Hi Mahi,

You can use CSV parser for this..plese refer the below example code where I have created one Visualforce page from where I am uplaoding the excel file .csv and extracting the records data and mapping with object columns

please check and let me know if it helps you

page:

<apex:page sidebar="false" controller="UploadOpportunityScheduleLineItem">
    <apex:form >
        <apex:sectionHeader title="Upload data from CSV file"/>
          <apex:pagemessages />  
          <apex:pageBlock >
            <center>
                <apex:inputFile value="{!contentFile}" filename="{!nameFile}" />
                <apex:commandButton action="{!ReadFile}" value="Upload File" id="theButton" style="width:70px;"/>
                <br/> <br/>
            </center>  
      
      <apex:pageBlocktable value="{!mapUnmatchedSchedules}" var="mapID"  title="Unmathed Lines of CSV file">
          <apex:column headervalue="Opportunity Id">
              {!mapUnmatchedSchedules[mapID][0]}
          </apex:column>
          <apex:column headervalue="Oportunnity Name">
              {!mapUnmatchedSchedules[mapID][1]}
          </apex:column>
          <apex:column headervalue="Month">
              {!mapUnmatchedSchedules[mapID][2]}
          </apex:column>
          <apex:column headervalue="Year">
              {!mapUnmatchedSchedules[mapID][3]}
          </apex:column>
          <apex:column headervalue="Actualized Amount">
              {!mapUnmatchedSchedules[mapID][4]}
          </apex:column>
      </apex:pageBlocktable>  
          </apex:pageBlock>  
   </apex:form>   
</apex:page>


class

public with sharing class UploadOpportunityScheduleLineItem
{
    
    
    // Global variables
    public string nameFile{get;set;}
    public Blob contentFile{get;set;}
    List<Schedule__c> lstScheduleToUpdate = new List<Schedule__c>();
    public Schedule__C objSchedule{get;set;}
    //String array for taking csv data by line.
    String[] filelines = new String[]{};
    //string array for taking csv columns.
    String[] fileColumns = new String[]{};
    
    //set for storing all id's from csv.
    set<String> opptoupload{get;set;}
    //map for storing data from csv.
    public map<String,String> mapOppIDMonthYearToAccAmount{get;set;}
    public map<String, List<String>> mapUnmatchedSchedules{get;set;}  
    
       
       //Main constructor
    public UploadOpportunityScheduleLineItem()
    {
        //Initalizing required objects.
        objSchedule = new Schedule__c();
        opptoupload = new set<String>();
        mapOppIDMonthYearToAccAmount = new map<String,String>();
        mapUnmatchedSchedules  = new map<String, List<String>>();
    }
    //Method to read file content and check extension and file format.
    public Pagereference ReadFile()
    {
        //If without selecting csv file you clicked on upload it will give error message.
        if(nameFile == null)
        {
            ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.ERROR,'You should select csv file to upload');
            ApexPages.addMessage(errormsg);
            return null;
        }
        //Taking file extension.
        String extension = nameFile.substring(nameFile.lastIndexOf('.')+1);
        //Checking if file extension is .csv.
        if(extension == 'csv' ||extension == 'CSV')
        {
            nameFile=contentFile.toString();
            //Spliting by new line
            filelines = nameFile.split('\n');
            //Spliting values by (,) for checking coloumn size
            fileColumns = filelines[0].split(',');
            //If column size is 5 then only it will proceed.
            if(fileColumns.size() ==5)
            {
                for (Integer i=1;i<filelines.size();i++)
                {
                    String[] inputvalues = new String[]{};
                    inputvalues = filelines[i].split(',');
                       opptoupload.add(inputvalues[0]);
                       
                       mapOppIDMonthYearToAccAmount.put(inputvalues[0]+inputvalues[2]+inputvalues[3],inputvalues[4]);
                    mapUnmatchedSchedules.put(inputvalues[0]+inputvalues[2]+inputvalues[3],inputvalues);
                    lstScheduleToUpdate = new List<Schedule__c>();
                }
                for(Schedule__c objSchedule : [select Opportunity__r.Id ,Month__c,Year__c,
                                                                        Actualized_Amount__c from Schedule__c where
                                                                         Opportunity__c IN :opptoupload])
                {
                    String str = objSchedule.Opportunity__r.Id;
                    String str1;
                    str1 = str.substring(0, 15);
                    if(mapOppIDMonthYearToAccAmount.containsKey(str1 + objSchedule.Month__c +objSchedule.Year__c))
                    {
                        
                        objSchedule.Actualized_Amount__c = decimal.valueOf(mapOppIDMonthYearToAccAmount.get(str1 + objSchedule.Month__c +objSchedule.Year__c).trim());
                        mapUnmatchedSchedules.remove(str1 + objSchedule.Month__c +objSchedule.Year__c);
                        lstScheduleToUpdate.add(objSchedule);
                    }
                }
                //Checking if list is not empty then updating.
                if(lstScheduleToUpdate.Size()>0)
                {
                    update lstScheduleToUpdate;
                }
                ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.info,'File uploaded successfully');
                ApexPages.addMessage(errormsg);
               
                return null;
            }
            else
            {
                ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.ERROR,'There should be 5 columns in csv file');
                ApexPages.addMessage(errormsg);
                return null;
            }
            return null;
        }
        //If file is not csv type then it will give error message.
        else
        {
            ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.ERROR,'File type should be csv type');
            ApexPages.addMessage(errormsg);
            return null;
        }
    }
}
 

Also, please mark this as best answer if it solves your issue...let me know if anything else needed.