Java中数据库加密的方式有哪些

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

/**
 * 对称加密工具类
 */
public class SymmetricEncoder {
    private static final String ENCODE_TYPE = "AES";
    private static final String ENCODE_RULES = "wxyKey_676767";

    /**
     * 加密
     */
    public static byte[] AESEncode(String content) throws Exception {
        KeyGenerator keygen = KeyGenerator.getInstance(ENCODE_TYPE);
        keygen.init(128);
        Key key = new SecretKeySpec(ENCODE_RULES.getBytes(), ENCODE_TYPE);
        Cipher cipher = Cipher.getInstance(ENCODE_TYPE);
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] result = cipher.doFinal(content.getBytes());
        return result;
    }

    /**
     * 解密
     */
    public static byte[] AESDecode(byte[] content) throws Exception {
        KeyGenerator keygen = KeyGenerator.getInstance(ENCODE_TYPE);
        keygen.init(128);
        Key key = new SecretKeySpec(ENCODE_RULES.getBytes(), ENCODE_TYPE);
        Cipher cipher = Cipher.getInstance(ENCODE_TYPE);
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] result = cipher.doFinal(content);
        return result;
    }
}

import java.security.*;
import javax.crypto.Cipher;

public class RSAUtil {

    private static final String ALGORITHM = "RSA";

    /**
     * 公钥加密
     *
     * @param data      待加密数据
     * @param publicKey 公钥
     * @return
     */
    public static byte[] encrypt(byte[] data, PublicKey publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        return cipher.doFinal(data);
    }

    /**
     * 私钥解密
     *
     * @param data       待解密数据
     * @param privateKey 私钥
     * @return
     */
    public static byte[] decrypt(byte[] data, PrivateKey privateKey) throws Exception {
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(data);
    }

    /**
     * 生成密钥对
     *
     * @return
     */
    public static KeyPair generateKeyPair() throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM);
        keyPairGenerator.initialize(2048);
        return keyPairGenerator.generateKeyPair();
    }
}

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
    public static String md5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            StringBuffer hexString = new StringBuffer();
            for (int i = 0; i < messageDigest.length; i++) {
                String hex = Integer.toHexString(0xff & messageDigest[i]);
                if (hex.length() == 1) hexString.append('0');
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }
}