2일차 과제 - api 만들기

 

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자바와 스프링 부트로 생애 최초 서버 만들기, 누구나 쉽게 개발부터 배포까지! [서버 개발 올인

 

문제 1

 

컨트롤러

@RestController //api의 진입지점으로
public class CalculatorController {

    @GetMapping("/api/v1/calc")
        public CalculatorRequest addMinusMultiply(@RequestParam int num1, int num2) {
        return new CalculatorRequest(num1,num2);
    }

 

DTO

public class CalculatorRequest {

    private int add;
    private int minus;
    private int multiply;

    public CalculatorRequest(int num1, int num2) {
        this.add = num1 + num2;
        this.minus = num1 - num2;
        this.multiply = num1 * num2;
    }

    public int getAdd() {
        return add;
    }

    public int getMinus() {
        return minus;
    }

    public int getMultiply() {
        return multiply;
    }
}

 

결과

 

 

문제 2

 

컨트롤러

@RestController
public class DateOfWeekController {

    @GetMapping("/api/v1/day-of-the-week")
    public DayOfWeekResponse getDayOfWeek(@RequestParam("date") String date) {
        LocalDate parsedDate = LocalDate.parse(date);
        DayOfWeek dayOfWeek = parsedDate.getDayOfWeek();
        return new DayOfWeekResponse(dayOfWeek.toString().substring(0,3));
    }
}

 

DTO

public class DayOfWeekResponse {

    private String dayOfWeek;

    public DayOfWeekResponse(String dayOfWeek) {
        this.dayOfWeek = dayOfWeek;
    }

    public String getDayOfWeek() {
        return dayOfWeek;
    }
}

 

결과

 

 

문제 3

컨트롤러

@RestController 
public class CalculatorController {

    @PostMapping("/api/sum")
        public Integer sumNumbers(@RequestBody CalculatorSumRequest request) {
        return request.getSum();
    }
}

 

DTO

package com.group.libraryapp.controller.dto.calculator.request;

import java.util.List;

public class CalculatorSumRequest {

    private List<Integer> numbers;
    private int sum;

    public List<Integer> getNumbers() {
        return numbers;
    }

    public int getSum() {
        int sum = 0;
        for (Integer i : numbers)
        {
            sum += i;
        }
        return sum;
    }
}

 

결과