Generate mixed/multipart HTTP request in Java

Question

I would like to POST (in Java) a multipart/mixed request, where one part is of type 'application/json' and the other of type 'application/pdf'. Does anyone know of a library which will allow me to do this easily? Surprisingly I haven't been able to find one.

I'll generate the JSON, but I need to be able to set the content type of that part to 'application/json'.

Many thanks, Daniel

Maurício Linhares · Accepted Answer · 2012-05-30 19:33:47Z

4

Easy, use the Apache Http-client library (this code used version 4.1 and the jars httpclient, httpcore and httpmime), here's a sample:

package com.officedrop.uploader;

import java.io.File;
import java.net.URL;

import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;

public class SampleUploader {

    public static void main(String[] args) throws Exception {

        DefaultHttpClient httpclient = new DefaultHttpClient();
        String basePath = "http://localhost/";

        URL url = new URL( basePath );

        HttpHost targetHost = new HttpHost( url.getHost(), url.getPort(), url.getProtocol() );  

        HttpPost httpost = new HttpPost( String.format( "%s%s", basePath, "ze/api/documents.xml"));

        MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);

        entity.addPart("file_1", new FileBody( new File( "path-to-file.pdf" ) , "file.pdf", "application/pdf", null));
        entity.addPart("uploaded_data_1", new FileBody( new File( "path-to-file.json" ) , "file.json", "application/json", null));    

        httpost.setEntity(entity);

        HttpResponse response = httpclient.execute( targetHost, httpost);

    }

}

answered May 30, 2012 at 19:33

Maurício Linhares

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3 Comments

Daniel Over a year ago

Hi Maurício, thanks for the suggestion. However the request is generated with a 'multipart/form-data' content-type instead of 'multipart/mixed'. I haven't found a way to change that, do you know how?

Maurício Linhares Over a year ago

Why do you need it to be mixed? Any specific reason? Any HTTP server/framework will be able to decode these files correctly.

Daniel Over a year ago

The documentation for the service I'm calling requires mixed, but it appears now that the documentation is in error. :) Thanks again!

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