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我正在編寫一個程序來幫助跟蹤員工座位，但是，我很難將Java Swing GUI捕獲的用戶信息打印到Excel表單上。我使用apache POI來編寫excel。如何將通過Java Swing GUI輸入的用戶信息輸出到Excel表格中？
該程序正確地遍歷Excel表格中的行，但它似乎刪除應該在第一行的數據，一旦用戶想要繼續輸入更多信息。如果用戶只輸入一次信息（服務檯號碼，員工姓名和該服務檯的員工數量），則按JButton「添加到列表」，它會按照預期的方式在第一行上打印信息。如果用戶多次輸入信息，它會增加按下「添加到列表」按鈕的次數，但只會打印出用戶輸入的最後一個輸入，而將其他以前的信息實例寫入到Excel行中爲空。
這是計數器增量方式的問題嗎？或者它是需要調整的文本框？我爲這麼長的帖子道歉，但我正在教自己如何用java編程，這個問題一直困擾着我。
這是到目前爲止我的代碼：
import java.awt.EventQueue;
import java.awt.Window;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.*;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import java.io.*;
import javax.swing.DropMode;
public class userMenu {
private JFrame frmUtilizationSeatingReport; //JFrame being used
private JTextField txtDeskNum; //Text box that will hold the desk number
private JTextField txtEmployeeName; //Text box for employee name
private JTextField txtNumAtDesk; //Text box for the number of employees at that desk
public int rownum = 1; //My counter being used to increment the row in which input is being stored in
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
userMenu window = new userMenu();
window.frmUtilizationSeatingReport.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public userMenu() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmUtilizationSeatingReport = new JFrame();
frmUtilizationSeatingReport.setTitle("Utilization Seating Report Program");
frmUtilizationSeatingReport.setBounds(100, 100, 436, 210);
frmUtilizationSeatingReport.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmUtilizationSeatingReport.getContentPane().setLayout(null);
JLabel lblDeskNumber = new JLabel("Desk Number:");
lblDeskNumber.setBounds(20, 11, 163, 21);
frmUtilizationSeatingReport.getContentPane().add(lblDeskNumber);
txtDeskNum = new JTextField();
txtDeskNum.setBounds(42, 30, 121, 20);
frmUtilizationSeatingReport.getContentPane().add(txtDeskNum);
txtDeskNum.setColumns(10);
JLabel lblEmployeeName = new JLabel("Employee Name:");
lblEmployeeName.setBounds(20, 55, 163, 21);
frmUtilizationSeatingReport.getContentPane().add(lblEmployeeName);
txtEmployeeName = new JTextField();
txtEmployeeName.setBounds(42, 73, 121, 20);
frmUtilizationSeatingReport.getContentPane().add(txtEmployeeName);
txtEmployeeName.setColumns(10);
JLabel lblNumberOfEmployees = new JLabel("Number of Employees at Desk:");
lblNumberOfEmployees.setBounds(20, 96, 281, 21);
frmUtilizationSeatingReport.getContentPane().add(lblNumberOfEmployees);
txtNumAtDesk = new JTextField();
txtNumAtDesk.setBounds(42, 115, 121, 20);
frmUtilizationSeatingReport.getContentPane().add(txtNumAtDesk);
txtNumAtDesk.setColumns(10);
JButton btnAdd = new JButton("Add To List");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent b) {
String deskNumber = ""; //Will take the desk number in as a string
int empsAtDesk = 0; //The number of employees at the desk as an int
String employeeName = ""; //Employee Name
boolean keepRunning = true;
deskNumber = txtDeskNum.getText();
empsAtDesk = Integer.parseInt(txtNumAtDesk.getText());
employeeName = txtEmployeeName.getText();
//Blank workbook
HSSFWorkbook workbook = new HSSFWorkbook();
//Blank sheet
HSSFSheet sheet = workbook.createSheet("Seating Details");
//create heading
Row rowHeading = sheet.createRow(0);
rowHeading.createCell(0).setCellValue("Desk:");
rowHeading.createCell(1).setCellValue("Employee(s)Name:");
rowHeading.createCell(2).setCellValue("Number At Desk:");
//Create 'total' headings
Row rowtotal = sheet.createRow(71);
rowtotal.createCell(0).setCellValue("Total:");
CellStyle stylerowtotal = workbook.createCellStyle();
Font totalfonts = workbook.createFont();
totalfonts.setBold(true);
totalfonts.setFontName(HSSFFont.FONT_ARIAL);
totalfonts.setFontHeightInPoints((short) 11);
stylerowtotal.setFont(totalfonts);
stylerowtotal.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowtotal.getCell(0).setCellStyle(stylerowtotal);
Row rowpercent = sheet.createRow(72);
rowpercent.createCell(0).setCellValue("Total %/Day:");
stylerowtotal = workbook.createCellStyle();
totalfonts = workbook.createFont();
totalfonts.setBold(true);
totalfonts.setFontName(HSSFFont.FONT_ARIAL);
totalfonts.setFontHeightInPoints((short) 11);
stylerowtotal.setFont(totalfonts);
stylerowtotal.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowpercent.getCell(0).setCellStyle(stylerowtotal);
Row percentMTh = sheet.createRow(73);
percentMTh.createCell(0).setCellValue("Total %/Week M-Th:");
stylerowtotal = workbook.createCellStyle();
totalfonts = workbook.createFont();
totalfonts.setBold(true);
totalfonts.setFontName(HSSFFont.FONT_ARIAL);
totalfonts.setFontHeightInPoints((short) 11);
stylerowtotal.setFont(totalfonts);
stylerowtotal.setVerticalAlignment(CellStyle.ALIGN_CENTER);
percentMTh.getCell(0).setCellStyle(stylerowtotal);
Row percentMFri = sheet.createRow(74);
percentMFri.createCell(0).setCellValue("Total %/Week M-F:");
stylerowtotal = workbook.createCellStyle();
totalfonts = workbook.createFont();
totalfonts.setBold(true);
totalfonts.setFontName(HSSFFont.FONT_ARIAL);
totalfonts.setFontHeightInPoints((short) 11);
stylerowtotal.setFont(totalfonts);
stylerowtotal.setVerticalAlignment(CellStyle.ALIGN_CENTER);
percentMFri.getCell(0).setCellStyle(stylerowtotal);
Row seatsAvai = sheet.createRow(75);
seatsAvai.createCell(0).setCellValue("Total Seats Available:");
stylerowtotal = workbook.createCellStyle();
totalfonts = workbook.createFont();
totalfonts.setBold(true);
totalfonts.setFontName(HSSFFont.FONT_ARIAL);
totalfonts.setFontHeightInPoints((short) 11);
stylerowtotal.setFont(totalfonts);
stylerowtotal.setVerticalAlignment(CellStyle.ALIGN_CENTER);
seatsAvai.getCell(0).setCellStyle(stylerowtotal);
//Create Cell Formulas
//Total number of employees at a desk cell formula
rowtotal.createCell(2).setCellFormula("SUM(C2:C71)");
//Total percentage for the day
rowpercent.createCell(2).setCellFormula("(SUM(C2:C71)/78) * 100");
//Font size and style loop for my headers
for(int i = 0; i < 3; i++)
{
CellStyle stylerowHeading = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBold(true);
font.setFontName(HSSFFont.FONT_ARIAL);
font.setFontHeightInPoints((short) 11);
stylerowHeading.setFont(font);
stylerowHeading.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowHeading.getCell(i).setCellStyle(stylerowHeading);
}
//This data needs to be written (Object[])
Map <String, Object[]> data = new TreeMap<String, Object[]>();
data.put("5", new Object[] {deskNumber, employeeName, empsAtDesk});
if(keepRunning){
//Iterate over data and write to sheet
Set<String> keyset = data.keySet();
for(String Key : keyset)
{
Row row = sheet.createRow(rownum++);
Object [] objArr = data.get(Key);
int cellnum = 0;
for(Object obj : objArr)
{
Cell cell = row.createCell(cellnum++);
if(obj instanceof String)
{
cell.setCellValue((String)obj);
}
else if(obj instanceof Integer)
{
cell.setCellValue((Integer)obj);
}
}
//Auto size my columns that will be filled out with user input info.
for (int i = 0; i < 3; i++)
{
sheet.autoSizeColumn(i);
}
} //top for loop brace
try{
//save to excel file
FileOutputStream out = new FileOutputStream(new File("Employee Seating Report.xls"));
workbook.write(out);
out.flush();
out.close();
workbook.close();
System.out.println("Excel Written Succesfully..." + '\n');
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1){
e1.printStackTrace();
} catch (Exception e1) {
System.out.println(e1.getMessage());
}
//Empty text fields once user presses "Add To List" button
txtDeskNum.setText("");
txtEmployeeName.setText("");
txtNumAtDesk.setText("");
}//If statement end brace
}//Public void end brace
});
btnAdd.setBounds(214, 42, 129, 23);
frmUtilizationSeatingReport.getContentPane().add(btnAdd);
JButton btnExit = new JButton("End Program");
btnExit.addActionListener(new ActionListener() {
//If the user presses the"End Program" button, close the program.
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnExit.setBounds(214, 95, 129, 23);
frmUtilizationSeatingReport.getContentPane().add(btnExit);
}
}
謝謝！我會嘗試這種方法。 – Mel