java字符串转byte_Java中字符串和byte数组之间的相

1、将字符转换成byte数组

String str = "罗长";

byte[] sb = str.getBytes();

2、将byte数组转换成字符

byte[] b={(byte)0xB8,(byte)0xDF,(byte)0xCB,(byte)0xD9};

String str= new String (b);

3、为了方便字符的加减操作，通常以16进制字符替代普通字符与byte数组进行相互转换

public static byte[] toByteArray(String hexString) {
        if (TextUtils.isEmpty(hexString))
            throw new IllegalArgumentException("this hexString must not be empty");

        hexString = hexString.toLowerCase();
        final byte[] byteArray = new byte[hexString.length() / 2];
        int k = 0;
        for (int i = 0; i < byteArray.length; i++) {//因为是16进制，最多只会占用4位，转换成字节需要两个16进制的字符，高位在先
            byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
            byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
            byteArray[i] = (byte) (high << 4 | low);
            k += 2;
        }
        return byteArray;
    }
    public static String toHexString(byte[] byteArray) {
        if (byteArray == null || byteArray.length < 1)
            throw new IllegalArgumentException("this byteArray must not be null or empty");

        final StringBuilder hexString = new StringBuilder();
        for (int i = 0; i < byteArray.length; i++) {
            if ((byteArray[i] & 0xff) < 0x10)//0~F前面不零
                hexString.append("0");
            hexString.append(Integer.toHexString(0xFF & byteArray[i]));
        }
        return hexString.toString().toLowerCase();
    }

第三种亲测有效