[英]Problems in creating excel sheets with java
我試圖打開一個現有的excel文檔,並試圖創建一個工作表並將數據插入單元格中。 當我在eclipse中編譯我的代碼時,我沒有收到任何錯誤,但是當我運行我的代碼時,它不會影響excel文檔。
這是我的代碼
import java.io.*;
import java.io.FileInputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.ss.usermodel.*;
import java.io.File;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.JFrame;
import javax.swing.JButton;
public class test{
test()
{
JFrame f = new JFrame("Pay Slip Generator");
f.setVisible(true);
f.setSize(500, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout( new FlowLayout() );
JButton choose_file = new JButton("choose file");
f.add(choose_file);
choose_file.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
JFileChooser fileopen = new JFileChooser();
FileFilter filter = new FileNameExtensionFilter("c files", "c");
fileopen.addChoosableFileFilter(filter);
int ret = fileopen.showDialog(null, "Open file");
if (ret == JFileChooser.APPROVE_OPTION) {
File file = fileopen.getSelectedFile();
String path = file.getAbsolutePath();
System.out.println(path);
try
{
FileInputStream fis = new FileInputStream(path);
HSSFWorkbook wb = new HSSFWorkbook(fis);
int no_sheets = wb.getNumberOfSheets();
System.out.println(no_sheets);
HSSFSheet sheet = wb.createSheet("test");
HSSFRow row = sheet.createRow(10);
HSSFCell cell = row.createCell(10);
cell.setCellValue("Hello");
fis.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
});
}
public static void main(String args[])throws IOException
{
new test();
}
期待得到答復,謝謝。
它沒有影響,因為您沒有將數據寫回到Excel。 在cell.setCellValue("Hello");
之后插入以下行:
FileOutputStream out = new FileOutputStream(new File(path));
wb.write(out);
wb.close();
out.close();
執行代碼時,請確保您的Excel文件未打開。
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