🈹

ApiExecutor 분리 - 인터페이스 도입과 클래스 분리

생성일

2025/01/24 05:52

태그

•

ApiExecutor 인터페이스 생성

package tobyspring.hellospring.api;

import java.io.IOException;
import java.net.URI;

public interface ApiExecutor {
    String execute(URI uri) throws IOException;
}
Java
복사

•

SimpleApiExecutor 클래스 생성

package tobyspring.hellospring.api;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.util.stream.Collectors;

public class SimpleApiExecutor implements ApiExecutor {
    @Override
    public String execute(URI uri) throws IOException {
        String response;
        HttpURLConnection connection = (HttpURLConnection) uri.toURL().openConnection();
        try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
            response = br.lines().collect(Collectors.joining());
        }
        return response;
    }
}
Java
복사

•

WebApiExrateProvider 수정

package tobyspring.hellospring.exrate;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import tobyspring.hellospring.api.SimpleApiExecutor;
import tobyspring.hellospring.payment.ExRateProvider;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.stream.Collectors;


public class WebApiExRateProvider implements ExRateProvider {
    @Override
    public BigDecimal getExRate(String currency) {
        String url = "https://open.er-api.com/v6/latest/" + currency;
        return runApiForExRate(url);
    }

    private static BigDecimal runApiForExRate(String url) {
        URI uri;                 // URL -> URI 변경
        try {
            uri = new URI(url);
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }

        String response;
        try {
            response = new SimpleApiExecutor().execute(uri);       // 수정
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        // build gradle에서 의존성 추가
        // 'com.fasterxml.jackson.core:jackson-databind:2.12.5'
        try {
            return extractExRate(response);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    private static BigDecimal extractExRate(String response) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        ExRateData data = mapper.readValue(response, ExRateData.class);
        return data.rates().get("KRW");
    }
}
Java
복사