如何使用JFileChooser在java中保存文件

我正在开发一个基于桌面的软件使用Java的挥杆，需要导出报告在PDF和Excel文件，并会接受用户的path。 我有出口报告在PDF和Excel文件，但现在我想接受来自用户的path和用户必须给该文件的名称。

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，它只创build当前目录中的excel文件和保存文件，并不接受来自用户的文件名。

任何人都可以build议我吗？

Answer 1

您只需在FileSave中创build一个空文件。

您必须从方法中返回选定的文件名，并在调用中使用返回的文件名

 FileOutputStream fileOut = new FileOutputStream(filename) 

BWT的java代码约定假设有方法名不从大写字母开始

Answer 2

你可以试试这个

 public void FileSave() throws IOException { JFileChooser chooser=new JFileChooser("."); FileNameExtensionFilter filter = new FileNameExtensionFilter("Excel files","xls","excel"); chooser.addChoosableFileFilter(filter); chooser.setFileFilter(filter); chooser.setFileSelectionMode(chooser.FILES_AND_DIRECTORIES); chooser.setDialogTitle("Save File"); chooser.setCurrentDirectory(new File(System.getProperties().getProperty("user.home"))); chooser.setFileFilter(new javax.swing.filechooser.FileFilter() { public boolean accept(final File f) { return f.isDirectory()|| file.getAbsolutePath().endsWith(".xls"); } public String getDescription() { return "Excel files (*.xls)"; } }); int returnVal1=chooser.showSaveDialog(this); if (returnVal1 == JFileChooser.APPROVE_OPTION) { file1 = chooser.getSelectedFile(); if(!file1.exists()) { FileOutputStream fileOut = new FileOutputStream(file1); hwb.write(fileOut); fileOut.close(); System.out.println("\n Your Excel file has been generated!"); JOptionPane.showMessageDialog(this,"File Created."); } else if(file1.exists()) { int res=JOptionPane.showConfirmDialog(this,"File already exists.Do you wish to overwrite?"); if(res == JOptionPane.YES_OPTION) { FileOutputStream fileOut = new FileOutputStream(file1); hwb.write(fileOut); fileOut.close(); System.out.println("\n Your Excel file has been generated!"); JOptionPane.showMessageDialog(this,"File Created."); } else if(res == JOptionPane.NO_OPTION) { int returnVal2=chooser.showSaveDialog(this); if (returnVal2 == JFileChooser.APPROVE_OPTION) { File file2 = chooser.getSelectedFile(); if(!file2.exists()) { FileOutputStream fileOut = new FileOutputStream(file2); hwb.write(fileOut); fileOut.close(); System.out.println("\n Your Excel file has been generated!"); JOptionPane.showMessageDialog(this,"File Created."); } } } else if (res == JOptionPane.CANCEL_OPTION) { JOptionPane.showMessageDialog(this, "User cancelled operation."); } } } }