1.创建容器的方式

这是常用的几种创建IOC容器的方式

2. 使用GenericApplicationContext创建IOC容器

package com.limi.test;
import com.limi.entity.Account;
import org.junit.Test;
import org.springframework.context.support.GenericApplicationContext;

public class MyTest {

    @Test
    public void test1(){

        //1. 创建 GenericApplicationContext 对象
        GenericApplicationContext genericApplicationContext = new GenericApplicationContext();

        //2. 调用 context 的方法对象注册
        genericApplicationContext.refresh();  //清空genericApplicationContext创建的容器, 并不会清空其他方式创建的容器
        //将对象实例注册到容器中
        genericApplicationContext.registerBean("account1", Account.class, ()->new Account(9, "lucy", 9.99));

        //3. 从genericApplicationContext创建的IOC容器中获取实例
        Account account = genericApplicationContext.getBean("account1", Account.class);
        System.out.println(account);
    }
}

注意: genericApplicationContext.registerBean(“account1”, Account.class, ()->new Account(9, “lucy”, 9.99)) 中的第一个参数(实例名称)可以不写, 那么默认注册到IOC的对象实例名称为全类名.
修改演示一下

代码

package com.limi.test;
import com.limi.entity.Account;
import org.junit.Test;
import org.springframework.context.support.GenericApplicationContext;

public class MyTest {

    @Test
    public void test1(){

        //1. 创建 GenericApplicationContext 对象
        GenericApplicationContext genericApplicationContext = new GenericApplicationContext();

        //2. 调用 context 的方法对象注册
        genericApplicationContext.refresh();  //清空genericApplicationContext创建的容器, 并不会清空其他方式创建的容器
        //将对象实例注册到容器中
        genericApplicationContext.registerBean(Account.class, ()->new Account(9, "lucy", 9.99));

        //3. 从genericApplicationContext创建的IOC容器中获取实例
        Account account = genericApplicationContext.getBean("com.limi.entity.Account", Account.class);
        System.out.println(account);
    }
}

3.项目代码

Account

package com.limi.entity;

public class Account {

    private Integer id;

    private String name;

    private Double money;

    public Account(Integer id, String name, Double money) {
        this.id = id;
        this.name = name;
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }
}

测试类MyTest

package com.limi.test;
import com.limi.entity.Account;
import org.junit.Test;
import org.springframework.context.support.GenericApplicationContext;

public class MyTest {

    @Test
    public void test1(){

        //1. 创建 GenericApplicationContext 对象
        GenericApplicationContext genericApplicationContext = new GenericApplicationContext();

        //2. 调用 context 的方法对象注册
        genericApplicationContext.refresh();  //清空genericApplicationContext创建的容器, 并不会清空其他方式创建的容器
        //将对象实例注册到容器中
        genericApplicationContext.registerBean(Account.class, ()->new Account(9, "lucy", 9.99));

        //3. 从genericApplicationContext创建的IOC容器中获取实例
        Account account = genericApplicationContext.getBean("com.limi.entity.Account", Account.class);
        System.out.println(account);
    }
}