问题导入
学习了SpringBoot入门案例之后,感觉对比SpringMVC哪一个更加方便简洁?
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SpringBoot是由Pivotal团队提供的全新框架,其设计目的是用来简化Spring应用的初始搭建以及开发过程
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Spring程序缺点
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配置繁琐
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依赖设置繁琐
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SpringBoot程序优点
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自动配置
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起步依赖(简化依赖配置)
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辅助功能(内置服务器,……)
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2.1 起步依赖
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starter
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SpringBoot中常见项目名称,定义了当前项目使用的所有项目坐标,以达到减少依赖配置的目的
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<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.0</version>
</parent>
<groupId>com.itheima</groupId>
<artifactId>springboot-01-quickstart</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.5.0</version>
<packaging>pom</packaging>
<properties>
<servlet-api.version>4.0.1</servlet-api.version>
...
</properties>
</project>
parent
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所有SpringBoot项目要继承的项目,定义了若干个坐标版本号(依赖管理,而非依赖),以达到减少依赖冲突的目的
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spring-boot-starter-parent(2.5.0)与 spring-boot-starter-parent(2.4.6)共计57处坐标版本不同
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.5.0</version>
</parent>
<artifactId>spring-boot-starter-parent</artifactId>
<packaging>pom</packaging>
...
</project>
实际开发
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使用任意坐标时,仅书写GAV中的G和A,V由SpringBoot提供
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如发生坐标错误,再指定version(要小心版本冲突)
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet-api.version}</version>
</dependency>
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.0</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
2.2 辅助功能
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SpringBoot程序启动
@SpringBootApplication
public class Springboot01QuickstartApplication {
public static void main(String[] args) {
SpringApplication.run(Springboot01QuickstartApplication.class, args);
}
}
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SpringBoot在创建项目时,采用jar的打包方式
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SpringBoot的引导类是项目的入口,运行main方法就可以启动项目
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使用maven依赖管理变更起步依赖项文章来源:https://www.toymoban.com/news/detail-665605.html
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Jetty比Tomcat更轻量级,可扩展性更强(相较于Tomcat),谷歌应用引擎(GAE)已经全面切换为Jetty文章来源地址https://www.toymoban.com/news/detail-665605.html
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!--web起步依赖环境中,排除Tomcat起步依赖-->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--添加Jetty起步依赖,版本由SpringBoot的starter控制-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
</dependencies>
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