1.Exception処理

2.テスト項目

01.Errorの作成

package com.example.exception.dto;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class User {

    @NotEmpty
    @Size(min = 1, max = 10)
    private String name;

    @Min(1)
    @NotNull
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

package com.example.exception.controller;

import com.example.exception.dto.User;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

@RestController
@RequestMapping("/api")
public class RestApiController {

    @GetMapping("/user")
    public String get(@RequestParam(required = false) String name, @RequestParam(required = false) Integer age) {
        User user = new User();
        user.setName(name);
        user.setAge(age);

        int a = 10 + age;

        return user.toString();
    }

    @PostMapping("/user")
    public User post(@Valid @RequestBody User user) {
        return user;
    }
}

02.エラー処理

-1.グローバルコンサルティングの応用

1.完全異常処理

package com.example.exception.advice;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class GlobalControllerAdvice {

    // value = 내가 잡을 예외
    @ExceptionHandler(value = Exception.class)
    public ResponseEntity exception(Exception e) {
        System.out.println("------------------------------");
        System.out.println(e.getLocalizedMessage());
        System.out.println("------------------------------");

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("");
    }
}

-2.特定異常の処理

package com.example.exception.advice;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

// (basePackages = "com. ...")로 예외처리할 패키지 지정 가능
@RestControllerAdvice()
public class GlobalControllerAdvice {

    // value = 내가 잡을 예외
    @ExceptionHandler(value = Exception.class)
    public ResponseEntity exception(Exception e) {
        System.out.println(e.getClass());
        System.out.println("------------------------------");
        System.out.println(e.getLocalizedMessage());
        System.out.println("------------------------------");

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("");
    }

    // 특정 메소드의 예외 처리
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public ResponseEntity methodArgumentNotValidException(MethodArgumentNotValidException e) {

        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(e.getMessage());
    }
}

-3.特定コントローラ内でのみ異常処理方法を使用

package com.example.exception.controller;

import com.example.exception.dto.User;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

@RestController
@RequestMapping("/api")
public class RestApiController {

    @GetMapping("/user")
    public String get(@RequestParam(required = false) String name, @RequestParam(required = false) Integer age) {
        User user = new User();
        user.setName(name);
        user.setAge(age);

        int a = 10 + age;

        return user.toString();
    }

    @PostMapping("/user")
    public User post(@Valid @RequestBody User user) {
        return user;
    }

    // 특정 메소드의 예외 처리
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public ResponseEntity methodArgumentNotValidException(MethodArgumentNotValidException e) {
        System.out.println("rest api conroller");
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(e.getMessage());
    }
}