Spring MVC series (iii) spring + springMVC integration (annotation Mode)

Spring MVC series (iii) spring + springMVC integration (annotation Mode)

I personally think that it is not very difficult to use the framework. The key is to understand its ideas, which is very helpful for us to improve programming. However, if you don't use it, you can talk about your thoughts on paper !!! First technology, then thinking. Practice.

1. Basic Concepts
1.1. Spring

Spring is an open-source framework. Spring was a lightweight Java development framework that emerged in 2003, it is derived from part of the concepts and prototype stated by Rod Johnson in his book "Expert One-On-One J2EE Development and Design. It is created to solve the complexity of enterprise application development. Spring uses the basic JavaBean to complete the previous tasks that may only be completed by EJB. However, Spring is not only used for server-side development. From the perspective of simplicity, testability, and loose coupling, any Java application can benefit from Spring. In short, Spring is a lightweight container framework for IoC and AOP.

1.2 SpringMVC

Spring MVC is a follow-up product of SpringFrameWork and has been integrated into Spring Web Flow. Spring MVC separates the roles of controllers, model objects, schedulers, and processing program objects, making them easier to customize.

2. Environment setup

2.1 introduce the corresponding package

The structure of springMVC and spring packages has undergone great changes. Each package is separated and flexible, requiring users to learn more deeply. When we introduce the package, based on the principle of "less", you can find the corresponding package based on the error. If there are too many packages, the packet will report errors and exceptions, which are difficult to distinguish. sprinMVC and spring are one of them, therefore, the introduced packages are basically the same as the architecture packages required by spring.

2.2 New Annotation xml file: springAnnotation-servlet.xml

2.3 create springxml file springAnnotation-core.xml

Interface implementation class to be called through bean Injection

2.3.1 ISpring Interface

public interface ISpring {    public String get();}

2.3.2 ISpring implementation class

Public class SpringManager implements ISpring {@ Overridepublic String get () {// determines whether System is called. out. println ("------ I am springManager ----"); return "I am getMethod ";}}

2.3.3 SpringController class

Public class SpringController {// This replaces the process of configuring attributes in xml @ Resource (name = "springManager") private ISpring springManager; // inject springManager @ RequestMapping ("/spring/get") public String get () {System. out. println (springManager. get (); return "/success ";}}

The global configuration point of a project is in web. xml. You can view the framework used by a project in xml.

 
   
  
   
SpringMVC8
    
      
   
    
Index.html
       
   
    
Index.htm
       
   
    
Index. jsp
       
   
    
Default.html
       
   
    
Default.htm
       
   
    
Default. jsp
     
      
    
   
    
ContextConfigLocation
     
   
    
Classpath *: config/springAnnotation-core.xml
     
     
    
    
     
   
    
Org. springframework. web. context. ContextLoaderListener
     
    
    
    
   
    
SpringMVC
     
   
    
Org. springframework. web. servlet. DispatcherServlet
     
     
    
     
ContextConfigLocation
      
       
    
     
Classpath *: config/springAnnotation-servlet.xml
       
     
   
    
1
     
     
  
   
    
EncodingFilter
   
   
    
Org. springframework. web. filter. CharacterEncodingFilter
   
   
    
     
Encoding
    
    
     
UTF-8
    
   
   
    
     
ForceEncoding
    
    
     
True
    
   
  
  
  
   
    
EncodingFilter
   
   
    
/*
   
        
    
   
    
SpringMVC
     
   
    
/
     
  
 

Annotation: springMVC listens through dispastservlet. spring listens through linstener. The starting sequence between them is that the web Container has another one,

First, context-param

Second: Listerer

Third: Filter

Fourth: servlet

There is a certain relationship between the startup sequence.

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Summary

A picture is better than a thousand words!

Next , Please look forward to learning!