Spring源码-使用instanceSupplier传入lambda表达式创建对象

前置准备工作

新建配置文件supplier.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="user" class="com.mashibing.supplier.User"></bean>
    <bean class="com.mashibing.supplier.SupplierBeanFactoryPostProcessor"></bean>
</beans>

public class User {
   
   

    private String username;

    public User() {
   
   
    }

    public User(String username)