java byte转16进制

 //将指定byte数组以16进制的形式打印到控制台
public static void printHexString( byte[] b) {
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() );
}

}