Question

我开发了一个程序，我希望将不同的文件保存为 zip 作为备份，然后在单击还原按钮时将其加载回来。我有下面的保存文件代码但是如何使用JFileChooser加载此文件？我不需要将它读取到程序中，只需将其解压缩到我的应用程序所在的文件夹中即可。我该怎么做？我的创建邮政编码如下：

public void createZip(){

    byte[] buffer = new byte[1024];
    String[] srcFiles = {"Payments.dat", "PaymentsPosted.dat", "Receipts.dat", "ReceiptsPosted.dat", "AccountDetails.dat", "AssetsLiabilities.dat", "UnitDetails.dat"};
    String zipFile = "Backups.zip";

    try{

        FileOutputStream fos = new FileOutputStream(zipFile);
        ZipOutputStream zos = new ZipOutputStream(fos);

        for (int i=0; i < srcFiles.length; i++) {
            File srcFile = new File(srcFiles[i]);
            FileInputStream fis = new FileInputStream(srcFile);

            // begin writing a new ZIP entry, positions the stream to the start of the entry data
            zos.putNextEntry(new ZipEntry(srcFile.getName()));

            int length;
            while ((length = fis.read(buffer)) > 0) {
                zos.write(buffer, 0, length);
            }

            zos.closeEntry();
            // close the InputStream
            fis.close();
        }

        // close the ZipOutputStream
        zos.close();

        }catch(IOException ex){
           ex.printStackTrace();
        }
        JOptionPane.showMessageDialog(null,"File Saved! See Backups.zip in your program folder");
    }
}

如果有人能告诉我如何将上述方法包装到JFileChooser中以保存，我还是很感激。

Answer 1

要创建JFileChooser，代码如下所示：

public void showOpenDialog() {

    // Create a filter so that we only see .zip files
    FileFilter filter = new FileNameExtensionFilter(null, "zip");

    // Create and show the file filter
    JFileChooser fc = new JFileChooser();
    fc.setFileFilter(filter);
    int response = fc.showOpenDialog(null);

    // Check the user pressed OK, and not Cancel.
    if (response == JFileChooser.APPROVE_OPTION) {
        File yourZip = fc.getSelectedFile();
        // Do whatever you want with the file
        // ...
    }        
}

就实际解压缩压缩文件而言，您可以找到更多信息here。

使用JFileChooser加载并读取zip文件？

1 个答案: