字符串转数组

 public static void main(String[] args)  {
        String str="失败是成功之母！";
        byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
    }

数组转字符串

使用String类

 public static void main(String[] args) throws UnsupportedEncodingException {

        String str="失败是成功之母！";
        byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
        String utf_8 = new String(bytes,StandardCharsets.UTF_8);
        System.out.println(utf_8);

    }

利用16进制字符串

先将字节数组转为16进制字符串，再将16进制转换成为string类型字符串

/**
 * 将byte数组转为16进制字符串
 * @param bArr byte数组
 * @return 16进制字符串
 */
public  static  String  bytesToHexString(byte[] bArr){
    StringBuffer sb = new StringBuffer(bArr.length);
    String sTmp;

    for (int i = 0; i < bArr.length; i++) {
        sTmp = Integer.toHexString(0xFF & bArr[i]);
        if (sTmp.length() < 2) {
            sb.append(0);
        }
        sb.append(sTmp.toUpperCase());
    }
    return sb.toString();

}

	/**
     * 将16进制字符串转为String类型字符串
     * @param hexStr
     * @return
     */
    public static String hexStringToString(String hexStr) {
        String str = "0123456789ABCDEF";
        char[] hexs = hexStr.toCharArray();
        byte[] bytes = new byte[hexStr.length() / 2];
        int n;
        for (int i = 0; i < bytes.length; i++) {
            n = str.indexOf(hexs[2 * i]) * 16;
            n += str.indexOf(hexs[2 * i + 1]);
            bytes[i] = (byte) (n & 0xff);
        }
        return new String(bytes);
    }