@Value("${name}")
  private String name;

  girl:
    cupSize: b
    age: 18

  @Component
  @ConfigurationProperties(prefix = "girl")
  public class GirlProperties {
      private String cupSize;
      private Integer age;
  }

  // 使用
  @Autowired
  private GirlProperties girlProperties;  // spring自动将配置文件中girl下面的属性读取设置到对象

2. 设置idea允许自动编译`Cmd + shift + a`,输入`make project automatically`回车,勾选`Make Project automatically`
3. 允许idea在运行时编译`Cmd + shift + a`,输入`Registry`回车,勾选`compiler.automake.allow.when.running`
4. 通过idea启动或者`mvn spring-boot:run`启动服务器,修改代码后都会自动编译,热部署生效

# 以jar发布

1. `mvn install`编译打包为jar
2. `java -jar xxx.jar`启动

# 单元测试


# 添加mybatis

1. `pom.xml`添加 依赖

    ```
    <!-- Spring Boot Mybatis -->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>${mybatis-spring-boot}</version>
    </dependency>

    <!-- MySQL 驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql-connector}</version>
    </dependency>
    ```

# mybatis generator插件

1. `pom.xml`添加plugin

    ```
    <plugin>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-maven-plugin</artifactId>
              <version>1.3.2</version>
      <configuration>
        <verbose>true</verbose>
        <overwrite>true</overwrite>
      </configuration>
    </plugin>
    ```

2. 在`resources`目录配置[generatorConfig.xml](https://gitee.com/qiudeqing/mall/blob/master/src/main/resources/generatorConfig.xml)
3. maven运行插件即可根据数据库表结构生成Java bean, 基本的dao和mapper


# 异常处理

1. 新建`src/main/resources/resources/error/404.html`,系统访问触发404错误会根据请求content-type返回对应内容.

# FAQs

## Cannot determine embedded database driver class for database type NONE

原因：没有配置数据库信息