import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;
public class ExcelToJson {
public static void main(String\[\] args) {
String excelFilePath = "zzz.xlsx";
Map<String, JSONArray> dataMap = new HashMap<>();
try (FileInputStream fis = new FileInputStream(excelFilePath);
Workbook workbook = new XSSFWorkbook(fis)) {
Sheet sheet = workbook.getSheetAt(1);
Row headerRow = sheet.getRow(0);
for (Row row : sheet) {
if (row.getRowNum() == 0) {
continue; //Policy.RETURN_BLANK_AS_NULL);
}
Cell keyCell = row.getCell(0, Row.MissingCellPolicy.RETURN_BLANK_AS_NULL);
if (keyCell == null) {
continue; // Skip rows where the key cell is empty
}
String key = getCellValue(keyCell).toString();
JSONArray jsonArray = dataMap.getOrDefault(key, new JSONArray());
JSONObject jsonObject = new JSONObject();
for (int cn = 1; cn < row.getLastCellNum(); cn++) {
Cell cell = row.getCell(cn, Row.MissingCellPolicy.RETURN_BLANK_AS_NULL);
if (cell != null) {
String header = headerRow.getCell(cn).getStringCellValue();
jsonObject.put(header, getCellValue(cell));
}
}
jsonArray.put(jsonObject);
dataMap.put(key, jsonArray);
}
// Print the JSON output
dataMap.forEach((key, value) -> System.out.println(key + ": " + value.toString()));
} catch (Exception e) {
e.printStackTrace();
}
}
private static Object getCellValue(Cell cell) {
switch (cell.getCellType()) {
case STRING:
return cell.getStringCellValue();
case NUMERIC:
return cell.getNumericCellValue();
case BOOLEAN:
return cell.getBooleanCellValue();
default:
return "";
}
}
}