Java如何使用JFileChooser来保存Apache POI创建的excel文件

我想将电子表格文件保存到用户自定义文件夹，人们建议使用JFileChooser ，但实际上我不知道如何实现它。 我这里有我当前的示例代码：

 import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.poi.xssf.usermodel.XSSFCell; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class Example { public static void main(String[] args) throws FileNotFoundException, IOException { XSSFWorkbook workbook; File file = new File("example.xlsx"); if (file.exists() == false) { workbook = new XSSFWorkbook(); XSSFSheet exampleSheet = workbook.createSheet("1"); XSSFRow firstRow = exampleSheet.createRow(1); XSSFCell cell = firstRow.createCell(0); cell.setCellValue("value"); try ( //Write the workbook in file system FileOutputStream out = new FileOutputStream(file)) { workbook.write(out); } } else { // Sheet already exists System.out.println("File already exist"); } } } 

目前它只将文件保存到默认项目目录。 但我希望将其保存到用户选择的路径，并使用用户自定义文件名。 JFileChooser似乎是一个不错的选择，但有人可以告诉我如何在我的情况下使用它？

Answer 1

 public class Example { static String fileDictName = ""; public static void main(String[] args) throws FileNotFoundException, IOException { XSSFWorkbook workbook; JFileChooser fileChooser = new JFileChooser(); fileChooser.setDialogTitle("Open the file"); //name for chooser FileFilter filter = new FileNameExtensionFilter("Files", ".xlsx"); //filter to show only that fileChooser.setAcceptAllFileFilterUsed(false); //to show or not all other files fileChooser.addChoosableFileFilter(filter); fileChooser.setSelectedFile(new File(fileDictName)); //when you want to show the name of file into the chooser fileChooser.setVisible(true); int result = fileChooser.showOpenDialog(fileChooser); if (result == JFileChooser.APPROVE_OPTION) { fileDictName = fileChooser.getSelectedFile().getAbsolutePath(); } else { return; } File file = new File(fileDictName); if (file.exists() == false) { workbook = new XSSFWorkbook(); XSSFSheet exampleSheet = workbook.createSheet("1"); XSSFRow firstRow = exampleSheet.createRow(1); XSSFCell cell = firstRow.createCell(0); cell.setCellValue("value"); try ( //Write the workbook in file system FileOutputStream out = new FileOutputStream(file)) { workbook.write(out); } } else { // Sheet already exists System.out.println("File already exist"); } } } 

当我们想用它来保存文件时，我们需要：

 JFileChooser fileChooser = new JFileChooser(); FileFilter filter = new FileNameExtensionFilter("Files", ".xlsx"); fileChooser.addChoosableFileFilter(filter); fileChooser.setAcceptAllFileFilterUsed(false); fileChooser.setDialogTitle("Save the dictionary file"); fileChooser.setSelectedFile(new File(fileDictName)); int userSelection = fileChooser.showSaveDialog(fileChooser); if (userSelection == JFileChooser.APPROVE_OPTION) { fileDictName = fileChooser.getSelectedFile().getAbsolutePath(); } 

Answer 2

这是一个例子：

 JFileChooser jfc = new JFileChooser(); int res = jfc.showSaveDialog(this); if (res != JFileChooser.APPROVE_OPTION) { return; } File file = jfc.getSelectedFile();