# springlearn

**Repository Path**: dawenxi484/springlearn

## Basic Information

- **Project Name**: springlearn
- **Description**: 学习spring
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-02-23
- **Last Updated**: 2021-02-23

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# SpringIoC容器的源码解析



## SpringIoC容器使用

* 解析配置
* 定位与注册对象
* 注入对象



### 基于xml

1. 编写配置文件

   ```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" xmlns:p="http://www.springframework.org/schema/p"
   	   xmlns:context="http://www.springframework.org/schema/context"
   	   xmlns:task="http://www.springframework.org/schema/task"
   	   xsi:schemaLocation="http://www.springframework.org/schema/beans
       	   http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
              http://www.springframework.org/schema/context
              http://www.springframework.org/schema/context/spring-context-3.1.xsd
              http://www.springframework.org/schema/task
       		http://www.springframework.org/schema/task/spring-task-3.1.xsd">
   
   	<bean id="welcomeService" class="com.example.springdemo.service.impl.WelcomeServiceImpl"></bean>
   
   
   </beans>
   ```

2. 解析配置注入对象

   ```java
   		String xmlPath = "D:\\projects\\IdeaProject\\spring-framework-5.2.10.RELEASE\\spring_demo\\src\\main\\resources\\spring\\spring-config.xml";
   		ApplicationContext applicationContext = new FileSystemXmlApplicationContext(xmlPath);
   		 WelcomeService welcomeService = (WelcomeService)applicationContext.getBean("welcomeService");
   		 welcomeService.sayHello("强大的spring框架");
   ```

   

###  基于注解



```java
@Configuration
@ComponentScan("com.example.springdemo")
public class Entrance {

	public static void main(String[] args) {
        // 指定配置类
		ApplicationContext applicationContext = new AnnotationConfigApplicationContext(Entrance.class);
		String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
		for(String beanDefinitionName: beanDefinitionNames) {
			System.out.println(beanDefinitionName);
		}
		WelcomeController welcomeController = (WelcomeController)applicationContext.getBean("welcomeController");
		welcomeController.handleRequest();
	}

}
```