Convention over Configuration, also known as programming by convention, is a software design paradigm
Essentially, the system, class library, or framework should assume reasonabledefault value, rather than requiring unnecessary configurations.
For example, if there is a User class in the model, then there will be a corresponding table in the database named User by default, and you will only need to write configurations for this name if you deviate from this convention.
For example, usually architects to build the project is to limit the software development of random code, to develop a set of specifications, so that the developers according to the unified requirements for the development of coding and testing and so on, which strengthens the efficiency of development and review of code efficiency. So that when you write the code needs to be named according to the requirements, so that a unified code will have a good readability and maintainability.
The essence of convention over allocation is thatFollow conventions and use as little configuration as possible
Spring Pros and Cons
vantage
Spring is a lightweight replacement for Java Enterprise Edition (Java Enterprise Edition, JEE, also known as J2EE). No need to develop heavyweight Enterprise Java Bean (EJB), Spring for enterprise Java development provides a relatively simple method through dependency injection and cut-oriented programming , with simple Java objects (Plain Old Java Object, POJO) to achieve the EJB function
drawbacks
Spring's component code is lightweight, but its configuration is heavyweightSpring 2.5 introduced annotation-based component scanning. But in the beginning, Spring required the use of XML configuration, and a lot of it.Spring 2.5 introduced annotation-based component scanning, which eliminated a lot of explicit XML configuration for the application's own components.Spring 3.0 introduced Java-based configuration, a type-safe, reconfigurable way to configure components instead of XML.
All of these configurations represent wear and tear during development. Because of the mind-switch between thinking about Spring feature configuration and solving a business problem, writing configurations takes time away from writing application logic. Like all frameworks, Spring is useful, but it also demands a lot in return.
Beyond that.Project dependency management can also be time-consuming and labor-intensiveWhen setting up the environment, you need to analyze which libraries you want to import. When setting up the environment, it is necessary to analyze which libraries' coordinates are to be imported, and it is also necessary to analyze the coordinates of other libraries that have dependencies on them. If the wrong version of the dependency is chosen, the ensuing incompatibility problems will seriously hinder the development progress of the project.
SSM Integration:Spring, SpringMVC, Mybatis, Spring-Mybatis integration package,database driverThe first is that it introduces a large number of dependencies and is prone to version conflicts.
SpringBoot to solve spring problems
SpringBoot on the above Spring's shortcomings to improve and optimize, based on the idea that the agreement is better than the configuration, you can let the developer does not have to configure the logic of the business between the thinking of switching to the logic of the business code writing, thus greatly improving the efficiency of the development of a certain degree to shorten the project cycle!
initial reliance
Starting dependency is essentially aMavenThe Project Object Model (POM), which defines pass-through dependencies on other libraries that add up to support a feature.
Simply put, starting a dependency is packaging together dependency coordinates that have some functionality and provide some default functionality.
auto-configuration
Springboot's autoconfiguration refers to the fact that springboot, automatically registers some configuration class beans into the ioc container, and we can use it where we need it using annotations such as @autowired or @resource.
The "automatic" form of expression is that we only need to quote the package we want to use the function, we do not have to care about the related configuration, springboot will automatically inject these configuration beans, we can directly use these beans
springboot: simple, fast , easy to build projects ; no configuration of the mainstream development framework integration ; greatly improve the development, deployment efficiency
SpringBoot Getting Started Tutorial
Requirement: request a method in the Controller and respond with the return value to the page
Creating a SpringBoot Project
Building a Spring Boot project using the Spring Initializr approach
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Project SDK" is used to set up the creation of the project to use the version of the JDK, the project to use the previous initialization of the JDK version can be set up; in the "Choose Initializr Service URL (select the initialization service address)" under the use of the Default initialization service address"” Perform Spring Boot project creation (note that the host must be online when using the fast way to create a Spring Boot project).
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If you use a quick build of the Default way to create a SpringBoot project, you must use the network, the so-called quick build is the essence of the development tool to implement the parameters, the URL provided by Spring corresponding to the server to generate, Idea to speak of the server-generated SpringBoot project to download to the local space!
SpringBoot project structure analysis
Dependency management
4.0.0
spring-boot-starter-parent
2.6.1
springboot_demo
0.0.1-SNAPSHOT
springboot_demo
Demo project for Spring Boot
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spring-boot-starter
spring-boot-starter-web
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