spring DI依赖注入

1、官网

https://docs.spring.io/spring/docs/5.2.7.RELEASE/spring-framework-reference/core.html#beans-dependencies

2、构造器注入（前面有）

3、Set方式注入（重点）

A、依赖 ： bean对象 依赖 容器 创建

B、注入： bean对象的属性，由容器注入

https://docs.spring.io/spring/docs/5.2.7.RELEASE/spring-framework-reference/core.html#beans-factory-properties-detailed

案例

a、pojo

Address.java

package com.wt.pojo;

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Address{" +
                "address=‘" + address + ‘‘‘ +
                ‘}‘;
    }
}