To encrypt entity beans, BaseTypeHandler is used to AES encrypt sensitive fields.

In response to customer requirements, sensitive information needs to be encrypted and decrypted for display on the page, such as username, mobile phone number and other sensitive information. How to process multiple fields:

1. There is a TypeHandler in Mybatis that can solve this problem. You only need to use @TableField(typeHandler = AesTypeHandler.class) on the field that needs to be encrypted/decrypted (AesTypeHandler is a custom TypeHandler), and use @TableName on the entity containing the field. (autoResultMap = true), or you can use resultMap for mapping

First introduce Hutool’s AES encryption tool

 <dependency>
       <groupId>cn.hutool</groupId>
       <artifactId>hutool-all</artifactId>
       <version>5.7.9</version>
 </dependency>

Create encryption tool class

package com.test.hello.utils;

import cn.hutool.core.util.HexUtil;
import cn.hutool.crypto.SecureUtil;
import org.apache.commons.lang3.StringUtils;

public class AESUtil {
    private static final String AES_KEY = "key自定义16位即可";

    public static String Encrypt(String sSrc) {
        try {
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            //"算法/模式/补码方式"
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
            //此处使用BASE64做转码功能，同时能起到2次加密的作用。
            return new Base64().encodeToString(encrypted);
        } catch (Exception e) {
            return null;
        }
    }

    // 解密
    public static String Decrypt(String sSrc)  {
        try {
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            //先用base64解密
            byte[] encrypted1 = new Base64().decode(sSrc);
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }

Create a custom AesTypeHandler

package com.test.hello.config;

import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.qjc.utils.AESUtil;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;
import org.apache.ibatis.type.MappedTypes;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/** 数据库中的数据类型 */
@MappedJdbcTypes(JdbcType.VARCHAR)
/** 处理后的数据类型 */
@MappedTypes(value = String.class)
public class AesTypeHandler extends BaseTypeHandler {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, AESUtil.encrypt((String) parameter));
    }

    @Override
    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return StringUtils.isBlank(rs.getString(columnName)) ? rs.getString(columnName) : AESUtil.decrypt(rs.getString(columnName));
    }

    @Override
    public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return StringUtils.isBlank(rs.getString(columnIndex)) ? rs.getString(columnIndex) : AESUtil.decrypt(rs.getString(columnIndex));
    }

    @Override
    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return StringUtils.isBlank(cs.getString(columnIndex)) ? cs.getString(columnIndex) : AESUtil.decrypt(cs.getString(columnIndex));
    }
}

Use on entity

package com.test.hello.entity;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.activerecord.Model;

import java.time.LocalDateTime;

import com.qjc.config.AesTypeHandler;
import lombok.Data;
import lombok.EqualsAndHashCode;


@Data
@EqualsAndHashCode(callSuper = true)
@TableName(value = "base_user", autoResultMap = true)
public class BaseUser extends Model {

    private static final long serialVersionUID = 1L;

    @TableId("id")
    private Long id;

    @TableField(typeHandler = AesTypeHandler.class)
    private String name;

    @TableField(typeHandler = AesTypeHandler.class)
    private String phone;


}