我正在尝试创建 restful api，但我的控制器无法正常工作，并且出现如下所示的错误：
{
"timestamp": "2020-06-11T15:28:18.103+00:00",
"status": 404,
"error": "Not Found",
"message": "",
"path": "/path/findCarsAfterYear/2020"
}
请帮助我解决这个问题。
实体类
package com.example.demo.data;
import javax.persistence.*;
@Entity
public class Car {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column
private long id;
@Column
private String model;
@Column
private Integer year;
// standard getters and setters
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public Integer getYear() {
return year;
}
public void setYear(Integer year) {
this.year = year;
}
}
存储库类
package com.example.demo.Repository;
import com.example.demo.data.Car;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.jpa.repository.query.Procedure;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface CarRepository extends JpaRepository<Car, Integer> {
@Query("Select wds from Car wds where year=?1 ")
List<Car> findCarsAfterYear(Integer year);
}
服务类
package com.example.demo.service;
import com.example.demo.Repository.CarRepository;
import com.example.demo.data.Car;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Service
public class CarService {
@Autowired
CarRepository carRepository;
public List<Car> findCarsAfterYear(Integer id) {
return carRepository.findCarsAfterYear(id);
}
}
控制器类
package com.example.demo.Controller;
import com.example.demo.data.Car;
import com.example.demo.service.CarService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@Controller
@RequestMapping(path="/test")
public class CarController {
@Autowired(required=true)
private CarService carService;
@GetMapping(value="/findCarsAfterYear/{id}")
public List<Car> findCarsAfterYear(Integer id) {
return carService.findCarsAfterYear(id);
}
}
应用类
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@Configuration
@SpringBootApplication(exclude = {SecurityAutoConfiguration.class})
@EnableJpaRepositories("com.example.demo.Repository")
@EntityScan("com.example.demo.data")
@ComponentScan(basePackages="com.example.demo.service,com.example.demo.Controller")
@EnableCaching
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
如果你想使用@Controller，你必须明确地提供@ResponseBody。
@Controller
@RequestMapping(path="/test")
public class CarController {
@Autowired(required=true)
private CarService carService;
@GetMapping(value="/findCarsAfterYear/{id}")
@ResponseBody
public List<Car> findCarsAfterYear(Integer id) {
return carService.findCarsAfterYear(id);
}
}
但万一@RestController，这是@Controller和@ResponseBody的组合
@RestController
@RequestMapping(path="/test")
public class CarController {
@Autowired(required=true)
private CarService carService;
@GetMapping(value="/findCarsAfterYear/{id}")
public List<Car> findCarsAfterYear(Integer id) {
return carService.findCarsAfterYear(id);
}
}
我希望这会有所帮助。