Java SWT文件保存

Question

我在保存文件时遇到问题，因为我搜索过我写的很好，除了一件事，文件没有真正创建。缺少什么？

        Button btnExport = new Button(composite_1, SWT.NONE);
    btnExport.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            FileDialog fileSave = new FileDialog(pmComp, SWT.SAVE);
            fileSave.setFilterNames(new String[] {"CSV"});
            fileSave.setFilterExtensions(new String[] {"*.csv"});
            fileSave.setFilterPath("c:\"); // Windows path
            fileSave.setFileName("your_file_name.csv");
            fileSave.open();

            System.out.println("File Saved as: " + fileSave.getFileName());
        }
    });
    btnExport.setBounds(246, 56, 75, 40);
    btnExport.setText("Export");

Answer 1

来自 FileDialog :

Instances of this class allow the user to navigate the file system and select or enter a file name.

对话框不会自动创建文件，您必须检索选择的文件名，然后创建文件。

例如

String name = fileSave.getFileName();
File file = new File(name);
file.createNewFile();

Answer 2

FileDialog只是用来select文件保存的位置。它不是实际创建或写入文件 - 您必须这样做。

所以

String savePath = fileSave.open();

// TODO your code to write the file to savePath

Answer 3

import java.io.File;
import java.io.IOException;

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.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;

public class Snippet {
    public static void main(String[] args) {

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(1, false));

        Composite composite = new Composite(shell, SWT.NONE);
        composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        composite.setLayout(new GridLayout(1, false));

        Button btnExport = new Button(composite, SWT.NONE);
        btnExport.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {

                FileDialog fileSave = new FileDialog(shell, SWT.SAVE);
                fileSave.setFilterNames(new String[] { "CSV" });
                fileSave.setFilterExtensions(new String[] { "*.csv" });
                fileSave.setFilterPath("C:\"); // Windows path
                fileSave.setFileName("your_file_name.csv");
                String open = fileSave.open();
                File file = new File(open);
                try {
                    file.createNewFile();
                    System.out.println("File Saved as: " + file.getCanonicalPath());
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        });
        btnExport.setBounds(246, 56, 75, 40);
        btnExport.setText("Export");

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

    }
}

Java SWT文件保存

Java SWT file saving

java

user-interface

swt