rj93 rj93 - 1 year ago 76
Java Question

Java upload a file to api endpoint

So I am trying to upload a file to imgur's endpoint, in binary format. The api needs the file to be mapped to the

key, but I'm struggling to firgure out how I can do this.

How can this be achieved?

EDIT: I tried using extracts of this post, but couldn't get it to work.

Answer Source
public static String simSearchByImg(File file,int  catid ,String subject,String labeland,String labelor,String labelnot) throws IOException{
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String result =null;
        try {
            HttpPost httppost = new HttpPost("http://api0.visualsearchapi.com:8084/vsearchtech/api/v1.0/apisim_search");

            FileBody bin = new FileBody(file);
            StringBody catidBody = new StringBody(catid+"" , ContentType.TEXT_PLAIN);
            StringBody keyBody = new StringBody(APPKEY , ContentType.TEXT_PLAIN);
            StringBody langBody = new StringBody(LANG , ContentType.TEXT_PLAIN);
            StringBody fmtBody = new StringBody(FMT , ContentType.TEXT_PLAIN);
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.addPart("apikey", keyBody)
            .addPart("photo", bin)
            .addPart("catid", catidBody)
            .addPart("lang", langBody)
            .addPart("fmt", fmtBody);
             if(subject != null && subject.isEmpty() == false){
                 StringBody subjectBody = new StringBody(subject, Charset.forName("UTF-8"));
                 builder.addPart("subject", subjectBody);
             if(labeland != null && labeland.isEmpty() == false){
                 StringBody labelandBody = new StringBody(labeland , ContentType.TEXT_PLAIN);
                 builder .addPart("labeland", labelandBody);
             if(labelor != null && labelor.isEmpty() == false){
                 StringBody labelorBody = new StringBody(labelor , ContentType.TEXT_PLAIN);
                 builder .addPart("labelor", labelorBody);
             if(labelnot != null && labelnot.isEmpty() == false){
                 StringBody labelnotBody = new StringBody(labelnot , ContentType.TEXT_PLAIN);
                 builder .addPart("labelnot", labelnotBody);
            HttpEntity reqEntity =  builder.build();
            response = httpClient.execute(httppost);
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
               // result = ConvertStreamToString(resEntity.getContent(), "UTF-8");
                String charset = "UTF-8";   
              String content=EntityUtils.toString(response.getEntity(), charset);   
        }catch(Exception e){
        }finally {
        return result;

public static void main(String[] args) {
    try {
        simSearchByImg(new File("/path/dog1.jpg"),0,null,null,null,null);
        /*Above Java request upload an image /path/dog1.jpg, search for 
        visually similar images,by using your apikey, values of other parameters 
        are as default*/
        simSearchByImg(new File("/path/dog1.jpg"),45,"pet","345,356",null,"98")
        /*Above Java request upload an image dog1.jpg, search for visually similar 
        images, by using your apikey, search for similar images with keyword “pet”, 
        image category as 45, and result images have labels 345 and 356, 
        but without label 98.  Values of other parameters are as default*/   
    } catch (Exception e) {
        // TODO Auto-generated catch block