Hello! Today, we will conduct an in-depth course on backend development using Spring Boot. Spring Boot is a Java-based framework that provides a platform for developing web applications quickly and easily. This course focuses on Spring Boot 3<\/strong> and the latest version of Java<\/strong>.<\/p>\n Spring Boot is an extension of the Spring Framework. The Spring Framework is a powerful development tool for applications developed in Java, but its configuration and initialization can be complex. Spring Boot was created to address these issues and provides the following key features:<\/p>\n Spring Boot 3 is based on Spring Framework 6 and includes several new features and improvements. Key changes include:<\/p>\n To develop with Spring Boot, you need to set up your development environment. Please follow the steps below.<\/p>\n The JDK is a Java development tool; download and install the latest version. After installation, set the PATH environment variable.<\/p>\n IntelliJ IDEA is recommended due to its good integration with Spring Boot. Add the required plugins after installation.<\/p>\n Choose one to install. If using Maven, manage dependencies through There are various ways to create a Spring Boot project. Here, we will introduce a method using Spring Initializr.<\/p>\n Now, let’s create a simple RESTful API using Spring Boot. The following example is a user management API.<\/p>\n Now when you run the application, you can check the user list at Spring Boot can integrate with various databases. You can use several databases like H2, MySQL, PostgreSQL, etc. Here, we will use H2.<\/p>\n As projects grow, writing API documentation becomes essential. You can easily write API documentation using Swagger.<\/p>\n After running the application, you can check the API documentation through Swagger UI at Below is an example of writing test cases using Spring Boot. We will use JUnit and Spring Test to do this.<\/p>\n In this course, we explored how to create a simple backend application using Spring Boot. Thanks to its various features and easy configuration, Spring Boot is a useful tool for quickly developing web applications. For deeper learning, please refer to the official Spring Boot documentation<\/a>.<\/p>\n Thank you!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"1. What is Spring Boot?<\/h2>\n
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2. Key Changes in Spring Boot 3<\/h2>\n
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3. Setting Up the Development Environment<\/h2>\n
1. Install JDK: Install OpenJDK 17 or higher.\n2. Install an IDE: Choose and install an IDE such as IntelliJ IDEA or Eclipse.\n3. Install Maven or Gradle: Use Maven or Gradle to manage dependencies.<\/code><\/pre>\n3.1 Install JDK<\/h3>\n
3.2 Install IDE<\/h3>\n
3.3 Install Maven or Gradle<\/h3>\n
pom.xml<\/code>. If using Gradle, use the build.gradle<\/code> file.<\/p>\n4. Creating a Spring Boot Project<\/h2>\n
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com.example<\/code><\/li>\ndemo<\/code><\/li>\n5. Creating a Simple RESTful API<\/h2>\n
5.1 Add Dependency<\/h3>\n
<dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-web<\/artifactId>\n<\/dependency><\/code><\/pre>\n5.2 Create Model Class<\/h3>\n
package com.example.demo.model;\n\npublic class User {\n private Long id;\n private String name;\n \n \/\/ Constructor, Getter, and Setter methods\n}<\/code><\/pre>\n5.3 Create Controller Class<\/h3>\n
package com.example.demo.controller;\n\nimport org.springframework.web.bind.annotation.*;\nimport com.example.demo.model.User;\n\nimport java.util.ArrayList;\nimport java.util.List;\n\n@RestController\n@RequestMapping(\"\/api\/users\")\npublic class UserController {\n private List5.4 Run the Application<\/h3>\n
http:\/\/localhost:8080\/api\/users<\/code>.<\/p>\n6. Integrating with a Database<\/h2>\n
6.1 Add H2 Database Dependency<\/h3>\n
<dependency>\n <groupId>com.h2database<\/groupId>\n <artifactId>h2<\/artifactId>\n <scope>runtime<\/scope>\n<\/dependency><\/code><\/pre>\n6.2 Configure application.properties<\/h3>\n
spring.datasource.url=jdbc:h2:mem:testdb\nspring.datasource.driverClassName=org.h2.Driver\nspring.datasource.username=sa\nspring.datasource.password=\nspring.h2.console.enabled=true<\/code><\/pre>\n7. Writing API Documentation<\/h2>\n
7.1 Add Swagger Dependency<\/h3>\n
<dependency>\n <groupId>io.springfox<\/groupId>\n <artifactId>springfox-boot-starter<\/artifactId>\n <version>3.0.0<\/version>\n<\/dependency><\/code><\/pre>\n7.2 Create Swagger Configuration Class<\/h3>\n
package com.example.demo.config;\n\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport springfox.documentation.builders.PathSelectors;\nimport springfox.documentation.builders.RequestHandlerSelectors;\nimport springfox.documentation.spi.DocumentationType;\nimport springfox.documentation.spring.web.plugins.Docket;\nimport springfox.documentation.swagger2.annotations.EnableSwagger2;\n\n@Configuration\n@EnableSwagger2\npublic class SwaggerConfig {\n @Bean\n public Docket api() {\n return new Docket(DocumentationType.SWAGGER_2)\n .select()\n .apis(RequestHandlerSelectors.any())\n .paths(PathSelectors.any())\n .build();\n }\n}<\/code><\/pre>\n7.3 Using Swagger UI<\/h3>\n
http:\/\/localhost:8080\/swagger-ui\/<\/code>.<\/p>\n8. Writing Test Cases<\/h2>\n
8.1 Add Dependency<\/h3>\n
<dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-test<\/artifactId>\n <scope>test<\/scope>\n<\/dependency><\/code><\/pre>\n8.2 Create Test Class<\/h3>\n
package com.example.demo;\n\nimport static org.assertj.core.api.Assertions.assertThat;\n\nimport org.junit.jupiter.api.Test;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;\nimport org.springframework.boot.test.context.SpringBootTest;\nimport org.springframework.test.web.servlet.MockMvc;\n\n@SpringBootTest\n@AutoConfigureMockMvc\npublic class UserControllerTests {\n @Autowired\n private MockMvc mockMvc;\n\n @Test\n public void getUsers_ShouldReturnUsers() throws Exception {\n this.mockMvc.perform(get(\"\/api\/users\"))\n .andExpect(status().isOk())\n .andExpect(jsonPath(\"$.length()\").value(0));\n }\n}<\/code><\/pre>\n9. Conclusion<\/h2>\n