RestTemplate - get방식 : Server 코드 설명

Client 역할의 서버 관련 글:

2023.06.20 - [내배캠 주요 학습/Spring 심화] - RestTemplate - get방식 : Client 서버 코드 설명

 

[controller] - 

package com.sparta.springresttemplateserver.controller;

import com.sparta.springresttemplateserver.dto.ItemResponseDto;
import com.sparta.springresttemplateserver.dto.UserRequestDto;
import com.sparta.springresttemplateserver.entity.Item;
import com.sparta.springresttemplateserver.service.ItemService;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/server")
public class ItemController {

    private final ItemService itemService;

    public ItemController(ItemService itemService) {
        this.itemService = itemService;
    }

    @GetMapping("/get-call-obj")
    public Item getCallObject(@RequestParam String query) {
        return itemService.getCallObject(query);
    }

    @GetMapping("/get-call-list")
    public ItemResponseDto getCallList() {
        return itemService.getCallList();
    }

    @PostMapping("/post-call/{query}")
    public Item postCall(@PathVariable String query, @RequestBody UserRequestDto requestDto) {
        return itemService.postCall(query, requestDto);
    }

    @PostMapping("/exchange-call")
    public ItemResponseDto exchangeCall(@RequestHeader("X-Authorization") String token, @RequestBody UserRequestDto requestDto) {
        return itemService.exchangeCall(token, requestDto);
    }
}

 

[dto] - 

package com.sparta.springresttemplateserver.dto;

import com.sparta.springresttemplateserver.entity.Item;
import lombok.Getter;

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

@Getter
public class ItemResponseDto {
    private final List<Item> items = new ArrayList<>();

    public void setItems(Item item) {
        items.add(item);
    }
}

[dto] - 

package com.sparta.springresttemplateserver.dto;

import lombok.Getter;

@Getter
public class UserRequestDto {
    private String username;
    private String password;
}

 

[entity] - 

package com.sparta.springresttemplateserver.entity;

import lombok.Getter;

@Getter
public class Item {
    private String title;
    private int price;

    public Item(String title, int price) {
        this.title = title;
        this.price = price;
    }
}

 

[service] - 

package com.sparta.springresttemplateserver.service;

import com.sparta.springresttemplateserver.dto.ItemResponseDto;
import com.sparta.springresttemplateserver.dto.UserRequestDto;
import com.sparta.springresttemplateserver.entity.Item;
import org.springframework.stereotype.Service;

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

@Service
public class ItemService {

    private final List<Item> itemList = Arrays.asList(
            new Item("Mac", 3_888_000),
            new Item("iPad", 1_230_000),
            new Item("iPhone", 1_550_000),
            new Item("Watch", 450_000),
            new Item("AirPods", 350_000)
    );

    public Item getCallObject(String query) {
        for (Item item : itemList) {
            if(item.getTitle().equals(query)) {
                return item;
            }
        }
        return null;
    }

    public ItemResponseDto getCallList() {
        ItemResponseDto responseDto = new ItemResponseDto();
        for (Item item : itemList) {
            responseDto.setItems(item);
        }
        return responseDto;
    }

    public Item postCall(String query, UserRequestDto requestDto) {
        return null;
    }

    public ItemResponseDto exchangeCall(String token, UserRequestDto requestDto) {
        return null;
    }
}

 

 

Server의 역할

 

1. Controller를 통해 요청을 받는다.

    @GetMapping("/get-call-obj")
    public Item getCallObject(@RequestParam String query) {
        return itemService.getCallObject(query);
    }

    @GetMapping("/get-call-list")
    public ItemResponseDto getCallList() {
        return itemService.getCallList();
    }

 

2. 해당 String query 값에 맞는 Item을 반환한다.

    public Item getCallObject(String query) {
        for (Item item : itemList) {
            if(item.getTitle().equals(query)) {
                return item;
            }
        }
        return null;
    }

 

요청이 들어오면 모든 itemList를 ItemResponseDto 클래스 타입의 객체 내에 멤버변수인 

private final List<Item> items = new ArrayList<>();

items에 set한 후에 객체를 반환한다.

    public ItemResponseDto getCallList() {
        ItemResponseDto responseDto = new ItemResponseDto();
        for (Item item : itemList) {
            responseDto.setItems(item);
        }
        return responseDto;
    }