Mybatis 的 TypeHandler 加解密

1、编写一个实体类，凡是此实体类的数据都表示需要加解密的

@Data
@AllArgsConstructor
public class Encrypt {
    private String value;
}

　　

2、编写一个加解密的TypeHandler

/**
 * 加解密TypeHandler
 */
@MappedJdbcTypes(JdbcType.VARCHAR)
@MappedTypes(Encrypt.class)
public class EncryptTypeHandler extends BaseTypeHandler<Encrypt> {

    private static final byte[] KEYS = "12345678abcdefgh".getBytes(StandardCharsets.UTF_8);

    /**
     * 设置参数
     */
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Encrypt parameter, JdbcType jdbcType) throws SQLException {
        if (parameter == null || parameter.getValue() == null) {
            ps.setString(i, null);
            return;
        }
        AES aes = SecureUtil.aes(KEYS);
        String encrypt = aes.encryptHex(parameter.getValue());
        ps.setString(i, encrypt);
    }

    /**
     * 获取值
     */
    @Override
    public Encrypt getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return decrypt(rs.getString(columnName));
    }

    /**
     * 获取值
     */
    @Override
    public Encrypt getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return decrypt(rs.getString(columnIndex));
    }

    /**
     * 获取值
     */
    @Override
    public Encrypt getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return decrypt(cs.getString(columnIndex));
    }

    public Encrypt decrypt(String value) {
        if (null == value) {
            return null;
        }
        return new Encrypt(SecureUtil.aes(KEYS).decryptStr(value));
    }
}

• @MappedTypes：表示该处理器处理的java类型是什么。

• @MappedJdbcTypes：表示处理器处理的Jdbc类型。

3、sql语句中写法

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xc.xcspringboot.mapper.customer.CustomerMapper">

    <resultMap id="BaseResultMapper" type="com.xc.xcspringboot.model.customer.Customer">
        <id column="id" property="id"/>
        <result column="phone" property="phone"/>
        <result column="address" property="address"/>
    </resultMap>

    <insert id="addCustomer">
        insert into customer(phone, address)
        values (#{phone}, #{address})
    </insert>

    <select id="findCustomer" resultMap="BaseResultMapper">
        select *
        from customer
        where phone = #{phone}
    </select>

</mapper>

SQL中没有什么特殊的写法。

4、配置文件中指定Typehandler的包路径

mybatis:
  type-handlers-package: com.xc.xcspringboot.typehandler

　　

5、编写后台代码

@RestController
public class CustomerController {

    @Autowired
    private CustomerMapper customerMapper;

    @ApiOperation(value = "addCustomer", notes = "")
    @GetMapping("addCustomer")
    public String addCustomer(@RequestParam("phone") String phone, @RequestParam("address") String address) {
        int result = customerMapper.addCustomer(new Encrypt(phone), address);
        return "添加结果: " + result;
    }

    @ApiOperation(value = "findCustomer", notes = "")
    @GetMapping("findCustomer")
    public Customer findCustomer(@RequestParam("phone") String phone) {
        return customerMapper.findCustomer(new Encrypt(phone));
    }
}

　　

文章来源:https://juejin.cn/post/6963811586184052767