springboot自动配置-实战

直接上图

结构：

mybatis-plus-starter(简称mp)

DateMetaObjectHandler

package com.winshine.mybatisplus.config;

public class DateMetaObjectHandler implements MetaObjectHandler {
    private MybatisPlusAutoFillProperties autoFillProperties;

    public DateMetaObjectHandler(MybatisPlusAutoFillProperties autoFillProperties) {
        this.autoFillProperties = autoFillProperties;
    }

    /**
     * 是否开启了插入填充
     */
    @Override
    public boolean openInsertFill() {
        return autoFillProperties.getEnableInsertFill();
    }

    /**
     * 是否开启了更新填充
     */
    @Override
    public boolean openUpdateFill() {
        return autoFillProperties.getEnableUpdateFill();
    }

    /**
     * 插入填充，字段为空自动填充
     */
    @Override
    public void insertFill(MetaObject metaObject) {
        Object createTime = getFieldValByName(autoFillProperties.getCreateTimeField(), metaObject);
        Object updateTime = getFieldValByName(autoFillProperties.getUpdateTimeField(), metaObject);
        if (createTime == null || updateTime == null) {
            LocalDateTime date = LocalDateTime.now();
            if (createTime == null) {
                setFieldValByName(autoFillProperties.getCreateTimeField(), date, metaObject);
            }
            if (updateTime == null) {
                setFieldValByName(autoFillProperties.getUpdateTimeField(), date, metaObject);
            }
        }
    }

    /**
     * 更新填充
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        setFieldValByName(autoFillProperties.getUpdateTimeField(), new Date(), metaObject);
    }
}

MybatisPlusAutoConfigure

package com.winshine.mybatisplus.config;

@EnableConfigurationProperties(MybatisPlusAutoFillProperties.class)
public class MybatisPlusAutoConfigure {

    @Autowired
    private MybatisPlusAutoFillProperties autoFillProperties;

    /**
     * 分页插件，自动识别数据库类型
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(prefix = "winshine.mybatis-plus.auto-fill", name = "enabled", havingValue = "true", matchIfMissing = true)
    public MetaObjectHandler metaObjectHandler() {
        
        return new DateMetaObjectHandler(autoFillProperties);
    }
}

MybatisPlusAutoFillProperties

package com.winshine.mybatisplus.properties;

@Setter
@Getter
@ConfigurationProperties(prefix = "winshine.mybatis-plus.auto-fill")
@RefreshScope
public class MybatisPlusAutoFillProperties {
    /**
     * 是否开启自动填充字段
     */
    private Boolean enabled = true;
    /**
     * 是否开启了插入填充
     */
    private Boolean enableInsertFill = true;
    /**
     * 是否开启了更新填充
     */
    private Boolean enableUpdateFill = true;
    /**
     * 创建时间字段名
     */
    private String createTimeField = "createTime";
    /**
     * 更新时间字段名
     */
    private String updateTimeField = "updateTime";
}

spring.factories:

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
    com.winshine.mybatisplus.config.MybatisPlusAutoConfigure

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>
    <artifactId>winshine-mybatis-plus-spring-boot-starter</artifactId>
    <groupId>com.winshine</groupId>
    <version>1.0.0.RELEASE</version>
    <packaging>jar</packaging>
    <description>winshine-mybatis-plus通用组件</description>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-context</artifactId>
            <version>2.2.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-extension</artifactId>
            <version>3.4.0</version>
        </dependency>

        <!-- druid 官方 starter -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.22</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.3.10</version>
        </dependency>

    </dependencies>

</project>

testModule 引入mp依赖

测试新增：


mybatis 新增自动注入成功

插曲：

父pom的package为pom ，子testModule的pom打包方式为pom报错

改为jar。即可。
一个大佬说：父pom的打包方式为pom，子pom的打包方式为jar。