Use SpringBoot and SpringMVC to build an efficient JavaWeb application system

SpringBoot and SpringMVC: Building efficient JavaWeb applications requires specific code examples

Introduction:
In today's Internet era, JavaWeb applications are the developer The most commonly used development method. As two very important frameworks in JavaWeb development, SpringBoot and SpringMVC provide developers with an efficient and simplified development method. This article will introduce the concepts and features of SpringBoot and SpringMVC, and provide some specific code examples to help readers better understand and apply these two frameworks.

1. What is SpringBoot and SpringMVC:

1. SpringBoot:
   SpringBoot is a rapid development framework derived from the Spring framework. Its goal is to simplify Spring applications The process of building and configuring the program. SpringBoot provides automatic configuration and launcher functions to quickly build independent, production-level applications.
2. SpringMVC:
   SpringMVC is part of the Spring framework and is an MVC (Model-View-Controller) framework for building web applications. It is based on the MVC design pattern and provides a more flexible and maintainable development method by separating business logic, data model and user interface.

2. Characteristics of SpringBoot and SpringMVC:

1. Features of SpringBoot:
2. Simplified configuration: SpringBoot provides automatic configuration function, which can be configured according to the application Different components are automatically configured according to the program's needs, reducing the developer's configuration work.
3. Embedded server: SpringBoot integrates a variety of commonly used web servers (such as Tomcat, Jetty), which can be run directly as independent applications without additional installation and configuration of the server environment.
4. Simplify dependency management: SpringBoot uses Maven or Gradle for dependency management. By using the SpringBoot starter (Starter), you can introduce all versions of dependencies at once, avoiding dependency conflicts and version inconsistencies.
5. Features of SpringMVC:
6. Flexible URL mapping: SpringMVC maps URLs to methods in the Controller through annotations (such as @RequestMapping) to facilitate the processing of different requests.
7. Powerful data binding and verification: SpringMVC provides a powerful data binding mechanism that can automatically bind request parameters to the parameters of the Controller method, simplifying the data processing process. At the same time, SpringMVC also provides a verification framework that can verify and process input data.
8. Easy to test: The various components of SpringMVC (such as Controller, Service) use normal Java classes to interact, which facilitates the writing and execution of unit tests and integration tests.

3. SpringBoot and SpringMVC code examples:

1. SpringBoot examples:
   (1) Create a SpringBoot project:
   Create a new one in the IDE Maven project, add the following dependencies:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

(2) Write a simple Controller:

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello, SpringBoot!";
    }
}

(3) Start the application:
Write an entry class and add @SpringBootApplication Notes:

@SpringBootApplication
public class Application {

    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }
}

(4) Access interface:
After starting the application, access http://localhost:8080/hello## in the browser #, you will see the returned string Hello, SpringBoot!.

SpringMVC example:
2. (1) Create a Maven project and add the following dependencies:
   

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

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@Controller
public class HelloController {

    @GetMapping("/hello")
    public String hello(Model model) {
        model.addAttribute("message", "Hello, SpringMVC!");
        return "hello";
    }
}

src/main/webapp/WEB-INF/views/hello.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <title>Hello</title>
</head>
<body>
    <h1>${message}</h1>
</body>
</html>

Add the following configuration in
src/main/resources/application.properties:

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

Write an entry class and add
@SpringBootApplication Notes:

@SpringBootApplication
public class Application {

    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }
}

After starting the application, visit
http://localhost:8080/hello in the browser , you will see the string Hello, SpringMVC! displayed on the page.

Through the introduction and code examples of this article, we have learned about the concepts and characteristics of SpringBoot and SpringMVC, and how to use them to build efficient JavaWeb applications. The simplified configuration, embedded server, flexible URL mapping and other features of SpringBoot and SpringMVC make it easier for us to develop and deploy web applications. I hope this article can be helpful to readers in their practice of JavaWeb development.

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