Play Framework：使用WS将图像发布到imageshack

Question

I am trying to POST an image to imageshack using their API and Play Framework's WSRequest object.

My code is as follows:

public static void upload( Picture picture ) throws Exception {

    //set file parameter - in this case the image
    WS.FileParam fp = new WS.FileParam( picture.asFile, "fileupload");

    //set other parameters
    Map<String,Object> params = new HashMap<String, Object>();
    params.put( "optsize", "resample" );
    params.put( "rembar", "yes" );
    params.put( "public", "no" );
    params.put( "a_username", username );
    params.put( "a_password", password );
    params.put( "key", a_key );

    //POST request
    Document doc = WS.url( "http://www.imageshack.us/upload_api.php" )
        .setHeader( "Content-Type", picture.contentType )
        .mimeType( "multipart/form-data" )
        .params( params )
        .files( fp )
        .post()
        .getXml();
}

However, I always reveive the following response from imageshack:

I have tried sending the file as a parameter using a byte array:

params.put( "fileupload", Base64.encode( picture.asBytes )  )

But this also results in the same response from Imageshack.

This is driving me mad. Can anyone point out where I am going wrong or possibly point me in the direction of a better solution? Thanks.

---

The cause

After a bit of research I found that I had neglected a bit of important information from this question....I am including the Google App Engine module within my app.

According to the Play Framework Google Group the code associated with attaching Files to a WS request when using GAE is actually just commented out. Hence the reason it just doesn't work. So no error thrown for you and no indication why it doesn't work...you just have to work it out.

I have accepted @Gary's answer as it is the correct way to upload an image to imageshack using WS - just not when using GAE.

Answer 1

I don't think you need to specify the content type or mime type directly.

I used the following code to upload successfully.

WS.FileParam fp = new WS.FileParam(
      new File("d:\\workspace\\ImageShackTest\\sample_picture.png"), "fileupload");

    Map<String,Object> params = new HashMap<String, Object>();
    params.put( "optsize", "resample" );
    params.put( "rembar", "yes" );
    params.put( "public", "yes" );
    //params.put( "a_username", username );
    //params.put( "a_password", password );
    params.put( "key", API_KEY );

    //POST request
    Document doc = WS.url( "http://www.imageshack.us/upload_api.php" )
        .params( params )
        .files( fp )
        .post()
        .getXml();

I think when you attach a file to a request it automatically decides its going to be multipart/form-data.

This is my entire controller (except for the API Key)

package controllers;

import play.*;
import play.mvc.*;
import java.util.*;
import models.*;
import play.libs.*;
import java.io.File;

public class Application extends Controller {

    public static void index() { render(); }

    private static final String API_KEY = "API KEY REMOVED TO PROTECT THE INNOCENT";

    public static void tryUpload() {
        WS.FileParam fp = new WS.FileParam( new File("d:\\workspace\\ImageShackTest\\sample_picture.png"), "fileupload");

        Map<String,Object> params = new HashMap<String, Object>();
        params.put( "optsize", "resample" );
        params.put( "rembar", "yes" );
        params.put( "public", "yes" );
        params.put( "key", API_KEY );

        String doc = WS.url( "http://www.imageshack.us/upload_api.php" )
            .params( params )
            .files( fp )
            .post()
            .getString();

        System.out.println(doc);

        index();
    }
}

and this is the application.conf file

# This is the main configuration file for the application.
# ~~~~~
application.name=ImageShackTest
application.mode=dev
%prod.application.mode=prod
application.secret=JIVQE8y3y1lCzXRGprFJvoXBdi8Jpa8qE1U1mBIooLLOOYk5yyhAI5cxbEf4q4pl
date.format=yyyy-MM-dd
attachments.path=data/attachments
mail.smtp=mock

I didn't make any other changes. Just browsed to http://localhost:9000/Application.tryUpload and could see the success XML on the play console.

Answer 2

You are setting the content type header incorrectly.

Instead of this:

.setHeader( "Content-Type", picture.contentType )

Try this:

.setHeader( "Content-Type", "multipart/form-data" )