本篇文章是SpringBoot最入门的介绍。我们不借助任何额外的工具，从无到有创建一个Spring Boot的web项目，并运行这个项目。
项目构建
归根结底，Spring Boot就只是一个框架，几个jar而已，没什么神奇的。但使用Spring Initializr创建项目的过程把很多信息屏蔽掉了，这样我们就很难搞清楚Spring Boot的本质是什么。下面仅使用maven从无到有构建一个Spring Boot的web项目。
先创建一个maven空工程如下所示，项目的名字叫spring-boot-hello。
<?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.poype</groupId>
<artifactId>spring-boot-hello</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
</dependencies>
</project>
现在这还是一个空的maven项目，我们可以在dependencies标签中添加我们需要的依赖，例如添加Spring Boot的依赖。但是Spring Boot为了减少配置，方便我们开发，提供了一个parent maven工程spring-boot-starter-parent，我们只要让我们的这个项目继承spring-boot-starter-parent工程，就能减少好多配置。修改我们的POM配置如下：
<?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.poype</groupId>
<artifactId>spring-boot-hello</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
</parent>
<dependencies>
</dependencies>
</project>
目前我们的这个maven项目还没有导入任何dependency，这点可以通过执行mvn dependency:tree命令确定。
我们要创建的是一个web项目，所以添加spring-boot本文来源[email protected]搞@^&代*@码2网-starter-web这个依赖。修改POM配置如下：
<?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.poype</groupId>
<artifactId>spring-boot-hello</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
由于在spring-boot-starter-parent的dependencyManagement中已经用声明了spring-boot-starter-web，所以此处我们可以省略它的version配置。
再次执行mvn dependency:tree命令获得如下结果：
[INFO] Scanning for projects... [INFO] [INFO] --------------------< com.poype:spring-boot-hello >--------------------- [INFO] Building spring-boot-hello 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-dependency-plugin:3.1.1:tree (default-cli) @ spring-boot-hello --- [INFO] com.poype:spring-boot-hello:jar:1.0-SNAPSHOT [INFO] \- org.springframework.boot:spring-boot-starter-web:jar:2.1.4.RELEASE:compile [INFO] +- org.springframework.boot:spring-boot-starter:jar:2.1.4.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot:jar:2.1.4.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-autoconfigure:jar:2.1.4.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter-logging:jar:2.1.4.RELEASE:compile [INFO] | | +- ch.qos.logback:logback-classic:jar:1.2.3:compile [INFO] | | | +- ch.qos.logback:logback-core:jar:1.2.3:compile [INFO] | | | \- org.slf4j:slf4j-api:jar:1.7.26:compile [INFO] | | +- org.apache.logging.log4j:log4j-to-slf4j:jar:2.11.2:compile [INFO] | | | \- org.apache.logging.log4j:log4j-api:jar:2.11.2:compile [INFO] | | \- org.slf4j:jul-to-slf4j:jar:1.7.26:compile [INFO] | +- javax.annotation:javax.annotation-api:jar:1.3.2:compile [INFO] | +- org.springframework:spring-core:jar:5.1.6.RELEASE:compile [INFO] | | \- org.springframework:spring-jcl:jar:5.1.6.RELEASE:compile [INFO] | \- org.yaml:snakeyaml:jar:1.23:runtime [INFO] +- org.springframework.boot:spring-boot-starter-json:jar:2.1.4.RELEASE:compile [INFO] | +- com.fasterxml.jackson.core:jackson-databind:jar:2.9.8:compile [INFO] | | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.9.0:compile [INFO] | | \- com.fasterxml.jackson.core:jackson-core:jar:2.9.8:compile [INFO] | +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.9.8:compile [INFO] | +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.9.8:compile [INFO] | \- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.9.8:compile [INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:2.1.4.RELEASE:compile [INFO] | +- org.apache.tomcat.embed:tomcat-embed-core:jar:9.0.17:compile [INFO] | +- org.apache.tomcat.embed:tomcat-embed-el:jar:9.0.17:compile [INFO] | \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:9.0.17:compile [INFO] +- org.hibernate.validator:hibernate-validator:jar:6.0.16.Final:compile [INFO] | +- javax.validation:validation-api:jar:2.0.1.Final:compile [INFO] | +- org.jboss.logging:jboss-logging:jar:3.3.2.Final:compile [INFO] | \- com.fasterxml:classmate:jar:1.4.0:compile [INFO] +- org.springframework:spring-web:jar:5.1.6.RELEASE:compile [INFO] | \- org.springframework:spring-beans:jar:5.1.6.RELEASE:compile [INFO] \- org.springframework:spring-webmvc:jar:5.1.6.RELEASE:compile [INFO] +- org.springframework:spring-aop:jar:5.1.6.RELEASE:compile [INFO] +- org.springframework:spring-context:jar:5.1.6.RELEASE:compile [INFO] \- org.springframework:spring-expression:jar:5.1.6.RELEASE:compile [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.018 s [INFO] Finished at: 2019-05-19T22:54:50+08:00 [INFO] ------------------------------------------------------------------------
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转载请注明原文链接：Spring Boot Hello World的实现代码
转载请注明原文链接：Spring Boot Hello World的实现代码
