JAVA 中 String 到 byte[] 和 byte[] 到 String 的相互转换

Question

我一直在尝试使用 "DESede" 加密来编码和解码一些数据。编码没问题，但我在解码时遇到了问题。我得到了格式如“[B@7764dc81”（只是一个示例值）的编码数据，它应该是 byte[] 格式，但我得到的是字符串形式的数据（这是一个要求），现在，我想将“[B@7764dc81”（只是一个示例值）从字符串转换为 byte[] 形式，但不幸的是，它对我来说不起作用。

函数String.getBytes(); return 一次又一次的不同结果，其中调用此方法的 String 对象是相同的。但是通过方法(Arrays.toString(String.getBytes()))return得到的Array值都是一样的，这让我很困惑。

基本上，我想根据机器的主板序列号和 MAC 地址对一些值进行编码，连接两个密钥，并生成一个新密钥。之后，我想解码获得的密钥，将其拆分回来，并检查密钥是否与 MAC 地址和主板序列号的原始值完全匹配。我在后面的过程中遇到问题。我得到两个“[B@f56dec29”（只是一个示例值）格式的切片字符串值，我希望它们采用 byte[] 格式，以便我可以将它们传递到我的 ObjectCrypter.decryptF() 函数中.此外，此函数会引发语句 "key length must be a multiple of 8..." 的异常。 main 函数在可视化日期方面有很大帮助，正确的人可能第一眼就猜到实际发生了什么。我有两个文件，代码如下： Security.java

public class Security {

public static void main(String[] args) throws NoSuchAlgorithmException,UnknownHostException, SocketException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, UnsupportedEncodingException
{
    String algorithm = "DESede";
    ObjectCrypter obj = null;
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey();
    Cipher c = Cipher.getInstance(algorithm);
    String serial = getSerialNumber();
    String mac = getMacAddress();


    serial = getSerialNumber();
    mac = getMacAddress();
    byte[] encryptionBytes1 = obj.encryptF(serial,symKey,c);
    System.out.println("Serial: " + serial);
    System.out.println("Encr: " + encryptionBytes1);
    System.out.println("Decr: " + obj.decryptF(encryptionBytes1, symKey, c));
    byte[] encryptionBytes2 = obj.encryptF(mac,symKey,c);
    System.out.println("MAC: " + mac);
    System.out.println("Encr: " + encryptionBytes2);
    System.out.println("Decr: " + obj.decryptF(encryptionBytes2, symKey, c));


    System.out.println("EncryptionBytes: "+encryptionBytes1);
    System.out.println("Array EncBytes: "+Arrays.toString(encryptionBytes1));
    String ts = encryptionBytes1.toString();
    System.out.println("TesString: "+ts);
    System.out.println("TesString ConvBytes: "+ts.getBytes("ISO-8859-1"));
    System.out.println("TesString ConvBytes2: "+ts.getBytes("ISO-8859-1"));
    System.out.println("ts array: "+Arrays.toString(ts.getBytes("ISO-8859-1")));
    byte[] tsec = ts.getBytes("ISO-8859-1");
    System.out.println("tsec array: "+Arrays.toString(tsec));
    System.out.println("esTrEncrypt: "+tsec);
    System.out.println("esTrEncryptBytes1: "+tsec.toString().getBytes("ISO-8859-1"));
    System.out.println("esTRarray1: "+Arrays.toString(tsec));
    System.out.println("esTrEncryptBytes2: "+tsec.toString().getBytes("ISO-8859-1"));
    System.out.println("esTRarray1: "+Arrays.toString(tsec));
    System.out.println("esTrEncryptBytes3: "+tsec.toString().getBytes("ISO-8859-1"));
    System.out.println("esTRarray1: "+Arrays.toString(tsec));
    String decoded = new String(encryptionBytes1, "ISO-8859-1");
    System.out.println("Decoded: "+decoded);
    byte[] encoded = decoded.getBytes("ISO-8859-1");
    System.out.println("Encoded: "+encoded);
    System.out.println("ArrayEncoded: "+Arrays.toString(encoded));
    String decrypted = obj.decryptF(encoded, symKey, c);
    System.out.println("decrypted: "+decrypted);

    serial = getSerialNumber();
    mac = getMacAddress();
    byte[] encryptionBytes12 = obj.encryptF(serial,symKey,c);
    System.out.println("Serial: " + serial);
    System.out.println("Encr: " + encryptionBytes12);
    System.out.println("Decr: " + obj.decryptF(encryptionBytes1, symKey, c));
    byte[] encryptionBytes22 = obj.encryptF(mac,symKey,c);
    System.out.println("MAC: " + mac);
    System.out.println("Encr: " + encryptionBytes22);
    System.out.println("Decr: " + obj.decryptF(encryptionBytes2, symKey, c));
}//end test
public static String generateData() throws NoSuchAlgorithmException, NoSuchPaddingException, UnknownHostException, SocketException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException
{
    String part1 = null, part2 = null;
    String algorithm = "DESede";
    ObjectCrypter obj = null;
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey();
    Cipher c = Cipher.getInstance(algorithm);
    String serial = getSerialNumber();
    String mac = getMacAddress();
    byte[] encryptionBytes = obj.encryptF(serial, symKey, c);
    part1 = encryptionBytes.toString();
    byte[] encryptionBytes2 = obj.encryptF(mac, symKey, c);
    part2 = encryptionBytes2.toString();
    part1 = sliceString(part1);
    part2 = sliceString(part2);
    return part1+part2;
}//end generateData


public static boolean checkLicense(String license) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnknownHostException, SocketException, UnsupportedEncodingException
{
    String part1 = null, part2 = null;
    String genSerial = null, genMac = null;
    if (license.length() == 16)
    {
        part1 = "[B@" + license.substring(0, 8);
        part2 = "[B@" + license.substring(8, license.length());
    }//end if
    else if (license.length() == 15)
    {
        part1 = "[B@" + license.substring(0, 7);
        part2 = "[B@" + license.substring(7, license.length());
    }//end if
    else
    {
        return false;
    }//end else


    byte[] bpart1 = part1.getBytes("ISO-8859-1");
    byte[] bpart2 = part2.getBytes("ISO-8859-1");

    System.out.println("bytes: "+bpart1 + "\t" + bpart2);

    System.out.println("parts: "+part1 + "\t" + part2);
    String algorithm = "DESede";
    ObjectCrypter obj = null;
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey();
    Cipher c = Cipher.getInstance(algorithm);
    genSerial = sliceString(obj.decryptF(bpart1, symKey, c));
    genMac = sliceString(obj.decryptF(bpart2, symKey, c));
    System.out.println(genSerial + "\t" + genMac);
    System.out.println(getSerialNumber() + "\t" + getMacAddress());
    if (genSerial == getSerialNumber() && genMac == getMacAddress())
    {
        return true;
    }//end if
    else
    {
        return false;
    }//end else
}//end checkLicense
public static String sliceString(String arg)
{
    return arg.substring(3);
}//end sliceString

public static String getSerialNumber()
{
    String output = "";
    try 
    { 
        Process p=Runtime.getRuntime().exec("wmic baseboard get serialnumber"); 
        //p.waitFor(); 
        BufferedReader reader=new BufferedReader(new InputStreamReader(p.getInputStream())); 
        String line = "";
        int index = 0;
        while((line = reader.readLine()) != null)
        {
            if (line.length() > 0)
            {
                output = line;
            }//end if
        }//end while
    } 
    catch(IOException e1) {}
    return output;
}//end extractMBSerialNumber

public static String getMacAddress() throws UnknownHostException, SocketException
{
    InetAddress ip;
    ip = InetAddress.getLocalHost();

    NetworkInterface network = NetworkInterface.getByInetAddress(ip);
    byte[] mac = network.getHardwareAddress();

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < mac.length; i++) {
        sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));        
    }
    return sb.toString();
}

}

ObjectCrypter.java 的代码是：

public class ObjectCrypter {
static String algorithm = "DESede";

static byte[] encryptF(String input,Key pkey,Cipher c) throws InvalidKeyException, BadPaddingException,

IllegalBlockSizeException {

    c.init(Cipher.ENCRYPT_MODE, pkey);

    byte[] inputBytes = input.getBytes();

    return c.doFinal(inputBytes);
}

static String decryptF(byte[] encryptionBytes,Key pkey,Cipher c) throws InvalidKeyException,

BadPaddingException, IllegalBlockSizeException {

    c.init(Cipher.DECRYPT_MODE, pkey);

    byte[] decrypt = c.doFinal(encryptionBytes);

    String decrypted = new String(decrypt);
    return decrypted;
}

}

Answer 1

您的 [B@7764dc81 只是 toString () 在 byte [] 上的结果。如果您想创建一个基于字节的字符串，您需要使用String bytes = new String (yourbytearray);

或更好

new String (yourbytes, Charset.forName ("utf-8"));

您不应该按字面意思使用这些字符串。

"[B@" 只是数组的缩写 [ 地址 @ 处的字节数 B 加上地址...

同样从字符串到字节[]的转换是：

  byte [] bytedata = yourstring.getBytes (Charset.forName ("utf-8"));

Answer 2

当您在 byte[] 上呼叫 toString() 时。你会得到类似 [B@7764dc81.

的东西

数组中的实际值不是文本表示的一部分，因此如果您收到 [B@7764dc81，那么您已经丢失了所有值。

Answer 3

您不能将字节（二进制）用作字符串。是个误会。

你应该转换它。几种礼仪。例如 Base64 或 Hexa

使用 base64，它给出了这个：

import javax.xml.bind.DatatypeConverter ;

byte[] bt= ... // what you get

// Conversion B64
String encodedb64=DatatypeConverter.printBase64Binary(bt);

// CONVERSION base 64 => byte => String
// base 64 => byte
byte [] byteArrayreverse=DatatypeConverter.parseBase64Binary(encodedb64);

JAVA 中 String 到 byte[] 和 byte[] 到 String 的相互转换

Interconversion of String into byte[] and byte[] into String in JAVA

java

string

byte