what is spring-boot-starter-web

Spring Boot is a popular Java framework for developing web applications. "spring-boot-starter-web" is a starter package in Spring Boot that provides everything you need to develop a web application using Spring MVC (Model-View-Controller) architecture. It includes the necessary dependencies and configurations to create a web application, such as an embedded Tomcat server, Spring MVC, Spring Web, Spring Boot auto-configuration, and others. With "spring-boot-starter-web", developers can quickly set up a web application using Spring Boot, without having to manually configure everything from scratch.

相关问题

Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.7.15 from/to central

Could you please provide more information? It seems like you are facing an issue while transferring the artifact 'org.springframework.boot:spring-boot-starter-parent:pom:2.7.15' from or to the 'central' repository. Can you clarify what exactly is the problem you are encountering?

mybatis-plus-boot-starter3.5.1 xml

### MyBatis-Plus Boot Starter 3.5.1 XML Configuration Example

For integrating `mybatis-plus-boot-starter` version 3.5.1 within a Spring Boot project, the primary configurations are typically handled through YAML or properties files rather than traditional XML configurations. However, when it comes to defining SQL mappings and customizing certain behaviors of MyBatis-Plus, XML can still play an important role.

#### Application Properties via YAML

Before diving into XML specifics, configuring basic data source settings is essential using YAML:

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost/demo?useUnicode=true&characterEncoding=utf8
    driver-class-name: com.mysql.cj.jdbc.Driver
  mybatis-plus:
    configuration:
      log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    global-config:
      db-config:
        logic-delete-value: 1
        logic-not-delete-value: 0

This setup ensures that the database connection details along with logging and logical deletion features are properly configured[^3].

#### Mapper XML Files

Mapper XML files serve as templates where actual SQL queries reside. An example of such a file might look like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.UserMapper">

  <!-- Select all users -->
  <select id="selectAllUsers" resultType="com.example.demo.entity.User">
    SELECT * FROM user;
  </select>

</mapper>

Each `<mapper>` element corresponds to one interface (or DAO), which contains various CRUD operations defined either by annotations directly on methods inside interfaces or explicitly written out here in XML format[^2].

#### Integrating Mappers Within Spring Boot

To ensure these mappers get picked up automatically during application startup without needing explicit bean definitions for each individual mapper class, adding specific package scan paths becomes necessary. This action usually takes place within the main application class annotated with `@SpringBootApplication`.

@SpringBootApplication
@MapperScan("com.example.demo.mapper") // Specify your own path accordingly.
public class DemoApplication {
    
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

By specifying the base packages containing mapper interfaces, Spring will register them appropriately at runtime, allowing seamless interaction between Java code and underlying relational databases facilitated by MyBatis-Plus[^1].

--related questions--

1. How does one configure multiple datasources while working with MyBatis Plus?
2. What steps should be taken to enable debug-level logging specifically for MyBatis Plus SQL statements?
3. Can you provide guidance on implementing pagination support effectively using MyBatis Plus?
4. In what ways do MyBatis Plus interceptors enhance query performance optimization?
5. Is there any difference in setting up MyBatis Plus under different versions of Spring Boot applications?