Upload a file in cloud space(multipart upload operation) using HttpClient

To use below program, to upload a file easily in could space.
we will illustrate how to do a multipart upload operation using HttpClient.

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.LinkedHashMap;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.tomcat.util.http.fileupload.FileItem;
import org.apache.tomcat.util.http.fileupload.disk.DiskFileItem;
import org.springframework.web.multipart.MultipartFile;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;

/**
* This class is used for uploading image in cloud
*/
public class UploadImage {

public static void main(String[] args) throws IOException {
httpImageTest();
//convertFileFromMultipartFile - convert multipart file to file object

     }

    private static void httpImageTest() throws ClientProtocolException, IOException {
        File file = new File(""); //c:/image/test.jpeg
        CloseableHttpClient client = HttpClients.createDefault();
        HttpPost post = new HttpPost("");
        post.addHeader("", "");
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        builder.addTextBody("Content-Type", "image/jpeg");
        builder.addBinaryBody("file", file, ContentType.DEFAULT_BINARY, "fileName.jpeg");

        HttpEntity entity = builder.build();
        post.setEntity(entity);
        HttpResponse response = client.execute(post);
        System.out.println(response.getStatusLine());
        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        StringBuffer result = new StringBuffer();
        String line = "";
        while ((line = rd.readLine()) != null)
            result.append(line);
        System.out.println(formatXML(result.toString()));
        client.close();
    }

private static File convertFileFromMultipartFile(MultipartFile file) throws IOException {
        File convFile = new File(file.getOriginalFilename());
        convFile.createNewFile();
        FileOutputStream fos = new FileOutputStream(convFile);
        fos.write(file.getBytes());
        fos.close();
        return convFile;
    }

    private static String formatXML(String input) {
        try {
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "3");

            StreamResult result = new StreamResult(new StringWriter());
            DOMSource source = new DOMSource(parseXml(input));
            transformer.transform(source, result);
            return result.getWriter().toString();
        } catch (Exception e) {
            e.printStackTrace();
            return input;
        }
    }

    private static Document parseXml(String in) {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader(in));
            return db.parse(is);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

Reference: http://www.baeldung.com/httpclient-multipart-upload