在 HTML 中调用 Java 方法

Question

This is what I am trying to do:

I have written a Java program which requires two file paths as input parameters. The code is working fine and accurate. The problem here is that every time I need to give the complete file path in command prompt. So what I thought is to link this with a HTML page which will give you two browse button in order to browse file.

Now my problem is how to give the two browsed file path in a Java method. I had written entire Java code in batch file as of now. I tried using <input type=file> in HTML, but how to pass this value in Java that I am unaware of?

Answer 1

You can build a servlet for this. Once you browse for files in html submit your html form to that servlet which does operation on that files. To point to that servlet give its relative url in action parameter of form tag. Or if you do not want to go in web development using server then use Applet they can also be a medium for communication between java and browser.

Answer 2

Make an entirely Java UI, using Swing/AWT.

You cannot use <input type="file" . My initial thought was that an applet will do, but check this answer . You can still use an applet, but you should browse the file from java, not from the browser.

Answer 3

Why not replace the web page with a Java GUI - Swing perhaps? You could use a javax.swing.JFileChooser to browse the file system, get a filepath, and run the rest of your program with that. It sounds like this would satisfy your requirements.

Answer 4

If this application is to be used on the desktop you don't need servlets or HTML, simply pop up two JFileChoosers and select the files using these.

The code to do this is:

import java.io.File;

import javax.swing.JFileChooser;

public class Main {
    public static void main(String[] args) {
        JFileChooser fc = new JFileChooser();
        fc.showOpenDialog(null);
        File f1 = fc.getSelectedFile();
        fc.showOpenDialog(null);
        File f2 = fc.getSelectedFile();
        System.out.println(f1.getName());
        System.out.println(f2.getName());
        /* make sure to make some checks to the files f1, f2 */
    }
}

Have fun: :D