IntelliJ IDEA 2017版 SpringBoot的核心配置详解

Spring Boot的核心

（1）Spring Boot的项目一般都会有*Application的入口类，入口类中会有main方法，这是一个标准的Java应用程序的入口方法。

（2）@SpringBootApplication注解是Spring Boot的核心注解，它其实是一个组合注解：

因为@SpringBootApplication注解包含了@Configuration注解的内容，所以

在Spring Boot项目中推荐使用@ SpringBootConfiguration替代@Configuration
@ComponentScan：默认扫描@SpringBootApplication所在类的同级目录以及它的子目录。

（3）@EnableAutoConfiguration：启用自动配置，该注解会使Spring Boot根据项目中依赖的jar包自动配置项目的配置项

（4）因继承省略的注解

实战例子:

Pom.需要注释

 <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-tomcat</artifactId>

             <!--<scope>provided</scope>-->

         </dependency>

Pom完整版

 <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>com.example</groupId>

     <artifactId>20180401</artifactId>

     <version>0.0.1-SNAPSHOT</version>

     <packaging>war</packaging>

     <name>20180401three</name>

     <description>Demo project for Spring Boot</description>

     <parent>

         <groupId>org.springframework.boot</groupId>

         <artifactId>spring-boot-starter-parent</artifactId>

         <version>2.0.0.RELEASE</version>

         <relativePath/> <!-- lookup parent from repository -->

     </parent>

     <properties>

         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

         <java.version>1.8</java.version>

     </properties>

     <dependencies>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-web</artifactId>

         </dependency>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-tomcat</artifactId>

             <!--<scope>provided</scope>-->

         </dependency>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-test</artifactId>

             <scope>test</scope>

         </dependency>

     </dependencies>

     <build>

         <plugins>

             <plugin>

                 <groupId>org.springframework.boot</groupId>

                 <artifactId>spring-boot-maven-plugin</artifactId>

             </plugin>

         </plugins>

     </build>

 </project>

Application

 package com.example.demo;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.SpringBootConfiguration;

 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.ResponseBody;

 @Controller

 @SpringBootApplication

 @SpringBootConfiguration

 @EnableAutoConfiguration

 @ComponentScan

 public class Application {

     @RequestMapping("hello")

     @ResponseBody

     public String hello(){

         return "hello world！";

     }

     public static void main(String[] args) {

         SpringApplication.run(Application.class, args);

     }

 }

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巴特西

IntelliJ IDEA 2017版 SpringBoot的核心配置详解

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