基于 Cursor 开发 Spring Boot 项目详细攻略

src
├── main
│   ├── java/com/example/demo
│   │   ├── DemoApplication.java       # 启动类
│   │   ├── controller                 # REST 控制器
│   │   ├── service                    # 业务逻辑层
│   │   └── repository                 # 数据访问层
│   └── resources
│       ├── application.properties     # 配置文件
│       └── static                     # 静态资源
└── test                               # 测试代码

import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/api")
public class HelloController {
    @GetMapping("/hello")
    public String hello(@RequestParam(required = false) String name) {
        return "Hello, " + (name != null ? name : "World") + "!";
    }
}

curl http://localhost:8080/api/hello?name=Spring
# 输出：Hello, Spring!

spring.datasource.url=jdbc:h2:mem:testdb
spring.h2.console.enabled=true

import jakarta.persistence.*;
@Entity
public class User {
    @Id
    @GeneratedValue
    private Long id;
    private String name;
    // 构造器/getters/setters
}

import org.springframework.data.jpa.repository.JpaRepository;
public interface UserRepository extends JpaRepository<User, Long> {}

import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserService {
    private final UserRepository repository;
    public UserService(UserRepository repository) {
        this.repository = repository;
    }
    public List<User> getAllUsers() {
        return repository.findAll();
    }
}

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.web.servlet.MockMvc;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
@WebMvcTest(HelloController.class)
class HelloControllerTest {
    @Autowired
    private MockMvc mockMvc;
    @Test
    void helloEndpoint() throws Exception {
        mockMvc.perform(get("/api/hello"))
               .andExpect(status().isOk())
               .andExpect(content().string("Hello, World!"));
    }
}

mvn clean package

java -jar target/demo-0.0.1-SNAPSHOT.jar

FROM eclipse-temurin:17-jdk-alpine
COPY target/*.jar app.jar
ENTRYPOINT ["java","-jar","/app.jar"]