[SpringBoot][2][SpringBoot开发环境搭建和基本开发]
第 2 章 SpringBoot开发环境搭建和基本开发
2.1 搭建SpringBoot开发环境
点此链接
2.2 SpringBoot的依赖和自动配置
下面需要讨论为什么SpringBoot项目可以在很少配置下运行
首先我们查看spring-boot-starter-web的pom.xml文件
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| <?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starters</artifactId>
<version>2.2.4.RELEASE</version>
</parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.2.4.RELEASE</version>
<name>Spring Boot Web Starter</name>
<description>Starter for building web, including RESTful, applications using Spring
MVC. Uses Tomcat as the default embedded container</description>
<url>https://projects.spring.io/spring-boot/#/spring-boot-parent/spring-boot-starters/spring-boot-starter-web</url>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0</url>
</license>
</licenses>
<developers>
<developer>
<name>Pivotal</name>
<email>info@pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-projects/spring-boot.git</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-projects/spring-boot.git</developerConnection>
<url>https://github.com/spring-projects/spring-boot</url>
</scm>
<issueManagement>
<system>Github</system>
<url>https://github.com/spring-projects/spring-boot/issues</url>
</issueManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.2.4.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-json</artifactId>
<version>2.2.4.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<version>2.2.4.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.2.4.RELEASE</version>
<scope>compile</scope>
<exclusions>
<exclusion>
<artifactId>tomcat-embed-el</artifactId>
<groupId>org.apache.tomcat.embed</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.3.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.3.RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
|
- 从这里可以看出，当加入
spring-boot-starter-web后，它会通过Maven将对应的资源加载到我们的工程中，这样就可以形成依赖
- 于此同时在
spring-boot-autoconfigure包中，SpringBoot帮我们做了很多自动的配置，由下图所示
- 上面两条就是为什么在没有任何配置下
Springboot可以启动SpringMVC项目
2.3 使用自定义配置
有的时候，我们需要对Springboot提供的默认配置进行修改来适应个性化的要求，再写可以通过application.properties来实现。
比如我们可以这样定义这个文件
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| server.port=8090
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/cosmetic_store?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
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- 这个文件主要用于我们进行自定义配置
- 这个配置文件，定义了服务器的端口，
springmvc的视图解析器，以及数据库连接等相关内容
2.4 开发自己的SpringBoot项目
具体可见此项目hellospringboot
