[英]how to write dynamic excel file (number of column can exceed) into java objects using apache poi
I understand that we can create model class whose each instance variable will be bound to each excel column like below 我知道我们可以创建模型类,其每个实例变量都将绑定到每个excel列,如下所示
class emp{
String name;
String empId;
//getter and setter method of each
}
abc | abc | 123
123
bcd | bcd | 3232
3232
xyz | xyz | ee32
EE32
how to handle this case when number of column in excel increases dynamically 当excel中的列数动态增加时如何处理这种情况
I would doing this using a kind of table model. 我将使用一种表模型来执行此操作。 A
ExcelTableModel
similar to the javax.swing.table.DefaultTableModel . 一个类似于javax.swing.table.DefaultTableModel的
ExcelTableModel
。
Complete example showing a blueprint of this approach: 显示此方法蓝图的完整示例:
import java.io.*;
import org.apache.poi.ss.usermodel.*;
public class UseExcelTableModel {
public static void main(String[] args) throws Exception {
Workbook workbook = WorkbookFactory.create(new FileInputStream("ExcelFile.xlsx"));
Sheet sheet = workbook.getSheetAt(0);
ExcelTableModel excelTableModel = new ExcelTableModel(sheet);
System.out.println(excelTableModel.getColumnCount());
System.out.println(excelTableModel.getRowCount());
System.out.println(excelTableModel.getColumnNames());
System.out.println(excelTableModel.getData());
System.out.println(excelTableModel.getColumnName(1));
System.out.println(excelTableModel.getValueAt(2, 1));
workbook.close();
}
}
import java.util.Vector;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
public class ExcelTableModel {
private Vector<String> columnNames;
private Vector<Vector<String>> data;
private DataFormatter dataFormatter = new DataFormatter();
public ExcelTableModel(Sheet sheet) {
this.columnNames = new Vector<String>();
this.data = new Vector<Vector<String>>();
int firstRow = sheet.getFirstRowNum();
Row colNamesRow = sheet.getRow(firstRow);
int firstCol = colNamesRow.getFirstCellNum();
int lastColP1 = colNamesRow.getLastCellNum();
for (int c = firstCol; c < lastColP1; c++) {
Cell cell = colNamesRow.getCell(c);
String columnName = dataFormatter.formatCellValue(cell);
this.columnNames.add(columnName);
}
int lastRow = sheet.getLastRowNum();
for (int r = firstRow + 1; r < lastRow + 1; r++) {
Vector<String> cells = new Vector<String>();
Row row = sheet.getRow(r);
if (row == null) {
row = sheet.createRow(r);
}
for (int c = firstCol; c < lastColP1; c++) {
Cell cell = row.getCell(c);
String cellValue = dataFormatter.formatCellValue(cell);
cells.add(cellValue);
}
this.data.add(cells);
}
}
public int getColumnCount() {
return this.columnNames.size();
}
public int getRowCount() {
return this.data.size();
}
public String getColumnName(int columnIndex) {
return this.columnNames.get(columnIndex);
}
public String getValueAt(int rowIndex, int columnIndex) {
return this.data.get(rowIndex).get(columnIndex);
}
public Vector getColumnNames() {
return this.columnNames;
}
public Vector getData() {
return this.data;
}
// More getters and setters...
}
The first sheet in ExcelFile.xlsx
can be something like this: ExcelFile.xlsx
的第一张表可以是这样的:
As you see, the table will be got from the used range and the first row of the used range will be got as column names. 如您所见,该表将从使用的范围获得,而使用的范围的第一行将作为列名获得。
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