1.MD5这里就不做描述，详细可以查阅后续文章
2.DES 数据加密处理：如下
import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class test
{
public static void main(String[] args)
throws UnsupportedEncodingException
{
//待加密内容
String str = “我是中国人”;
//密码，长度要是8的倍数
String password = “alnton08″;
byte[] result = desCrypto(str.getBytes(), password);
System.out.println(“加密后内容为：” + new String(result));
//直接将如上内容解密
try
{
byte[] decryResult = decrypt(result, password);
System.out.println(“加密前内容为：” + new String(decryResult));
}
catch (Exception e1)
{
e1.printStackTrace();
}
}
/**
* <对字符串进行Des加密，将字符串转化为字节数组解密>
*/
public static byte[] desCrypto(byte[] datasource, String password)
{
try
{
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(password.getBytes());
//创建一个密匙工厂，然后用它把DESKeySpec转换成
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);
SecretKey securekey = keyFactory.generateSecret(desKey);
//Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(“DES”);
//用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
//现在，获取数据并加密
//正式执行加密操作
return cipher.doFinal(datasource);
}
catch (Throwable e)
{
e.printStackTrace();
}
return null;
}
/**
* <将加密的密文字节数组转化为明文字节数组>
*/
public static byte[] decrypt(byte[] src, String password)
throws Exception
{
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(password.getBytes());
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);
// 将DESKeySpec对象转换成SecretKey对象
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(“DES”);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, random);
// 真正开始解密操作
return cipher.doFinal(src);
}
}