Apache HttpClient making multipart form post

Use MultipartEntityBuilder from the HttpMime library to perform the request you want.

In my project I do that this way:

HttpEntity entity = MultipartEntityBuilder    .create()    .addTextBody("number", "5555555555")    .addTextBody("clip", "rickroll")    .addBinaryBody("upload_file", new File(filePath), ContentType.APPLICATION_OCTET_STREAM, "filename")    .addTextBody("tos", "agree")    .build();HttpPost httpPost = new HttpPost("http://some-web-site");httpPost.setEntity(entity);HttpResponse response = httpClient.execute(httpPost);HttpEntity result = response.getEntity();

Hope this will help.

(Updated this post to use MultipartEntityBuilder instead of deprecated MultipartEntity, using @mtomy code as the example)

MultipartEntity now shows up as deprecated. I am using apache httpclient 4.3.3 - does anyone know what we are supposed to use instead? I find the google searches to be so full of MultipartEntity examples I can't find anything. – vextorspace Mar 31 '14 at 20:36

Here is the sample code in HttpClient 4.3.x

http://hc.apache.org/httpcomponents-client-4.3.x/httpmime/examples/org/apache/http/examples/entity/mime/ClientMultipartFormPost.java

import org.apache.http.entity.mime.MultipartEntityBuilder;HttpPost httppost = new HttpPost("http://localhost:8080" +        "/servlets-examples/servlet/RequestInfoExample");FileBody bin = new FileBody(new File(args[0]));StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);HttpEntity reqEntity = MultipartEntityBuilder.create()        .addPart("bin", bin)        .addPart("comment", comment)        .build();httppost.setEntity(reqEntity);

To use the class MultipartEntityBuilder, you need httpmime, which is a sub project of HttpClient

HttpClient 4.3.x:

http://hc.apache.org/httpcomponents-client-4.3.x/index.html

httpmime 4.3.x:

http://hc.apache.org/httpcomponents-client-4.3.x/httpmime/dependency-info.html

if use org.apache.commons.httpclient.HttpClient package, maybe that can help you!

    HttpConnectionManager httpConnectionManager = new MultiThreadedHttpConnectionManager();    //here should set HttpConnectionManagerParams but not important for you    HttpClient httpClient = new HttpClient(httpConnectionManager);    PostMethod postMethod = new PostMethod("http://localhost/media");    FilePart filePart = new FilePart("file", new File(filepath));    StringPart typePart = new StringPart("type", fileContent.getType(), "utf-8");    StringPart fileNamePart = new StringPart("fileName", fileContent.getFileName(), "utf-8");    StringPart timestampPart = new StringPart("timestamp", ""+fileContent.getTimestamp(),"utf-8");    Part[] parts = { typePart, fileNamePart, timestampPart, filePart };    MultipartRequestEntity multipartRequestEntity = new MultipartRequestEntity(parts, postMethod.getParams());    postMethod.setRequestEntity(multipartRequestEntity);    httpClient.executeMethod(postMethod);    String responseStr = postMethod.getResponseBodyAsString();