在MyBatis中处理MEDIUMBLOB
类型的数据时,加密和解密通常需要在Java代码中手动进行,因为MyBatis本身并不直接提供加密和解密的内置方法。MEDIUMBLOB
类型用于存储二进制大对象,如图片或视频等。
以下是一个使用AES加密和解密MEDIUMBLOB
数据的示例:
pom.xml
中添加以下依赖:<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.68</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.68</version>
</dependency>
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class AESUtil {
private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
public static String encrypt(String data, String key) throws Exception {
IvParameterSpec iv = new IvParameterSpec("1234567812345678".getBytes(StandardCharsets.UTF_8));
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(data.getBytes());
return Base64.getEncoder().encodeToString(encrypted);
}
}
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class AESUtil {
// ... 其他代码保持不变
public static String decrypt(String encryptedData, String key) throws Exception {
IvParameterSpec iv = new IvParameterSpec("1234567812345678".getBytes(StandardCharsets.UTF_8));
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] original = cipher.doFinal(Base64.getDecoder().decode(encryptedData));
return new String(original);
}
}
在你的Mapper XML文件中,你可以使用<resultMap>
元素来映射MEDIUMBLOB
类型的字段到Java对象。然后,在Java代码中,你可以使用上述加密和解密方法来处理这些字段。
<resultMap id="yourResultMap" type="com.example.YourModel">
<id property="id" column="id"/>
<result property="blobData" column="blob_data" javaType="java.sql.Blob"/>
</resultMap>
<select id="selectYourData" resultMap="yourResultMap">
SELECT blob_data FROM your_table WHERE id = #{id}
</select>
<update id="updateYourData">
UPDATE your_table SET blob_data = #{blobData, jdbcType=BLOB} WHERE id = #{id}
</update>
在Java代码中:
// 查询数据
YourModel model = sqlSession.selectOne("com.example.YourMapper.selectYourData", id);
// 加密blobData
String encryptedData = AESUtil.encrypt(model.getBlobData().getBytes(), "yourEncryptionKey");
// 更新数据
sqlSession.update("com.example.YourMapper.updateYourData", new YourModel(encryptedData, model.getId()));
// 查询数据以验证
YourModel updatedModel = sqlSession.selectOne("com.example.YourMapper.selectYourData", id);
String decryptedData = AESUtil.decrypt(updatedModel.getBlobData(), "yourEncryptionKey");
请注意,上述示例仅用于演示目的,实际应用中可能需要考虑更多的安全因素,如密钥管理、初始化向量(IV)的生成和存储等。