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SpringBoot Spring容器bean

望天边星宿 人气:0

一、前期准备

1.1 创建工程

创建springboot项目,springboot版本为2.5.0,引入spring-boot-starter-web依赖,pom文件如下:

<?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 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>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <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>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

1.2 创建Controller

创建一个简单的Controller用于测试

@RestController
public class HelloController {
    public void helloController() {
        System.out.println("创建了");
    }
    @RequestMapping("hello")
    public String hello() {
        return "hello";
    }
}

二、探究过程

2.1 启动类

项目的运行只需要启动类中一行简单的代码,spring容器的创建就是通过SpringApplication.run(SpringbootApplication.class, args)这一行代码实现的。

其实就是调用了静态的run方法,传入了启动类的字节码对象。

2.2 SpringApplication

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