java实现MySQL数据加密存储---自定义注解+自定义mybatis拦截器

思路  调用拦截器 实现加解密

通过自定义加解密拦截器  判断是否是 加解密实体类 的字段   调用 加解密处理类 执行具体算法加解密

自定义类注解 

/**
 * 注解敏感信息类的注解
 */
@Inherited
@Target({ ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface SensitiveData {
}
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自定义字段注解

/**
 * 注解敏感信息类中敏感字段的注解
 */
@Inherited
@Target({ ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface SensitiveField {
}
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实体类加上  自定义类注解    字段加上 自定义字段注解

@SensitiveData
@TableName(value ="vip_card")
@Data
public class VipCardVO implements Serializable {
    /**
     * 主键
     */
    @TableId(type = IdType.AUTO)
    private Integer id;

    /**
     * 卡号
     */
    @SensitiveField
    private String cardNo;

    /**
     * 用户名
     */
    @SensitiveField
    private String name;

    /**
     * 性别
     */
    private Integer gender;

    /**
     * 年龄
     */
    private Integer age;

    /**
     * 邮箱
     */
    private String email;

    /**
     * 身份证号
     */

    private String idNumber;

    /**
     * 地址
     */

    private String address;

    /**
     * 手机号
     */

    private String phoneNumber;

    /**
     * 创建时间
     */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="Asia/Shanghai")
    private Date createTime;

    /**
     * 更新时间
     */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="Asia/Shanghai")
    private Date updateTime;
}
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加解密处理类

@Component
public class AEScrypto {

    private final static String password = "V********=";

    /**
     * 加密
     *
     * @param declaredFields paramsObject所声明的字段
     * @param paramsObject   mapper中paramsType的实例
     * @return T
     * @throws IllegalAccessException 字段不可访问异常
     */
    public static <T> T encrypt(Field[] declaredFields, T paramsObject) throws IllegalAccessException {
        for (Field field : declaredFields) {
            //取出所有被EncryptDecryptField注解的字段
            SensitiveField sensitiveField = field.getAnnotation(SensitiveField.class);
            if (!Objects.isNull(sensitiveField)) {
                field.setAccessible(true);
                Object object = field.get(paramsObject);
                //暂时只实现String类型的加密
                if (object instanceof String) {
                    String value = (String) object;
                    //加密  这里我使用自定义的AES加密工具
                    field.set(paramsObject, AESUtil.encrypt(value,password));
                }
            }
        }
        return paramsObject;
    }
    /**
     * 解密
     *
     * @param result resultType的实例
     * @return T
     * @throws IllegalAccessException 字段不可访问异常
     */
    public static <T> T decrypt(T result) throws IllegalAccessException {
        //取出resultType的类
        Class<?> resultClass = result.getClass();
        Field[] declaredFields = resultClass.getDeclaredFields();
        for (Field field : declaredFields) {
            //取出所有被EncryptDecryptField注解的字段
            SensitiveField sensitiveField = field.getAnnotation(SensitiveField.class);
            if (!Objects.isNull(sensitiveField)) {
                field.setAccessible(true);
                Object object = field.get(result);
                //只支持String的解密
                if (object instanceof String) {
                    String value = (String) object;
                    //对注解的字段进行逐一解密
                    field.set(result, AESUtil.decrypt(value,password));
                }
            }
        }
        return result;
    }
}
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加解密工具算法工具类

public class AESUtil {

    private static final String KEY_ALGORITHM = "AES";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默认的加密算

    /**
     * AES 加密操作
     *
     * @param content
     * @param password
     * @return
     */
    public static String encrypt(String content, String password) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);

            byte[] byteContent = content.getBytes("utf-8");

            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));// 初始化为加密模式的密码器

            byte[] result = cipher.doFinal(byteContent);// 加密


            String encode = Base64.getEncoder().encodeToString(result);
            //encode.
            return encode;//通过Base64转码返回
        } catch (Exception ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * AES 解密操作
     *
     * @param content
     * @param password
     * @return
     */
    public static String decrypt(String content, String password) {

        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);

            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));

            //执行操作
            byte[] result = cipher.doFinal(Base64.getDecoder().decode(content));

            return new String(result, "utf-8");
        } catch (Exception ex) {
//            log.error(ex.getMessage(),ex);
        }

        return null;
    }
}
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加密拦截器 实现mybatis 拦截器 接口

@Component
@Intercepts({
        @Signature(type = ParameterHandler.class, method = "setParameters", args = PreparedStatement.class),
})
public class EncryptInterceptor implements Interceptor {

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        //@Signature 指定了 type= parameterHandler 后，这里的 invocation.getTarget() 便是parameterHandler 
        //若指定ResultSetHandler ，这里则能强转为ResultSetHandler
        ParameterHandler parameterHandler = (ParameterHandler) invocation.getTarget();
        // 获取参数对像，即 mapper 中 paramsType 的实例
        Field parameterField = parameterHandler.getClass().getDeclaredField("parameterObject");
        parameterField.setAccessible(true);

        //取出实例
        Object parameterObject = parameterField.get(parameterHandler);
        if (parameterObject != null) {
            Class<?> parameterObjectClass = parameterObject.getClass();
            //校验该实例的类是否被@SensitiveData所注解
            SensitiveData sensitiveData = AnnotationUtils.findAnnotation(parameterObjectClass, SensitiveData.class);
            if (Objects.nonNull(sensitiveData)) {
                //取出当前当前类所有字段，传入加密方法
                Field[] declaredFields = parameterObjectClass.getDeclaredFields();
                AEScrypto.encrypt(declaredFields, parameterObject);
            }

        }
        return invocation.proceed();
    }
 
    /**
     * 切记配置，否则当前拦截器不会加入拦截器链
     */
    @Override
    public Object plugin(Object o) {
        return Plugin.wrap(o, this);
    }
 
    /**
     * 自定义配置写入，没有自定义配置的可以直接置空此方法
     */
    @Override
    public void setProperties(Properties properties) {
    }
}
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解密拦截器 实现mybatis 拦截器 接口

@Component
@Intercepts({
        @Signature(type = ResultSetHandler.class, method = "handleResultSets", args = {Statement.class})
})
public class DecryptInterceptor implements Interceptor {
 

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        //取出查询的结果
        Object resultObject = invocation.proceed();
        if (Objects.isNull(resultObject)) {
            return null;
        }
        //基于selectList
        if (resultObject instanceof ArrayList) {
            ArrayList resultList = (ArrayList) resultObject;
            if (!CollectionUtils.isEmpty(resultList) && needToDecrypt(resultList.get(0))) {
                for (Object result : resultList) {
                    //逐一解密
                    AEScrypto.decrypt(result);
                }
            }
        //基于selectOne
        } else {
            if (needToDecrypt(resultObject)) {
                AEScrypto.decrypt(resultObject);
            }
        }
        return resultObject;
    }
 
    private boolean needToDecrypt(Object object) {
        Class<?> objectClass = object.getClass();
        SensitiveData sensitiveData = AnnotationUtils.findAnnotation(objectClass, SensitiveData.class);
        return Objects.nonNull(sensitiveData);
    }
 
 
    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }
 
    @Override
    public void setProperties(Properties properties) {
 
    }
}
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原文地址：https://www.cnblogs.com/wf-zhang/p/14939638.html