我正在尝试创建一个方法来填充excel表，如果它已填满或不，但我不知道如何在excel表填满时实现代码。有谁可以帮助我吗？这是代码：
我使用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();
}
}
答案 0 :(得分：0)
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);
}
}
答案 1 :(得分：0)
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);
}
}