUpperCase() + " ");
        }
 
        return "[" + returnValue.toString() + "]";
    }
 
    /**
     *
     * @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;
    }
 
    /**
     * 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, 0x44, 0xEF, 0xD9}
     * @param src String
     * @return byte[]
     */
    public static byte[] HexString2Bytes(String src) {
        byte[] ret = new byte[8];
        byte[] tmp = src.getBytes();
        for (int i = 0; i < 8; i++) {
            ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
        }
        return ret;
    }
}