PlayFramework2.2.1で、jQuery使ってファイルアップロード

Application.java

public static Result upload() {
	MultipartFormData file = request().body().asMultipartFormData();
	String extraData = file.asFormUrlEncoded().get("ExtraData")[0]; // => hogehoge
	ObjectNode jsonData = Json.newObject();
	jsonData.put("status", "OK");
	return ok(jsonData);
}

routes

GET /file/to/upload controller.Application.upload()

upload.html

<input type="file" id="file">
<a href="#" id="send">

upload.js

$("#send").click(function() {
	var data = new FormData($("#file"));
	data.append("ExtraData", "hogehoge");

	$.ajax({
		url: "/file/to/upload",
		type: "POST",
		data: data,
		processData: false,
		contentType: false,
		success: function(result) {
			alert(result.status);
		}
	});
});