创建简单的SpringBoot父项目

创建父工程

1、创建maven的jar工程项目
2、pom.xml添加依赖

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.zichen</groupId>
  <artifactId>springboot-parent</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>

  <dependencyManagement>
      <dependencies>
          <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.6.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
          </dependency>
      </dependencies>
  </dependencyManagement>

  <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
      </plugins>
  </build>
</project>

SpringBoot整合测试

<!-- springboot-web -->
  	<dependency>
  		<groupId>org.springframework.boot</groupId>
  		<artifactId>spring-boot-starter-web</artifactId>
  	</dependency>
  	<!-- springboot-test -->
  	<dependency>
    		<groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
          <scope>test</scope>
    </dependency>

@SpringBootApplication注解

Springboot的启动类可以是非常简单，其中最关键的两部分是Annotation定义(@SpringBootApplication)和类定义(SpringApplication.run)，这篇文章主要分析其@SpringBootApplication注解,后续文章再接着分析其类定义。

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

SpringBootApplication

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
    excludeFilters = {@Filter(
    type = FilterType.CUSTOM,
    classes = {TypeExcludeFilter.class}
), @Filter(
    type = FilterType.CUSTOM,
    classes = {AutoConfigurationExcludeFilter.class}
)}
)
public @interface SpringBootApplication {
    .....
}

看似有这么多注解，实际上@SpringBootApplication是一个"三体"结构，重要的只有三个Annotation：

• @Configuration
• @EnableAutoConfiguration
• @ComponentScan