[JAVA] POST multipart/form-data 요청하기

1. pom.xml  -  dependency 추가

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httpmime 검색해서 원하는 버전 선택해서 pom.xml에 dependency를 추가

추가된 것을 확인

2. 라이브러리를 이용하여 post (multipart/form-data) 요청

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class Main {
	public static void main(String[] args) throws IOException {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpPost uploadFile = new HttpPost("URL");
		MultipartEntityBuilder builder = MultipartEntityBuilder.create();
		builder.addTextBody("name", "sejin");
		builder.addTextBody("key", "value");

		File file = new File("C:\\Users\\tpwls\\Downloads\\test.png");

		builder.addBinaryBody("image", new FileInputStream(file), ContentType.APPLICATION_OCTET_STREAM, file.getName());

		HttpEntity multipart = builder.build();
		uploadFile.setEntity(multipart);
		CloseableHttpResponse response = httpClient.execute(uploadFile);
		HttpEntity responseEntity = response.getEntity();

		InputStream is = responseEntity.getContent();
		BufferedReader r = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));

		String line = null;
		StringBuilder sb = new StringBuilder();

		while ((line = r.readLine()) != null) {
			sb.append(line);
		}

		System.out.println(sb.toString());
	}
}