org.gs4tr.gcc.restclient.util.MultipartUtility Maven / Gradle / Ivy

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GlobalLink Connect Cloud java is a library to connect your system to GlobalLink Connect Cloud REST API.
There is a newer version: 3.1.3
package org.gs4tr.gcc.restclient.util;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;

import javax.net.ssl.HttpsURLConnection;

import org.gs4tr.gcc.restclient.GCConfig;

/**
 * This utility class provides an abstraction layer for sending multipart HTTP
 * POST requests to a web server.
 * @author www.codejava.net
 *
 */
public class MultipartUtility {
    private final String boundary;
    private static final String LINE_FEED = "\r\n";
    private HttpsURLConnection httpConn;
    private String charset = "UTF-8";
    private OutputStream outputStream;
    private PrintWriter writer;
 
    public MultipartUtility(String requestURL, GCConfig config)
            throws IOException {
         
        boundary = "===" + System.currentTimeMillis() + "===";
         
        URL url = new URL(requestURL);
        httpConn = (HttpsURLConnection) url.openConnection();
        httpConn.setRequestMethod("POST");
        httpConn.setRequestProperty("connector_key", config.getConnectorKey());
        httpConn.setRequestProperty("Authorization", "Bearer " + config.getBearerToken());
        httpConn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true); // indicates POST method
        httpConn.setDoInput(true);
        httpConn.setRequestProperty("Content-Type",
                "multipart/form-data; boundary=" + boundary);
        outputStream = httpConn.getOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
                true);
    }
 
    public void addFormField(String name, String value) {
        writer.append("--" + boundary).append(LINE_FEED);
        writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
                .append(LINE_FEED);
        writer.append("Content-Type: text/plain; charset=" + charset).append(
                LINE_FEED);
        writer.append(LINE_FEED);
        writer.append(value).append(LINE_FEED);
        writer.flush();
    }
 
    public void addFilePart(String fieldName, byte[] uploadFile, String fileName)
            throws IOException {
        //String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE_FEED);
        writer.append(
                "Content-Disposition: form-data; name=\"" + fieldName
                        + "\"; filename=\"" + fileName + "\"")
                .append(LINE_FEED);
        writer.append(
                "Content-Type: "
                        + URLConnection.guessContentTypeFromName(fileName))
                .append(LINE_FEED);
        writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
        writer.append(LINE_FEED);
        writer.flush();
 
        outputStream.write(uploadFile);
        outputStream.flush();
         
        writer.append(LINE_FEED);
        writer.flush();    
    }
 
    public void addHeaderField(String name, String value) {
        writer.append(name + ": " + value).append(LINE_FEED);
        writer.flush();
    }
     
    public HttpsURLConnection finish() throws IOException {
 
        writer.append(LINE_FEED).flush();
        writer.append("--" + boundary + "--").append(LINE_FEED);
        writer.close();
 
        return httpConn;
    }
}