springboot起步配置和自动配置原理

落日映苍穹つ 2024-04-18 17:56 14阅读 0赞

# 一、起步配置 #

1、起步配置Ctrl+左键进入  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70]  
2、springboot自动识别resources目录下以application开头的配置文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 1]

3、spring-boot-starter-parent又继承了spring-boot-dependencies  
Ctrl + 左键进入  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 2]  
4、springboot默认配置了其他技术的坐标，并且已经解决冲突，不需要我们进行版本控制  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 3]  
5、回到pom文件点击进入web起步依赖  
![在这里插入图片描述][20190910120150354.png]  
里面依赖了springmvc的坐标  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 4]  
还有json和内置tomcat  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 5]

# 二、自动配置 #

1、打开引导类左击进入@SpringBootApplication  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 6]  
@SpringBootConfiguration 类似于Spring自动配置中的@Configuration  
@ComponentScan 扫描@controller和@Service等组件（扫描其所在的包及其子包下的注解）  
@EnableAutoConfiguration 自动配置的核心

2、找到双击打开（里面都是一些技术的自动配置）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 7]  
3、找一个熟悉的注解 Shift+Shift搜索  
![在这里插入图片描述][20190910142121173.png]

4、点击进入  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 8]  
5、意思是 配置要有server前缀再加port  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 9]

6、找到默认配置的json，server.port默认配置为8080  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTY5OTU2Mg_size_16_color_FFFFFF_t_70 10]  
7、可覆盖默认配置：  
![在这里插入图片描述][20190910142342356.png]

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[20190910120150354.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/107027a851f04945bfffa277a8de7c19.png
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[20190910142121173.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/8441bb2019274dba80f6c00be9b22bbe.png
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[20190910142342356.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/5cfc60aacd8f417f8e96d4a9ecf2a468.png