SpringBoot2.0.2 Application调用的三种方式

一、注解

          @SpringBootApplication

           点开查看源码是由多个注解合成的注解，其中主要的注解有：
            @SpringBootConfiguration
            @EnableAutoConfiguration
            @ComponentScan


           三个关键的注解：
             @ComponentScan 自动扫描加载进来的包，-----------可以扫描自动加载的bean
            @EnableAutoConfiguration 启动自动配置
           @SpringBootConfiguration 继承了@Configuration，所以可以使用@Configuration内容
          @Configuration是spring提供的注解，@SpringBootConfiguration是springboot提供的注解。效果几乎一样，用哪个看自己的习惯。
二、pom配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5 
 6     <groupId>com.springboot</groupId>
 7     <artifactId>quick_start</artifactId>
 8     <version>0.0.1-SNAPSHOT</version>
 9     <packaging>jar</packaging>
10 
11     <name>quick_start</name>
12     <url>http://maven.apache.org</url>
13     <description>Demo project for Spring Boot</description>
14 
15     <!--<parent>-->
16     <!--<groupId>org.springframework.boot</groupId>-->
17     <!--<artifactId>spring-boot-starter-parent</artifactId>-->
18     <!--<version>2.0.2.RELEASE</version>-->
19     <!--<relativePath/> &lt;!&ndash; lookup parent from repository &ndash;&gt;-->
20     <!--</parent>-->
21 
22     <properties>
23         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
24         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
25         <maven.compiler.source>1.8</maven.compiler.source>
26         <maven.compiler.target>1.8</maven.compiler.target>
27         <java.version>1.8</java.version>
28     </properties>
29 
30     <dependencies>
31         <!--不使用parent方式进行依赖,需要scope和type设置-->
32         <dependency>
33             <groupId>org.springframework.boot</groupId>
34             <artifactId>spring-boot-dependencies</artifactId>
35             <version>2.0.2.RELEASE</version>
36             <scope>import</scope>
37             <type>pom</type>
38         </dependency>
39 
40 
41         <dependency>
42             <groupId>org.springframework.boot</groupId>
43             <artifactId>spring-boot-starter-web</artifactId>
44         </dependency>
45 
46         <dependency>
47             <groupId>org.springframework.boot</groupId>
48             <artifactId>spring-boot-starter-test</artifactId>
49             <scope>test</scope>
50         </dependency>
51     </dependencies>
52 
53     <build>
54         <plugins>
55             <plugin>
56                 <groupId>org.springframework.boot</groupId>
57                 <artifactId>spring-boot-maven-plugin</artifactId>
58             </plugin>
59         </plugins>
60     </build>
61 
62 
63 </project>

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