如何創建一個方法來填補一個Excel表

Question

我想創建一個方法來填補一個Excel表，如果它被填充或不，但我不知道我怎麼能實現代碼時Excel表是填補了。有人能幫助我嗎？下面是代碼：

蔭使用API​​ JXL

public void fillData(JTable table, File file) { 

    try { 

     boolean controladorExcel = false; //Excel controler, if is filled up or not 

     Workbook workbookPreenchido = Workbook.getWorkbook(new File(file.getName())); //workbook is filled up 

     Sheet sheet = workbookPreenchido.getSheet(0); 

      Cell a1 = sheet.getCell(0, 0); 

      String as1 = a1.getContents(); 

      if(as1 == null){ 
       controladorExcel = true; //Excel table is blank 
      }else{ 
       controladorExcel = false; //Excel table is filled up 
      } 


     workbookPreenchido.close(); 

     if (controladorExcel == true) { //If the excel table is blank 
      WritableWorkbook workbookVazio = Workbook.createWorkbook(file); //workbook is blank 


      WritableSheet sheet1 = workbookVazio.createSheet("First Sheet", 0); 
      TableModel model = table.getModel(); 

      for (int i = 0; i < model.getColumnCount(); i++) { 
       Label column = new Label(i, 0, model.getColumnName(i)); 
       sheet1.addCell(column); 
      } 
      int j = 0; 
      for (int i = 0; i < model.getRowCount(); i++) { 
       for (j = 0; j < model.getColumnCount(); j++) { 
        Label row = new Label(j, i + 1, 
          model.getValueAt(i, j).toString()); 
        sheet1.addCell(row); 
       } 
      } 
      workbookVazio.write(); 
      workbookVazio.close(); 

     }else{ //If the excel table is filled up 

     }   

    } catch (Exception ex) { 
     ex.printStackTrace(); 
    } 
} 

Answer 1

package JustTry; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.File; 

import javax.swing.*; 
import javax.swing.table.*; 

import jxl.*; 
import jxl.write.*; 

public class dexceleporte { 

    void fillData(JTable table, File file) { 

     try { 

      WritableWorkbook workbook1 = Workbook.createWorkbook(file); 
      WritableSheet sheet1 = workbook1.createSheet("First Sheet", 0); 
      TableModel model = table.getModel(); 

      for (int i = 0; i < model.getColumnCount(); i++) { 
       Label column = new Label(i, 0, model.getColumnName(i)); 
       sheet1.addCell(column); 
      } 
      int j = 0; 
      for (int i = 0; i < model.getRowCount(); i++) { 
       for (j = 0; j < model.getColumnCount(); j++) { 
        Label row = new Label(j, i + 1, 
          model.getValueAt(i, j).toString()); 
        sheet1.addCell(row); 
       } 
      } 
      workbook1.write(); 
      workbook1.close(); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } 
    } 

    public static void main(String[] args) { 
     String[][] data = {{"Housewares", "Rs.1275.00"}, 
      {"Pets", "Rs.125.00"}, {"Electronics", "Rs.2533.00"}, 
      {"Menswear", "Rs.497.00"} 
     }; 
     String[] headers = {"Department", "Daily Revenue"}; 

     JFrame frame = new JFrame("JTable to Excel"); 
     DefaultTableModel model = new DefaultTableModel(data, headers); 
     final JTable table = new JTable(model); 
     JScrollPane scroll = new JScrollPane(table); 

     JButton export = new JButton("Export"); 
     export.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent evt) { 

       try { 
        dexceleporte exp = new dexceleporte(); 
        exp.fillData(table, new File("E:\\result.xls")); 
        JOptionPane.showMessageDialog(null, "Data saved at " + 
          "': \\ result.xls' successfully", "Message", 
          JOptionPane.INFORMATION_MESSAGE); 
       } catch (Exception ex) { 
        ex.printStackTrace(); 
       } 
      } 
     }); 

     frame.getContentPane().add("Center", scroll); 
     frame.getContentPane().add("South", export); 
     frame.pack(); 
     frame.setVisible(true); 
     frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE); 
     frame.setAlwaysOnTop(true); 

    } 
} 

Answer 2

package fridayPackage; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.File; 

import javax.swing.*; 
import javax.swing.table.*; 

import jxl.*; 
import jxl.write.*; 

public class ExcelExporter_UpdatesGood { 

    static int x=-2;  ////////Change this to -1 or 0, to leave 

    void fillData(JTable table, File file) { 

     try { 




      File a = new File("E:\\result.xls"); 

     ///////////////My New Code  
      if(!a.exists()) 
      { 
       System.out.println("The file doesn't exist."); 

          ////////////////Here it creates a new result.xls 

       try { 

        WritableWorkbook workbook1 = Workbook.createWorkbook(file); 
        WritableSheet sheet1 = workbook1.createSheet("First Sheet", 0); 
        TableModel model = table.getModel(); 

        for (int i = 0; i < model.getColumnCount(); i++) {     //////Remove this for loop and Tell what all columns 
         Label column = new Label(i+1, 0, model.getColumnName(i));  //////have to be there. 
         sheet1.addCell(column); 
        } 
        int j = 0; 
        for (int i = 0; i < model.getRowCount(); i++) { 
         for (j = 0; j < model.getColumnCount(); j++) { 
          Label row = new Label(i + 1,j, model.getValueAt(i, j).toString()); 
          sheet1.addCell(row); 
         } 
        } 
        workbook1.write(); 
        workbook1.close(); 
       } catch (Exception ex) { 
        ex.printStackTrace(); 
       }   

          ////////////////New File Creation over 

      } 


      else 
      { 


    ////////////////My New Code Over  

      Workbook workbook1 = Workbook.getWorkbook(a); 

    //  WritableWorkbook workbook1 = Workbook.createWorkbook(file); 
      WritableWorkbook copy = Workbook.createWorkbook(file, workbook1); 

      WritableSheet sheet2 = copy.getSheet(0); 


      TableModel model = table.getModel(); 

      for (int i = 0; i < model.getRowCount(); i++) {   //////Remove this for loop and Tell what all columns 
       Label row = new Label(i+1,0, "Hello_Column");  //////have to be there. 
       sheet2.addCell(row); 
      } 


      int j = 0; 
      for (int i = 0; i < model.getRowCount(); i++) { 
       for (j = 1; j < model.getColumnCount(); j++) { 
        Label row = new Label(i + 1 ,j + x + 1 , model.getValueAt(i, j).toString()); ///make it i + 1 - 1 
        sheet2.addCell(row); 


       } 
      } 


      copy.write(); 
      copy.close(); 
     }       //////////////////Closing Else for File exists or not 


     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } 
    } 

    public static void main(String[] args) { 
     String[][] data = {{"Housewares", "Rs.1275.00"}, 
      {"Pets", "Rs.125.00"}, {"Electronics", "Rs.2533.00"}, 
      {"Menswear", "Rs.497.00"} 
     }; 
     String[] headers = {"Field1", "Field2"}; 

     JFrame frame = new JFrame("JTable to Excel"); 
     DefaultTableModel model = new DefaultTableModel(data, headers); 

     final JTable table = new JTable(model); 
     JScrollPane scroll = new JScrollPane(table); 

     JButton export = new JButton("Export"); 
     export.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent evt) { 

       try { 
        ExcelExporter_UpdatesGood exp = new ExcelExporter_UpdatesGood(); 

        File a = new File ("E:\\result.xls"); 

        x=x+1;    //////Incrementing x here 

        exp.fillData(table, a); 


        JOptionPane.showMessageDialog(null, "Data saved at " + 
          "'E: \\ result.xls' successfully", "Message", 
          JOptionPane.INFORMATION_MESSAGE); 
       } catch (Exception ex) { 
        ex.printStackTrace(); 
       } 
      } 
     }); 

     frame.getContentPane().add("Center", scroll); 
     frame.getContentPane().add("South", export); 
     frame.pack(); 
     frame.setVisible(true); 
     frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE); 
     frame.setAlwaysOnTop(true); 
    } 
}