src\/main\/resources\/application.properties<\/code> file:<\/p>\n\nspring.datasource.url=jdbc:h2:mem:testdb\nspring.datasource.driverClassName=org.h2.Driver\nspring.datasource.username=sa\nspring.datasource.password=\nspring.h2.console.enabled=true\n<\/pre>\n4.2 Creating the Entity Class<\/h3>\n
Now let’s create the Entity class that will be mapped to the database. Create a “model” package, and write the User<\/code> class as follows:<\/p>\n\npackage com.example.demo.model;\n\nimport javax.persistence.Entity;\nimport javax.persistence.GeneratedValue;\nimport javax.persistence.GenerationType;\nimport javax.persistence.Id;\n\n@Entity\npublic class User {\n @Id\n @GeneratedValue(strategy = GenerationType.IDENTITY)\n private Long id;\n private String name;\n private String email;\n\n \/\/ Getters and Setters\n}\n<\/pre>\n4.3 Creating the Repository Interface<\/h3>\n
To interact with the database using Spring Data JPA, create a Repository interface. Create a ‘repository’ package and write the interface as follows:<\/p>\n
\npackage com.example.demo.repository;\n\nimport com.example.demo.model.User;\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface UserRepository extends JpaRepository {\n}\n<\/pre>\n4.4 Creating the Service Class<\/h3>\n
Create a Service class to handle business logic. Create a ‘service’ package and write the UserService class as follows:<\/p>\n
\npackage com.example.demo.service;\n\nimport com.example.demo.model.User;\nimport com.example.demo.repository.UserRepository;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\nimport java.util.List;\n\n@Service\npublic class UserService {\n\n @Autowired\n private UserRepository userRepository;\n\n public List findAll() {\n return userRepository.findAll();\n }\n\n public User save(User user) {\n return userRepository.save(user);\n }\n}\n<\/pre>\n4.5 Creating the Controller Class<\/h3>\n
Create a Controller class to handle HTTP requests. Create a ‘controller’ package and write the UserController class as follows:<\/p>\n
\npackage com.example.demo.controller;\n\nimport com.example.demo.model.User;\nimport com.example.demo.service.UserService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.*;\n\nimport java.util.List;\n\n@RestController\n@RequestMapping(\"\/users\")\npublic class UserController {\n\n @Autowired\n private UserService userService;\n\n @GetMapping\n public List getAllUsers() {\n return userService.findAll();\n }\n\n @PostMapping\n public User createUser(@RequestBody User user) {\n return userService.save(user);\n }\n}\n<\/pre>\n5. Understanding RESTful APIs<\/h2>\n
Now let’s understand RESTful APIs using Spring Boot. REST stands for Representational State Transfer and is a web-based architectural style. RESTful APIs operate by creating, reading, modifying, and deleting resources through HTTP requests.<\/p>\n
5.1 HTTP Methods<\/h3>\n
RESTful APIs use the following HTTP methods:<\/p>\n
\n- GET:<\/strong> Retrieve resources<\/li>\n
- POST:<\/strong> Create resources<\/li>\n
- PUT:<\/strong> Modify resources<\/li>\n
- DELETE:<\/strong> Delete resources<\/li>\n<\/ul>\n
5.2 JSON Data<\/h3>\n
JSON (JavaScript Object Notation) format is commonly used to transmit data in RESTful APIs. JSON is a lightweight and human-readable data format widely used in web applications.<\/p>\n
6. Understanding Project Structure Through Diagrams<\/h2>\n
Based on what we have discussed so far, let\u2019s draw the project structure. Here is the overall project structure:<\/p>\n
\ndemo\n\u251c\u2500\u2500 src\n\u2502 \u251c\u2500\u2500 main\n\u2502 \u2502 \u251c\u2500\u2500 java\n\u2502 \u2502 \u2502 \u2514\u2500\u2500 com.example.demo\n\u2502 \u2502 \u2502 \u251c\u2500\u2500 controller\n\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 UserController.java\n\u2502 \u2502 \u2502 \u251c\u2500\u2500 model\n\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 User.java\n\u2502 \u2502 \u2502 \u251c\u2500\u2500 repository\n\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 UserRepository.java\n\u2502 \u2502 \u2502 \u2514\u2500\u2500 service\n\u2502 \u2502 \u2502 \u2514\u2500\u2500 UserService.java\n\u2502 \u2502 \u2514\u2500\u2500 resources\n\u2502 \u2502 \u2514\u2500\u2500 application.properties\n\u2514\u2500\u2500 pom.xml\n<\/pre>\n7. Conclusion<\/h2>\n
In this course, we learned the basics of backend development using Spring Boot and how to implement a simple RESTful API integrated with a database. Spring Boot is a powerful framework, so I encourage you to continue learning and take advantage of its various features.<\/p>\n
Don’t stop here; take on various projects! We wish you success on your development journey!<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
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