如何使用 IoC

创建Maven工程，pom.xml添加依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.min</groupId>

    <artifactId>Spring-Study</artifactId>

    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>5.0.11.RELEASE</version>

        </dependency>

    </dependencies>

</project>

创建实体类 Student

package com.min.entity;

import lombok.Data;

@Data

public class Student {

    private long id;

    private String name;

    private int age;

}

传统的开发方式，手动 new Student

Student student = new Student();

student.setId(1L);

student.setName("张三");

student.setAge(22);

System.out.println(student);

通过 IoC 创建对象，在配置文件中添加需要管理的对象，XML 格式的配置文件，文件名可以自定义。

<?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:context="http://www.springframework.org/schema/context"

       xmlns:p="http://www.springframework.org/schema/p"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <bean id="student" class="com.southwind.entity.Student">

        <property name="id" value="1"></property>

        <property name="name" value="张三"></property>

        <property name="age" value="22"></property>

    </bean>

</beans>

从 IoC 中获取对象，通过 id 获取。

//加载配置文件

ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");

Student student = (Student) applicationContext.getBean("student");

System.out.println(student);

巴特西

如何使用 IoC

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