存在数据库中的数据对于普通用户而言是不可见的，好像是藏起来了一样，但对于开发者，只要知道数据库的连接地址、用户名、密码，则数据不再安全；这也意味着，一旦连接数据库的配置文件暴露出去，则数据不再安全。
应用场景
开发中的数据库配置文件或配置中心中的配置信息
API介绍
MybatisPlus中有个针对配置项加密处理的
代码实现
1.创建mp工程
创建maven工程，结构如下：
2.代码编写
pom.xml
org.springframework.boot spring-boot-starter-web com.baomidou mybatis-plus-boot-starter 3.4.1 mysql mysql-connector-java org.projectlombok lombok provided
application.yml
spring: datasource: url: jdbc:mysql://localhost:3306/springboot?useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai driver-class-name: com.mysql.cj.jdbc.Driver username: root password: rootmybatis-plus: type-aliases-package: com.itheima.pojo
启动类
package com.itheima;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * @version 1.0 * @description 说明 * @package com.itheima */@SpringBootApplication@MapperScan(basePackages = "com.itheima.mapper")public class App { public static void main(String[] args) { SpringApplication.run(App.class,args); }}pojo
package com.itheima.pojo;import com.baomidou.mybatisplus.annotation.TableField;import lombok.Data;/** * @version 1.0 * @description 说明 * @package com.itheima.pojo */@Datapublic class User { private Integer id; private String username; @TableField(select = false) private String password; private String salt;}mapper
package com.itheima.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.itheima.pojo.User;import org.springframework.stereotype.Repository;/** * @version 1.0 * @description 说明 * @package com.itheima.mapper */@Repositorypublic interface UserMapper extends BaseMapper {}
service接口与实现类
package com.itheima.service;import com.baomidou.mybatisplus.extension.service.IService;import com.itheima.pojo.User;/** * @version 1.0 * @description 说明 * @package com.itheima.service */public interface UserService extends IService {}
package com.itheima.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;import com.itheima.mapper.UserMapper;import com.itheima.pojo.User;import com.itheima.service.UserService;import org.springframework.stereotype.Service;/** * @version 1.0 * @description 说明 * @package com.itheima.service.impl */@Servicepublic class UserServiceImpl extends ServiceImpl implements UserService {}
controller
package com.itheima.controller;import com.itheima.pojo.User;import com.itheima.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;/** * @version 1.0 * @description 说明 * @package com.itheima.controller */@RestController@RequestMapping("user")public class UserController { @Autowired private UserService userService; @GetMapping public List listAll(){ return userService.list(); }}启动测试
生成加密后的内容
package com.itheima;import com.baomidou.mybatisplus.core.toolkit.AES;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * @version 1.0 * @description 说明 * @package com.itheima */@SpringBootApplication@MapperScan(basePackages = "com.itheima.mapper")public class App { public static void main(String[] args) { String secretKey = AES.generateRandomKey(); System.out.println("secretKey:" + secretKey); String url = AES.encrypt("jdbc:mysql://localhost:3306/springboot?useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai", secretKey); String username = AES.encrypt("username", secretKey); String password = AES.encrypt("password", secretKey); System.out.println("url=" +url ); System.out.println("username=" +username ); System.out.println("password=" +password ); SpringApplication.run(App.class,args); }}
替换配置文件
spring: datasource: url: mpw:wT9PqZ9Hf4VWgXDuZ/Z1JKfdDyS0sSu3+O2qDkJ/Ulnabpq3z1lZbiThWseQ4DQSx3+SWpufsTysjdYhn6Scsa77AzIIaUgv8DZ17gPxAq88AISmxd9OjxidmY50uBVMkGhP9qAted45zuHBzVrw6Q== driver-class-name: com.mysql.cj.jdbc.Driver username: mpw:Pnh++mI45YrC4s6JveJYaA== password: mpw:Pnh++mI45YrC4s6JveJYaA==mybatis-plus: type-aliases-package: com.itheima.pojo
添加启动参数
运行效果
3.优化
目的
启动时，需要指定密钥才能使用，如果我们把它封装到一个jar里，让它启动时自动去加载密钥，且密钥可配置，那这样就更灵活了。
分析
通过查看MybatisPlus加载的源码，其做解密处理的类如下：
/* * Copyright (c) 2011-2020, baomidou (jobob@qq.com). * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at *
* https://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */package com.baomidou.mybatisplus.autoconfigure;import com.baomidou.mybatisplus.core.toolkit.AES;import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;import com.baomidou.mybatisplus.core.toolkit.StringUtils;import org.springframework.boot.SpringApplication;import org.springframework.boot.env.EnvironmentPostProcessor;import org.springframework.boot.env.OriginTrackedMapPropertySource;import org.springframework.core.env.ConfigurableEnvironment;import org.springframework.core.env.MapPropertySource;import org.springframework.core.env.PropertySource;import org.springframework.core.env.SimpleCommandLinePropertySource;import java.util.HashMap;/** * 安全加密处理器 * * @author hubin * @since 2020-05-23 */public class SafetyEncryptProcessor implements EnvironmentPostProcessor { @Override public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) { /** * 命令行中获取密钥 */ String mpwKey = null; for (PropertySource ps : environment.getPropertySources()) { if (ps instanceof SimpleCommandLinePropertySource) { SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps; mpwKey = source.getProperty("mpw.key"); break; } } /** * 处理加密内容 */ if (StringUtils.isNotBlank(mpwKey)) { HashMap map = new HashMap<>(); for (PropertySource ps : environment.getPropertySources()) { if (ps instanceof OriginTrackedMapPropertySource) { OriginTrackedMapPropertySource source = (OriginTrackedMapPropertySource) ps; for (String name : source.getPropertyNames()) { Object value = source.getProperty(name); if (value instanceof String) { String str = (String) value; if (str.startsWith("mpw:")) { map.put(name, AES.decrypt(str.substring(4), mpwKey)); } } } } } // 将解密的数据放入环境变量，并处于第一优先级上 if (CollectionUtils.isNotEmpty(map)) { environment.getPropertySources().addFirst(new MapPropertySource("custom-encrypt", map)); } } }}
其使用了SPI原理，在类所在的jar下的META-INF/spring.factories中配置了这个SafetyEncryptProcessor。那我们能否也来定义一个这样的配置处理器，判断环境配置中是否配置了–mpw.key，如果没有配置，则给它配置上，这样就不用在启动时添加参数来运行了。
实现
创建配置工程mysafe
代码清单
pom.xml
spring-boot-starter-parent org.springframework.boot 2.3.8.RELEASE org.springframework.boot spring-boot-starter
SafetyEncryptProcessor
package com.itheima;import org.springframework.boot.SpringApplication;import org.springframework.boot.env.EnvironmentPostProcessor;import org.springframework.core.Ordered;import org.springframework.core.env.ConfigurableEnvironment;import org.springframework.core.env.PropertySource;import org.springframework.core.env.SimpleCommandLinePropertySource;import org.springframework.core.io.ClassPathResource;import org.springframework.util.StringUtils;import java.io.IOException;import java.util.Properties;/** * @version 1.0 * @description 说明 * @package com.itheima */public class SafetyEncryptProcessor implements EnvironmentPostProcessor, Ordered { @Override public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) { Properties pro = new Properties(); try { pro.load(new ClassPathResource("ert.properties").getInputStream()); } catch (IOException e) { e.printStackTrace(); } /** * 命令行中获取密钥 */ String mpwKey = null; for (PropertySource ps : environment.getPropertySources()) { if (ps instanceof SimpleCommandLinePropertySource) { SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps; mpwKey = source.getProperty("mpw.key"); break; } } if(StringUtils.isEmpty(mpwKey)){ environment.getPropertySources().addFirst(new SimpleCommandLinePropertySource("mySpringApplicationCommandLineArgs", "--mpw.key=" + pro.getProperty("ert.version"))); } } @Override public int getOrder() { return 0; }}spring.factories
“`.properties
ert.version=b440fe7fd55dbe26
org.springframework.boot.env.EnvironmentPostProcessor=\
com.itheima.SafetyEncryptProcessor
“`
ert.properties
“`properties
ert.version=2ac6625cb3188f52
“`
安装到本地仓库
修改mp工程添加依赖
修改pom.xml，添加mysafe的依赖
com.itheima mysafe 1.0-SNAPSHOT
4.测试结果
去除启动时的参数设置。再启动后访问页面、效果如下：
总结
1.MybatisPlus利用了springboot的配置信息增强器与SPI机制来实现对配置文件中敏感数据的解密处理。
2.mysafe工程打成的jar包，将来就上传到企业的内部服务器上，当密钥变更时，重新打包即可。
3.而我们将来布署项目到服务器上时，也肯定存在配置文件，一旦配置信息暴露，则数据库就危险了。通过加密手段能够让破解者增加破解阻碍。
4.此次练习仅做抛砖引玉作用，关于加密与解密是没有做到那么严谨的，需要结合自己公司实际情况去调整。
ISP经营许可证：豫B-20160281