How to read excel(.xlsx) in java using poi?

Question

I am trying to read excel in java.I have following code.

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.         


        

Answer 1

Use this : Input String filePath Output is list of list of json objects

Have these dependencies
    
        org.apache.poi
        poi-ooxml
        3.9
    
    
        org.apache.commons
        commons-collections4
        4.0
    


/**
 * Function reads the input excel and gives list(sheet) of objects(rows of each sheet)
 * @param filePath
 * @return list of list of json objects
 */
public static List excelFileReader(String filePath){

    ListtotalSheetList=new ArrayList<>();
    XSSFWorkbook workbook= null;
    try {
        workbook = new XSSFWorkbook(filePath);
    } catch (IOException e) {
        e.printStackTrace();
    }

    //iteration for sheets in a workbook
    for(int sheetIndex=0;sheetIndex singleSheetList=new ArrayList<>();

        //excel header - first row and non-empty
        String[] header=new String[sheet.getRow(0).getPhysicalNumberOfCells()];
        if (sheet.getPhysicalNumberOfRows()!=0 && sheet.getRow(0).getRowNum()==0) {
            row=sheet.getRow(0);
            for(int index=0;index eachRow=new HashMap<>();
                for(int colIndex=0;colIndex