spring-: configuration-with-two-out-of-the-box-solutions

Two solutions configured by Spring Boot

Spring Boot realizes that different projects have different configuration requirements, so two methods are provided:

Manual configuration (
1. ) - For items that need to be refined. @SpringBootConfiguration Automatic configuration (
)
2. - For items that benefit from agreed by the agreed more configuration (that is, less manual settings). @EnableAutoConfiguration Choose depends on the specific needs of the project.

When will it be used?

Use scene	Method	Cause
Need to completely control bean and configuration	>	Manually define all content (just like in the classic Spring project).
Nepring boot automatic configuration commonly used components	>	Save time by automatically configure Bean based on dependencies.
You need to use two methods at the same time	Both methods are used	The automatic configuration has been enabled, but the manual configuration will cover the default value.
need to use specific configuration test Spring Boot applications	>	can be used to use a custom test configuration for unit testing.
Need to disable or adjust automatic configuration	@Enclude = {DataSourceAutoConfiguration.class})	Disable specific automatic configurations as needed.

Practical scene

1️⃣ Full manual configuration (traditional Spring)

If your project needs to be completely controlled (for example, the system migration or highly customized system):

<code class="language-java">@SpringBootConfiguration
public class MyAppConfig {
    @Bean
    public DataSource dataSource() {
        return new HikariDataSource(); // 手动配置数据库
    }
}</code>

No automatic configuration
• : You must manually define all beans. It is very useful when you want to avoid hidden behavior.
2️ 自动 Fully automatic configuration (Spring Boot defaults)

If you want to handle everything in Spring Boot, please use:

<code class="language-java">@SpringBootApplication // 包含 @EnableAutoConfiguration
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}</code>

Automatic configuration database, web server, security, etc.

• Very suitable for fast development and microservices.
3️ 方法 Mixed method (automatic manual configuration)
If you need to configure automatic configuration, but if you want to cover some parts, please perform the following operations:

Manual Bean (

) Prefer to be automatically configured.

<code class="language-java">@SpringBootApplication
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

@Configuration
class ManualConfig {
    @Bean
    public DataSource dataSource() {
        return new HikariDataSource(); // 覆盖默认自动配置的 DataSource
    }
}</code>

Most of the automatic configuration is very good, but when you need to customize the key part, it is very useful.
• dataSource Summary Yes, Spring Boot provides two solutions to solve the configuration problem. The best choice depends on the project's needs:
For rapid development

, use

.

For completely controlling

, use

.
• For a balanced method , let the automatic configuration process most things, but cover it if necessary. ? @EnableAutoConfiguration

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