java code to convert document(.docx) into .jpeg format. and then to .pdf

i am stucked at first part that is document to .jpeg conversion using java

here is my code to convert .docx to .jpg

import com.aspose.words.Document;
import com.aspose.words.ImageSaveOptions;
import com.aspose.words.SaveFormat;

/**
* Created by me
*/
public class Program {


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


new Program().generateImages("E:\\pro2\\Document.docx");
}

public void generateImages(final String sourcePath) {
try {
Document doc = new Document(sourcePath);
ImageSaveOptions options = new ImageSaveOptions(SaveFormat.JPEG);
options.setJpegQuality(100);
options.setResolution(100);

for (int i = 0; i < doc.getPageCount(); i++) {
String imageFilePath = sourcePath + "_output_" + i + ".jpg";
options.setPageIndex(i);
doc.save(imageFilePath, options);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}




the only problem is i wish to make an application and take the file as an input from user instead of specifying the whole path and file name as i did on my code

if i have to make application or button where user would upload the path or file, how to put up this in my code