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This article mainly explains the "Java SpringBoot multi-module development", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "Java SpringBoot multi-module development" bar!

In Javaweb project development, in order to facilitate later maintenance, we generally carry out hierarchical development, which is commonly divided into model (domain model layer), dao (database access layer), service (business logic layer), controller (controller layer) and web (presentation layer). After layering, the responsibilities between each layer will be relatively clear, and it will be relatively easy to maintain later.

Previously, we developed all in one module, distinguishing different layers by packages, as follows:

1. Create a SpringBoot project

The structure is:

The codes are:

Public class User {

Private String username

Private String password

Private String realname

... Omit the get\ set construction method

}

@ Repository

Public class UserDAO {

Public List

Return Arrays.asList (new User ("zhangsan", "111"," Zhang San ")

New User ("lisi", "111"," Li Si ")

New User ("wangwu", "111"," Wang Wu "))

}

}

@ Service

Public class UserService {

@ Resource

Private UserDAO userDAO

Public List

Return userDAO.selectAllUsers ()

}

}

@ Controller

@ RequestMapping ("/ user")

Public class UserController {

@ Resource

Private UserService userService

@ RequestMapping ("/ list")

@ ResponseBody

Public String list () {

List

StringBuilder stringBuilder = new StringBuilder ()

For (User user: allUsers) {

StringBuilder.append ("

Name: ")

StringBuilder.append (user.getRealname ())

StringBuilder.append ("

")

}

Return stringBuilder.toString ()

}

}

@ SpringBootApplication

Public class DemoApplication {

Public static void main (String [] args) {

SpringApplication.run (DemoApplication.class, args)

}

}

Start the project, test

Multi-module development:

As the project becomes more and more complex, the scale of each layer increases gradually. developing in one module will bring inconvenience to testing and maintenance. for large projects, each layer is generally put into its own module, and then each layer is connected and maintained separately.

Next, we will ReFactor the previous single-module project into a multi-module project:

The game project is divided into four modules.

Controller

Service

Dao

Model

The dependency between modules is

Controller relies on service and model

Service relies on dao and model

Dao depends on model

Refactoring a multi-module project

1. First select the pom.xml of the project, and change the packaging method to pom.

2. Create a model module:

Right click the project-- > New-- > Module-- > Select maven-- > Next

Enter the module name model-- > Next-- > Finish

This is how the module is created.

Then copy the whole package of model in the original project to the java directory of the model module:

3. Create a new dao module, and the process is similar to that before.

After the new project is completed, the code will report an error because the User class cannot be found because the dao module has not yet added the dependency of the model module

Add dependencies in the pom.xml of the dao module

4. Add service module

Add dependencies:

5. Add controller module

Add dependencies: then copy the DemoApplication class of the original project to the base package under the java directory of the controller module, in this case com.qianfeng.springboot

6. Click Build Project to compile the project, and then start the program for testing. If you can start successfully and see the original execution effect, then the multi-module refactoring of the project will be completed.

Thank you for your reading, the above is the content of "Java SpringBoot multi-module development". After the study of this article, I believe you have a deeper understanding of how to develop Java SpringBoot multi-module, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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