在java中使用DES算法对数据库进行加密，具体方法如下：

import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DESUtils {
private static Key key;
// 设置密钥key
private static String KEY_STR = "myKey";
private static String CHARSETNAME = "UTF-8";
private static String ALGORITHM = "DES";
// 静态代码块
static {
try {
// 生成DES算法对象
KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
// 运用SHA1安全策略
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
// 设置上密钥种子
secureRandom.setSeed(KEY_STR.getBytes());
// 初始化基于SHA1的算法对象
generator.init(secureRandom);
// 生成密钥对象
key = generator.generateKey();
generator = null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 获取加密后的信息
*
* @param str
* @return
*/
public static String getEncryptString(String str) {
// 基于BASE64编码，接收byte[]并转换为String
BASE64Encoder base64encoder = new BASE64Encoder();
try {
// 按UTF-8编码
byte[] bytes = str.getBytes(CHARSETNAME);
// 获取加密对象
Cipher cipher = Cipher.getInstance(ALGORITHM);
// 初始化密码信息
cipher.init(Cipher.ENCRYPT_MODE, key);
// 加密
byte[] doFinal = cipher.doFinal(bytes);
// byte[] to encode好的String并返回
return base64encoder.encode(doFinal);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
/**
* 获取解密后的信息
*
* @param str
* @return
*/
public static String getDecryptString(String str) {
//基于BASE64编码，接收byte[]并转换为String
BASE64Decoder base64decoder = new BASE64Decoder();
try {
//将字符串decode为byte[]
byte[] bytes = base64decoder.decodeBuffer(str);
//获取解密对象
Cipher cipher = Cipher.getInstance(ALGORITHM);
//初始化解密信息
cipher.init(Cipher.DECRYPT_MODE, key);
//解密
byte[] doFinal = cipher.doFinal(bytes);
//返回解密之后的信息
return new String(doFinal, CHARSETNAME);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
public static void main(String[] args) {
System.out.println(getEncryptString("root"));
System.out.println(getEncryptString("123654"));
}
}