4.IOC创建对象的过程
- 使用无参构造创造
![[spring]spring注入属性值的两种方式以及作用域](https://s2.loli.net/2022/07/23/tWIeyO8b7gJhzxd.png)
![[spring]spring注入属性值的两种方式以及作用域](https://www.johngo689.com/wp-content/themes/justnews/themer/assets/images/lazy.png)
![[spring]spring注入属性值的两种方式以及作用域](https://s2.loli.net/2022/07/23/E7caZvBAO3wnLip.png)
设定为有参后，就会报错！
对象在被注册进去的时候，就被实例化了，直接使用就好。
5.IO注入
（1）前面的构造器注入
（2）set注入
构造注入对象之间的关系为组合
set注入的对象之间的关系为聚合
（3）p命名空间注入
- 使用set方式注入
（4）c命名空间注入
- 使用构造器方式注入，开启构造器才能用
HelloSpring(String name){
this.name=name;
}
HelloSpring(){
}
注意导入头文件
xmlns:p = "http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c"
6.作用域
ScopeDescription
(Default) Scopes a single bean definition to a single object instance for each Spring IoC container.
Scopes a single bean definition to any number of object instances.
Scopes a single bean definition to the lifecycle of a single HTTP request. That is, each HTTP request has its own instance of a bean created off the back of a single bean definition. Only valid in the context of a web-aware Spring ApplicationContext.
Scopes a single bean definition to the lifecycle of an HTTP Session. Only valid in the context of a web-aware Spring ApplicationContext.
Scopes a single bean definition to the lifecycle of a ServletContext. Only valid in the context of a web-aware Spring ApplicationContext.
Scopes a single bean definition to the lifecycle of a WebSocket. Only valid in the context of a web-aware Spring ApplicationContext.
- 单例
**
- 原型
Original: https://www.cnblogs.com/lumanmanqixiuyuanxi/p/16521971.html
Author: 路漫漫qixiuyuanxi
Title: [spring]spring注入属性值的两种方式以及作用域
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