URL을 파일로 복사

RemoteFileClient.java

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Path;
import java.time.Duration;

public class RemoteFileClient {
	private final HttpClient httpClient;
	private final Duration readTimeout;

	public RemoteFileClient(Duration connectionTimeout, Duration readTimeout) {
		this.httpClient = HttpClient.newBuilder()
			.connectTimeout(connectionTimeout)
			.build();
		this.readTimeout = readTimeout;
	}

	public void copyToPath(URI source, Path destination) {
		var request = HttpRequest.newBuilder()
			.uri(source)
			.timeout(this.readTimeout)
			.build();

		try {
			httpClient.send(request, HttpResponse.BodyHandlers.ofFile(destination));
		} catch (IOException | InterruptedException ex) {
			throw new IllegalStateException(ex);
		}
	}
}

RemoteFileClientTest.java

import static org.assertj.core.api.Assertions.assertThat;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;

class RemoteFileClientTest {

	@Test
	void copyToPath(@TempDir Path tempPath) throws IOException, URISyntaxException {
		var source = new URI("https://blog.benelog.net");
		Path destination = tempPath.resolve("test.html");

		var client = new RemoteFileClient(Duration.ofSeconds(10L), Duration.ofSeconds(10L));
		client.copyToPath(source, destination);

		assertThat(destination).exists();
		var content = Files.readString(destination);
		assertThat(content).contains("개발수양록");
	}
}