java - 如何使用 JFileChooser 在 Java 中保存文件

Question

我正在使用 java swing 开发一种基于桌面的软件，它需要以 pdf 和 excel 文件的形式导出报告，并将接受来自用户的路径。我有 pdf 和 excel 文件的导出报告，但现在我想接受来自用户的路径，并且用户必须为该文件命名。

try
{
    String filename="sales111.xls" ;
    HSSFWorkbook hwb=new HSSFWorkbook();
    HSSFSheet sheet =  hwb.createSheet("Sales Report in Excel");

    HSSFRow rowhead=   sheet.createRow((short)0);
        rowhead.createCell((short) 0).setCellValue("Invoice Numberr");
        rowhead.createCell((short) 1).setCellValue("date");
        rowhead.createCell((short) 2).setCellValue("Customer Name");
        rowhead.createCell((short) 3).setCellValue("customer Code");
        rowhead.createCell((short) 4).setCellValue("Stock Item Name");
        rowhead.createCell((short) 5).setCellValue("Product Quantity");
        rowhead.createCell((short) 6).setCellValue("Product Rate");
        rowhead.createCell((short) 7).setCellValue("Total Amount");
        rowhead.createCell((short) 8).setCellValue("Tax Category");
        rowhead.createCell((short) 9).setCellValue("Tax Amount");
        rowhead.createCell((short) 10).setCellValue("Transport Charges");
        rowhead.createCell((short) 11).setCellValue("Net Amount");
        rowhead.createCell((short) 11).setCellValue("Credit Limit");

        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/BOA", "root", "root");
        Statement st=con.createStatement();
        ResultSet rs=st.executeQuery("Select * from SalesVoucher");
        int i=1;

        while(rs.next())
        {
            HSSFRow row=   sheet.createRow((short)i);
            row.createCell((short) 0).setCellValue(rs.getString("innum"));
            row.createCell((short) 1).setCellValue(rs.getString("date"));
            row.createCell((short) 2).setCellValue(rs.getString("scname"));
            row.createCell((short) 3).setCellValue(rs.getString("sccode"));
            row.createCell((short) 4).setCellValue(rs.getString("stname"));
            row.createCell((short) 5).setCellValue(Integer.toString(rs.getInt("pquantity")));
            row.createCell((short) 6).setCellValue(Double.toString(rs.getDouble("prate")));
            row.createCell((short) 7).setCellValue(Double.toString(rs.getDouble("samount")));
            row.createCell((short) 8).setCellValue(Double.toString(rs.getDouble("staxcat")));
            row.createCell((short) 9).setCellValue(Double.toString(rs.getDouble("stamount")));
            row.createCell((short) 10).setCellValue(Double.toString(rs.getDouble("strans")));
            row.createCell((short) 11).setCellValue(Double.toString(rs.getDouble("stota")));
            row.createCell((short) 11).setCellValue(Integer.toString(rs.getInt("scredlim")));

            i++;
        }

        FileOutputStream fileOut =  new FileOutputStream(filename);
        hwb.write(fileOut);
        fileOut.close();
        System.out.println("Your Sales Report Excel file has been generated!");

        String name1="";

        FileSave(filename,name1);
} 
catch ( Exception ex ) 
{
    System.out.println(ex);
}
}
public void FileSave(final String title,final String name)
{
      final JFileChooser chooser=new JFileChooser();
    //  chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
      chooser.setDialogTitle(title);
      chooser.setCurrentDirectory(new File(System.getProperties().getProperty("user.dir")));
      chooser.setFileFilter(new javax.swing.filechooser.FileFilter()
      {
         public boolean accept(final File f)
        {
          return f.isDirectory();
        }
        public String getDescription(){
          return "Folder To Save In";
        }
      }
    );
      final int r=chooser.showSaveDialog(null);
      File file;

      if (r == JFileChooser.APPROVE_OPTION) 
      {
        if (name != null) 
        {
            file=new File(chooser.getSelectedFile().getPath() + File.separator + name);
        }
        else 
        {
            // file=new File(filename);
          file=new File(chooser.getSelectedFile().getPath());
        }
      }
    }

这是我的代码，它创建 excel 文件并仅在当前目录中保存文件，并且不接受用户的文件名。

有人可以给我建议吗？

Answer 1

您只需在 FileSave 中创建一个空文件。

您必须从该方法返回选定的文件名并在调用中使用返回的文件名

FileOutputStream fileOut =  new FileOutputStream(filename)

BWT java 代码约定假设方法名不以大写字母开头