CSV Reader in Apex

CsvReader.apxc

public class CsvReader {
    public static void readCsv(String fName){
        if(fname != NULL){
            try{
                StaticResource sr = [select id, body from StaticResource where name=: fName];
                
                Lead lobj;
                List<Lead> lLead = new List<lead>();
                if(sr.body != NULL){
                    String sCSV = sr.body.toString();
                    List<String> lstFieldNames = new List<String>();
                    List<String> dataLines = sCSV.split('\\n');
                    Map <String, Integer> fieldNumberMap = new Map < String, Integer > ();
                    
                    string[] csvFieldNames = dataLines[0].split(',');
                    for (Integer i = 0; i < csvFieldNames.size(); i++) {
                        fieldNumberMap.put(csvFieldNames[i], i);
                        lstFieldNames.add(csvFieldNames[i].trim());
                    }
                    
                    system.debug('dataLines ' +dataLines);
                    
                    for (Integer i = 1; i < dataLines.size(); i++) {
                        lobj = new Lead();
                        string[] csvRecordData = dataLines[i].split(',');
                        for (String fieldName: csvFieldNames) {
                            Integer fieldNumber = fieldNumberMap.get(fieldName);
                            String fieldValue = csvRecordData[fieldNumber];
                            lobj.put(fieldName.trim(), fieldValue.trim());
                        }
                        lLead.add(lobj);                
                    }
                }
                
                if(lLead.size() > 0 ){
                    insert lLead;
                }
            }
            catch(QueryException qe){
                System.debug('QE: '+ qe);
            }
            catch(Exception e){
                System.debug('EE: '  + e);
            }
        
        }
    }
}

Lead_csvReader.csv

To execute the same-
CsvReader.readCsv('Lead_csvReader');