Programmer Help

01-What is Spring? Spring is a lightweight framework, and you will have a lot of unknown terms after Baidu, but these are not important. It is important to understand what changes Spring can make to your daily development, that is 02-What does Spring do? Spring is used to manage objects for us. The change Spring brings to us is that we don't ...

1. Background In the course of your work, you sometimes need to perform different logic based on different enumerations (constants). For example, different user types have different methods of handling, the interface is Handler, and the sample code is as follows: public interface Handler { void someThing(); } Some students choose to ...

XML load parsing 1. Load Bean definition 1.1 parsing XML documents XmlBeanDefinitionReader#loadBeanDefinitions /** * Load xml resources, parse all xml tags, encapsulate the bean corresponding to xml as beandefinition (the real type is GenericBeanDefinition), and register * Returns the number of loaded beandefinitions */ public int loadBeanDe ...

IoC What is IoC? IoC is the abbreviation of inversion of control. Note that it is a technical idea. It describes the creation and management of objects. Traditional development methods: for example, if class a depends on class B, it often creates a new object of class B in class A. IoC development method: we don't need to go to the new obj ...

1, Foreword As the most popular Java web development scaffold, Spring Boot is used by more and more developers to build enterprise RESTFul API interfaces. These interfaces will serve not only the traditional web side (b/s), but also the mobile side. In the actual development process, these interfaces should also be provided to the development ...

Spring 1. Spring overview Spring is an IOC(DI) and AOP container framework 2. Excellent features of Spring (1) Non intrusive (2) Control reversal: IOC (3) Dependency injection: DI (4) Aspect oriented: AOP extends its functions without modifying the source code (5) Container: it contains and manages the declaration cycle of application o ...

Program example (one person has two pets) Cat class package com.jing.pojo; public class Cat { public void shout(){ System.out.println("Meow"); } } Dog class package com.jing.pojo; public class Dog { public void shout(){ System.out.println("Woof"); } } Person class public class Person { private Cat cat ...

1,BeanDefinition BeanDefinition represents a Bean definition. There are many attributes in BeanDefinition to describe the characteristics of a Bean. For example: class: indicates the Bean typeScope: indicates the Bean scope, singleton or prototypelazyInit: indicates whether the Bean is lazy loadedinitMethodName: indicates the method to be exe ...

Principle of boot loading configuration class SpringBoot is started through @ SpringBootApplication. In the previous chapter, we found that after startup, in addition to the components we added to the IOC container, other components were automatically added to the IOC container. We guess they were added through this annotation. Let's take a lo ...

When we annotate the class @ Controller and annotate the method @ RequestMapping in actual development, how does he know the corresponding method when requesting. Before the introduction, first understand how to load the mapped Lu Jin when spring starts. In Spring MVC, there is an interface HandlerMapping that deals with request mapping, Handl ...