如何获得DES加密的密钥?请教高人

public class DESkey {
public DESkey() {
File file1 = new File("E:\\java_project\\xml\\xxx\\template\\1.xml");
File file2 = new File("E:\\java_project\\xml\\xxx\\template\\2.xml");
File file3 = new File("E:\\java_project\\xml\\xxx\\template\\3.xml");
File fileKey = new File("E:\\java_project\\xml\\xxx\\template\\key.txt");
try {
FileInputStream fileIn = new FileInputStream(file1);
KeyGenerator keygen = KeyGenerator.getInstance("DES");
SecretKey deskey = keygen.generateKey();
Cipher cipher = Cipher.getInstance("DES");

FileWriter writeFilekey = new FileWriter(fileKey);
writeFilekey.write(cipher.toString());

cipher.init(Cipher.ENCRYPT_MODE, deskey);
byte[] cipherByte = new byte[(int) file1.length()];
fileIn.read(cipherByte);
cipherByte = cipher.doFinal(cipherByte);
FileOutputStream fileout = new FileOutputStream(file2);
fileout.write(cipherByte);
fileIn.close();
writeFilekey.close();
fileout.close();

FileInputStream fileIn2 = new FileInputStream(file2);
FileReader readkey = new FileReader(fileKey);
BufferedReader br = new BufferedReader(readkey);
String keystr = br.readLine();
byte[] rawKeyData = keystr.getBytes();
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
try {
SecretKey skey = keyFactory.generateSecret(dks);
Cipher thiskey = Cipher.getInstance("DES");
thiskey.init(Cipher.DECRYPT_MODE, skey);
byte[] cipherByte2 = new byte[(int) file2.length()];
fileIn2.read(cipherByte2);
cipherByte = thiskey.doFinal(cipherByte2); //异常
FileOutputStream fileout2 = new FileOutputStream(file3);
fileout2.write(cipherByte);
fileIn2.close();
fileout2.close();
} catch (InvalidKeySpecException ex) {
ex.printStackTrace();
}

} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} catch (NoSuchPaddingException ex) {
ex.printStackTrace();
} catch (InvalidKeyException ex) {
ex.printStackTrace();
} catch (BadPaddingException ex) {
ex.printStackTrace();
} catch (IllegalBlockSizeException ex) {
ex.printStackTrace();
}
}

public static void main(String[] arg) {
new DESkey();
}
}
这是本人写的一个对XML文件进行加密的程序，此程序现在可以对XML文件进行加密，并且我把加密时候使用的密钥写到一个文件上，在解密的时候读取使用，但是在解密的时候出现异常，好像是说在对文件进行解密的时候使用的密钥和加密的时候不一致，请教高手使用什么方法能使从文件中读出密钥和加密时候使用的一致，谢谢

FileWriter writeFilekey = new FileWriter(fileKey);
writeFilekey.write(cipher.toString());

请问你知道你写了些什么东西到key文件？这不是key

那个是key？

请教高手哪个是key

哎，都没有高手

看我的BLOG:
http://blog.javaresearch.org/page/liaowufeng
基于口令的加解密工具类
4小时搞出来的东东。

SecretKey deskey = keygen.generateKey();
//声称DES密钥
deskey才是加解密用的密钥