我正在编写一个程序,我可以在其中将人员的详细信息添加到 Excel 工作表中。我还必须能够编辑这些详细信息,因此我想做的是删除旧的详细信息,然后将新的详细信息写入文件。每个人的所有详细信息都存储在一行中。我希望能够通过使用正在更改的人的电子邮件来定位每一行。我怎样才能做到这一点?我已经尝试过我发现的其他人的解决方案,但它们不适用于我的程序。 Belo 是我的程序的基本版本,可帮助您理解:
下面的代码是我将人员的详细信息写入文件的地方。这一切都很好。
JButton addClientButton = new JButton("Add");
addClientButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
PrintWriter pw = null;
Client newClient = new Client(firstNameTextField.getText(), lastNameTextField.getText(), emailTextField.getText(), phoneTextField.getText(), weightTextField.getText(), heightTextField.getText(), ageSpinner.getValue(), activityLevelComboBox.getSelectedItem());
try {
pw = new PrintWriter(new FileOutputStream(new File("Clients.csv"), true));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
StringBuilder sb = new StringBuilder();
sb.append(newClient.getFirst());
sb.append(",");
sb.append(newClient.getLast());
sb.append(",");
sb.append(newClient.getEmail());
sb.append(",");
sb.append(newClient.getPhone());
sb.append(",");
sb.append(newClient.getWeight());
sb.append(",");
sb.append(newClient.getHeight());
sb.append(",");
sb.append(newClient.getClientAge());
sb.append(",");
sb.append(newClient.getClientActivity());
sb.append("\n");
pw.write(sb.toString());
pw.close();
}
});
下面是代码的开头,我必须能够使用存储在“editClient”对象中的新编辑的详细信息来替换旧的详细信息。
JButton btnSave1 = new JButton("Save");
btnSave1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Client editClient = new Client(firstNameField1.getText(), lastNameField1.getText(), emailField1.getText(), phoneField1.getText(), weightField1.getText(), heightField1.getText(), ageSpinner1.getValue(), activityComboBox1.getSelectedItem());
}
});
最佳答案
可以使用Apache POI lib,可以下载here .
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
public class Operations {
private static final String FILE_NAME = "MyFirstExcel.xls";
public static void main(String[] args) {
//ArrayList<String> eMails = new ArrayList<String>();
//int cellIndex = 0;
try {
FileInputStream excelFile = new FileInputStream(new File(FILE_NAME));
Workbook workbook = new HSSFWorkbook(excelFile);
Sheet datatypeSheet = workbook.getSheetAt(0);
Iterator<Row> iterator = datatypeSheet.iterator();
//for (String eMail : eMails) {
while (iterator.hasNext()) {
Row currentRow = iterator.next();
Iterator<Cell> cellIterator = currentRow.iterator();
//while (cellIterator.hasNext()) {
if (currentRow.getCell(2).getCellTypeEnum() == CellType.STRING) {
// control your email, I presume email stays in the 3rd cell
if (currentRow.getCell(2).getStringCellValue().compareTo(editClient.getEmail()) != 0) {
continue;
}
}
//Cell currentCell = cellIterator.next();
// your code here..
currentRow.getCell(0).setCellValue(editClient.getFirst());
currentRow.getCell(1).setCellValue(editClient.getLast());
//..
//currentCell.setCellValue(editClient.getFirst());
//}
}
//}
// update
// after refreshin your datatypeSheet objet you should write back to file
FileOutputStream outputStream = new FileOutputStream(FILE_NAME);
workbook.write(outputStream);
workbook.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Here另一个有用的话题。
关于java - 如何使用 Java 删除 Excel (csv) 工作表中的一行?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45399608/