我需要下载文件从URL在我的自定义路径编程由java在SWT

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class FileDownloader {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(3, false));

        Label urlLabel = new Label(shell, SWT.NONE);
        urlLabel.setText("URL:");

        Text urlText = new Text(shell, SWT.BORDER);
        urlText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));

        Label pathLabel = new Label(shell, SWT.NONE);
        pathLabel.setText("Path:");

        Text pathText = new Text(shell, SWT.BORDER);
        pathText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

        Button browseButton = new Button(shell, SWT.PUSH);
        browseButton.setText("Browse");

        Button downloadButton = new Button(shell, SWT.PUSH);
        downloadButton.setText("Download");

        browseButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                FileDialog dialog = new FileDialog(shell, SWT.SAVE);
                String filePath = dialog.open();
                if (filePath != null) {
                    pathText.setText(filePath);
                }
            }
        });

        downloadButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                String url = urlText.getText();
                String path = pathText.getText();
                // 在这里添加下载文件的代码
            }
        });

        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
}

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

downloadButton.addSelectionListener(new SelectionAdapter() {
    @Override
    public void widgetSelected(SelectionEvent e) {
        String url = urlText.getText();
        String path = pathText.getText();
        try {
            URL fileUrl = new URL(url);
            URLConnection connection = fileUrl.openConnection();
            BufferedInputStream inputStream = new BufferedInputStream(connection.getInputStream());
            FileOutputStream outputStream = new FileOutputStream(path);
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer, 0, 1024)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.close();
            inputStream.close();
            System.out.println("File downloaded successfully.");
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
});