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SpringBoot notes 01 – Spring IOC 1. IOC 1.1 what is IOC The full name of IOC is Inversion of Control, which is a design concept. In the traditional Java SE code, objects are created through new inside an object, which is the program's initiative to create the objects to rely on. The idea of IOC is to design a container to create these ...

Spring notes 1, Spring understand Spring concept: make the existing technology easier to use, integrate the existing technical framework, and simplify enterprise application development; advantage: Spring is a free and open source framework Spring is a lightweight, non intrusive framework that has no impact after adding the spring framework ...

1, IOC container 1. What is IOC (control reversal) (a) the creation of objects and the calling process between objects are handed over to Spring for management (b) purpose of using IOC: to reduce coupling 2. IOC bottom layer (a) parsing and reflection mode 3. The IOC container provided by Spring is implemented in two ways (two interfaces) ...

1. Spring overview 1.1 INTRODUCTION Spring: Spring - > brings spring to the software industryIn 2002, Rod Jahnson first launched the Spring framework prototype interface21 framework.On March 24, 2004, the Spring framework was redesigned based on the interface21 framework and released the official version of 1.0.It's hard to imagine R ...

Spring IoC container Ioc Inversion of Control is not a technology, but a design idea In the development of Ioc, there is no need to create its own instance object, but a Spring Ioc container. The Spring container is responsible for controlling the relationship between programs, rather than being directly controlled by the code. Therefore, the ...

7, IOC of spring <bean id="hello" class="com.wang.bean.Hello" scope="singleton" init-method="init" autowire="byType" destroy-method="destroy"> <property name="userName" value="spring"></property> </bean> Container usage 1: create the object of the container and t ...

1, How to start the IoC container: 1. Start IoC container in Java environment: ClassPathXmlApplicationContext: load the configuration file from the root path of the class (recommended);FileSystemXmlApplicationContext: load the configuration file from the disk path;AnnotationConfigApplicationContext: start the Spring container in pure anno ...

Overview of Spring What is spring Spring is a lightweight open source framework for layered Java SE/EE applications, IoC (Inverse Of Control) and AOP (aspect oriented programming: Aspect Oriented Programming) as the kernel, it provides many enterprise application technologies such as presentation layer spring MVC, persistence layer Spring ...

Let's give a small example to illustrate what is control inversion IOC? In the initial stage, we write code as follows: Create a new UserDao and its implementation class public interface UserDao { void save(); } public class UserDaoImpl implements UserDao { public void save() { System.out.println("UserDao.save"); } } ...

1. What is circular dependency 1.1 Overview Circular dependency is the interdependence between different objects. For example, A-like constructors depend on B instances, B-like constructors depend on A instances, so Spring needs to inject B instances when initializing A instances, then B instances need to be taken from containers, then B inst ...