专题三：Spring容器ApplicationContext初始化

news2025/1/22 18:57:00

前面我们构建好了Spring源码，接下来肯定迫不及待来调试啦，来一起看看大名鼎鼎ApplicationContext

新建模块

1、基础步骤

2、重要文件

build.gradle

plugins {
    id 'java'
}

group = 'org.springframework'
version = '5.2.6.RELEASE'

repositories {
    mavenCentral()
}
// 引入依赖
dependencies {
    testImplementation platform('org.junit:junit-bom:5.9.1')
    testImplementation 'org.junit.jupiter:junit-jupiter'
    compile(project(":spring-context"))
    optional(project(":spring-context"))

}

test {
    useJUnitPlatform()
}

setting.gradle

pluginManagement {
	repositories {
		maven { url 'https://maven.aliyun.com/repository/public/' }
		gradlePluginPortal()
		maven { url 'https://repo.spring.io/plugins-release' }
	}
}
apply from: "$rootDir/gradle/build-cache-settings.gradle"

include "spring-aop"
include "spring-aspects"
include "spring-beans"
include "spring-context"
include "spring-context-support"
include "spring-context-indexer"
include "spring-core"
include "kotlin-coroutines"
project(':kotlin-coroutines').projectDir = file('spring-core/kotlin-coroutines')
include "spring-expression"
include "spring-instrument"
include "spring-jcl"
include "spring-jdbc"
include "spring-jms"
include "spring-messaging"
include "spring-orm"
include "spring-oxm"
include "spring-test"
include "spring-tx"
include "spring-web"
include "spring-webmvc"
include "spring-webflux"
include "spring-websocket"
include "framework-bom"
include "integration-tests"

rootProject.name = "spring"
rootProject.children.each {project ->
	project.buildFileName = "${project.name}.gradle"
}
include 'spring-self'

spring-self.gradle

有个小细节，如果想和spring源码的gradle保持一致，重点看这段代码：

rootProject.name = "spring"
rootProject.children.each {project ->
project.buildFileName = "${project.name}.gradle"
}

此时我们只要将include 'spring-self' 放到这段代码上方即可，这样我们的build.gradle 就可以改成与spring同样的命令风格spring-self.gradle

3、代码编写

代码目录

实体类

public class JmUser {
	private String name;

	private String age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}
}

Xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="jmUser" class="org.springframework.dto.JmUser">
		<property name="name" value="测试一" />
		<property name="age" value="18" />
	</bean>

</beans>

主方法

public class Main {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		JmUser jmUser = (JmUser)context.getBean("jmUser");
		System.out.println(jmUser.getName());
		System.out.println(jmUser.getAge());

	}
}