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spring-boot - 为 spring 启动代码添加自定义异常的最佳方法

转载 作者:行者123 更新时间:2023-12-03 07:38:41 28 4
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发生异常时如何显示相应的错误信息。

假设在 GET 方法期间,如果未找到数据,则应显示自定义异常消息。

同样,如果我们试图删除不可用的数据。

Car.java

package com.car_rental_project.car_project;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity

public class Car {

@Id
private String id;
private String modelname;
private String type;
private String year_of_registration;
private String seating_capacity;
private String cost_per_day;
private String milleage;
private String pincode;
private String contact_number;
private String email;

public Car() {

}

public Car(String id, String modelname, String type, String year_of_registration, String seating_capacity,String cost_per_day, String milleage, String pincode, String contact_number, String email) {
super();
this.id = id;
this.modelname = modelname;
this.type = type;
this.year_of_registration = year_of_registration;
this.seating_capacity = seating_capacity;
this.cost_per_day = cost_per_day;
this.milleage = milleage;
this.pincode = pincode;
this.contact_number = contact_number;
this.email = email;
}

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getModelname() {
return modelname;
}

public void setModelname(String modelname) {
this.modelname = modelname;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}

public String getYear_of_registration() {
return year_of_registration;
}

public void setYear_of_registration(String year_of_registration) {
this.year_of_registration = year_of_registration;
}

public String getSeating_capacity() {
return seating_capacity;
}

public void setSeating_capacity(String seating_capacity) {
this.seating_capacity = seating_capacity;
}

public String getCost_per_day() {
return cost_per_day;
}

public void setCost_per_day(String cost_per_day) {
this.cost_per_day = cost_per_day;
}

public String getMilleage() {
return milleage;
}

public void setMilleage(String milleage) {
this.milleage = milleage;
}

public String getPincode() {
return pincode;
}

public void setPincode(String pincode) {
this.pincode = pincode;
}

public String getContact_number() {
return contact_number;
}

public void setContact_number(String contact_number) {
this.contact_number = contact_number;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}
}

CarService.java
package com.car_rental_project.car_project;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CarService {

@Autowired
private CarRepository CarRepository;

public List<Car> getAllCars() {
return (List<Car>) CarRepository.findAll();
}

public Car getCar(String id) {
return (Car) CarRepository.findOne(id);

}

public void addCar(Car car) {
this.CarRepository.save(car);
}

public void updateCar(String id, Car car) {
this.CarRepository.save(car);
}

public void deleteCar(String id) {
this.CarRepository.delete(id);;
}
}

CarController.java
package com.car_rental_project.car_project;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CarController {

@Autowired
private CarService carService;

@RequestMapping("/car")
public List<Car> getAllCars() {
return carService.getAllCars();
}

@RequestMapping("/car/{id}")
public Car getCar(@PathVariable String id) {
return carService.getCar(id);
}

//@PostMapping("/car")
@RequestMapping(method=RequestMethod.POST, value="/car")
public String addCar(@RequestBody Car car) {
carService.addCar(car);
String response = "{\"success\": true, \"message\": Car has been added successfully.}";
return response;
}

//@RequestMapping(method=RequestMethod.PUT, value="/car/{id}")
@PutMapping("/car/{id}")
public String updateCar(@RequestBody Car car, @PathVariable String id) {
carService.updateCar(id, car);
String response = "{\"success\": true, \"message\": Car has been updated successfully.}";
return response;
}

//@RequestMapping(method=RequestMethod.DELETE, value="/topics/{id}")
@DeleteMapping("/car/{id}")
public String deleteCar(@PathVariable String id) {
carService.deleteCar(id);
String response = "{\"success\": true, \"message\": Car has been deleted successfully.}";
return response;
}
}

最佳答案

以下是您可以遵循的一些方法来处理您的自定义异常。

创建一个 POJO 来处理您的自定义错误消息并放置您想要返回的属性。

public class ErrorResponse {
private String message;

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}
}

方法 1. 在您的 Controller 方法中。
    @RequestMapping("/car/{id}")
public ResponseEntity<?> getCar(@PathVariable String id) {
Car car = carService.getCar(id);
if (car == null) {
ErrorResponse errorResponse = new ErrorResponse();
errorResponse.setMessage("Record not found");
return new ResponseEntity<>(errorResponse, HttpStatus.NOT_FOUND)
}
return new ResponseEntity<>(car, HttpStatus.OK);
}

方法 2:全局处理异常。

步骤 1:创建 NotFound 异常类并扩展到 RunTime Exception。
public class NoRecordFoundException extends RuntimeException {

public NoRecordFoundException() {
super();
}
}

步骤 2:创建全局异常处理程序
@RestControllerAdvice
public class GlobalExceptionHandler {

@ExceptionHandler(NoRecordFoundException.class)
@ResponseStatus(HttpStatus.NOT_FOUND)
@ResponseBody
public ErrorResponse handleNoRecordFoundException(NoRecordFoundException ex)
{

ErrorResponse errorResponse = new ErrorResponse();
errorResponse.setMessage("No Record Found");
return errorResponse;
}

//同样你可以处理内部的Exceptionerror
@ExceptionHandler(Exception.class)
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
@ResponseBody
public ErrorResponse handleDefaultException(Exception ex) {
ErrorResponse response = new ErrorResponse();
response.setMessage(ex.getMessage());
return response;
}
}

第 3 步:从您的 Controller 或服务中抛出 Not found 异常:
        @RequestMapping("/car/{id}")
public ResponseEntity<?> getCar(@PathVariable String id) {
Car car = carService.getCar(id);
if (car == null) {
throw new NoRecordFoundException();
}
return new ResponseEntity<>(car, HttpStatus.OK);
}

方法 3:在 Controller 中创建 @ExceptionHandler 并抛出
 @ExceptionHandler(NoRecordFoundException.class)
@ResponseStatus(HttpStatus.NOT_FOUND)
@ResponseBody
public ErrorResponse handleNoRecordFoundException(NoRecordFoundException ex) {

ErrorResponse errorResponse = new ErrorResponse();
errorResponse.setMessage("No Record Found");
return errorResponse;
}

关于spring-boot - 为 spring 启动代码添加自定义异常的最佳方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52437023/

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