DES加密算法（密文只有字符串和数字）java和android加密的结果一致（可放在url中）

import java.security.*;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
* DES加密算法
* 这个加密算法是对称的加密算法
* 这个加密算法，在本系统中的应用，主要是因为该加密算法加密后
* 密文都是字符串和数字的，没有其他字符。这样的密文可以应用在url地址上，
* 不用担心被URL 地址上传递的数字被转义
* @author Administrator
*
*/

public class RDes {
/** 加密算法,可用 DES,DESede,Blowfish. */
private final static String ALGORITHM = "DES";

/**
* DES解密算法
* @param data
* @param cryptKey 密钥 要是偶数
* @return
* @throws Exception
*/
public static String decrypt(String data, String cryptKey) throws Exception {
return new String(decrypt(hex2byte(data.getBytes()),
cryptKey.getBytes()));
}

/**
* DES加密算法
* @param data
* @param cryptKey
* @return
* @throws Exception
*/
public final static String encrypt(String data, String cryptKey)
throws Exception {
return byte2hex(encrypt(data.getBytes(), cryptKey.getBytes()));
}

private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(ALGORITHM);
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(data);
}

private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(ALGORITHM);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
// 现在，获取数据并解密
// 正式执行解密操作
return cipher.doFinal(data);
}

private static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException("长度不是偶数");
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}

private static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
}
return hs.toUpperCase();
}

}

public static void main(String[] args) {
        String cryptKey = "hello@Nh~!@#$%^&*()_++-*/";
        String data = "AHjdkn789+-~!@#$%^&*()+-*/";
        try {
            String t1 = RDes.encrypt(data, cryptKey);
            String t2 = RDes.decrypt(t1, cryptKey);
            System.out.println(t1);
            System.out.println(t2);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String cryptKey = "hello@Nh~!@#$%^&*()_++-*/";
        String data = "AHjdkn789+-~!@#$%^&*()+-*/";
        try {
            String t1 = RDes.encrypt(data, cryptKey);
            String t2 = RDes.decrypt(t1, cryptKey);
            System.out.println("密：" + t1);
            System.out.println("密：" + t2);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }