Hi,

Following VF page (UploadCSV )is used for browsing and uploading any CSV file

Select Object to import CSV Data
<apex:selectList required="true" multiselect="false" size="1" label="Type"  value="{!selectedValue}">

                   <apex:selectOptions value="{!Items}"/>

                   </apex:selectList>

          <br/>   

 Select CSV file

                  <apex:inputFile value="{!contentFile}" filename="{!nameFile}" /> &nbsp;&nbsp;<br/>

                 <apex:commandButton action="{!ReadFile}" value="Next" id="theButton" style="width:70px;"/>

Following is the VF page (Mapping) showing N number of Listboxes .

Number of list boxes on the left are equal to the number of fields (columns) in the CSV file uploaded.

                        <apex:repeat value="{!list}" rows="{!Number}" var="c">

                                 <apex:selectList multiselect="false" size="1"  style="width:200px;" value="{!selectedValue1[c]}">

                                <apex:selectOptions value="{!Header}"/>

                                </apex:selectList>

                                &nbsp;&nbsp;&nbsp;&nbsp;

                                 <apex:selectList multiselect="false" size="1"  style="width:300px;" value="{!selectedValue2[c]}" >

                                <apex:selectOptions value="{!FieldList}"/>

                                </apex:selectList>

                                <br/>

                               </apex:repeat>

                                <br/>

                     <apex:commandButton action="{!Savetoobj}" value="Save to Object" id="theBtn23" style="width:100px;"/>          

 you can take any CSV file ( for eg download and use the CSV file provided at http://support.vendhq.com/entries/21265746-Sample-CSV-file-to-upload-into-trial-account.  Just keep only 5 columns and delete the rest for simplicity)

Controller:

public with sharing class BMController {

 public string nameFile{get;set;}
    
    public string selectedValue{get;set;}
    public string[] selectedValue1{get;set;}
    public string[] selectedValue2{get;set;}
     public string selectedValue3{get;set;}
     

    public Blob contentFile{get;set;}
    List<SelectOption> options1 = new List<SelectOption>();
    List<String> stdObjectNames = new List<String>();
   
    List<SelectOption> options = new List<SelectOption>();
     List<SelectOption> fieldsName =new List<SelectOption>();
       

    String[] filelines = new String[]{};
    String[] HeaderXLS = new String[]{};

    List<Account> accstoupload;

     List<Integer> lst = new List<Integer>();
     Integer length;

/*displays 'n' times listbox i.e HeaderXLS times
     public List<Integer> getList() {
     for( Integer k = 0; k < length; k++) {

         lst.add(k);
         }
        return lst;
    }
    public Integer getNumber()
    {
    return length;
    }

/*returns all standard n custom objs of salesforce
   public List<SelectOption> getItems()

    {
    for ( Schema.SObjectType typ : Schema.getGlobalDescribe().values() ) 
    {
        String sobjName = String.valueOf(typ);
        if ( sobjName.contains('__c') || (!sobjName.contains('__c'))  ) 
        {
            stdObjectNames.add(sobjName);
            options1.add(new SelectOption(sobjName,sobjName));
           
        }
    }
    
       return options1;

     }
/*calling readfile on click on commandbutton next and inserting value in Object Account if value selected from 'Select object from csv is Account'
/* adds value in Header listbox
/*adds value in Fieldlist listbox

 
    public Pagereference ReadFile()
    {
        
        nameFile=contentFile.toString();
        filelines = nameFile.split('\n');
        accstoupload = new List<Account>();
       
         if(selectedValue == 'Account')
         {
        for (Integer i=1;i<filelines.size();i++)
        {
          
            String[] inputvalues = new String[]{};
            inputvalues = filelines[i].split(',');
             
            Account a = new Account();
            a.Name = inputvalues[0];
            a.ShippingStreet = inputvalues[1];       
            a.ShippingCity = inputvalues[2];
            a.ShippingState = inputvalues[3];
            a.ShippingPostalCode = inputvalues[4];
            a.ShippingCountry = inputvalues[5];

            accstoupload.add(a);
        }
        try{
        insert accstoupload;
        }
        catch (Exception e)
        {
            ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.ERROR,'An error has occured. Please check the template or try again later');
            ApexPages.addMessage(errormsg);
        }  
      } 
              HeaderXLS = filelines[0].split(',');      
              length = HeaderXLS.size();  
              for(Integer j=0;j<HeaderXLS.size();j++)
              {
                options.add(new SelectOption(HeaderXLS[j],HeaderXLS[j]));
                
               }
                String objName = selectedValue ;
        SObjectType objToken = Schema.getGlobalDescribe().get(objName);
        DescribeSObjectResult objDef = objToken.getDescribe();
       
        Map<String, SObjectField> fields = objDef.fields.getMap(); 
        
        Set<String> fieldSet = fields.keySet(); 
       
       for(String s:fieldSet)
        {
            SObjectField fieldToken = fields.get(s);
            DescribeFieldResult selectedField = fieldToken.getDescribe();
            System.debug('FIELD ::: '+selectedField.getName());
            fieldsName.add(new SelectOption(selectedField.getName(),selectedField.getName()));
        }
          PageReference page2 = new PageReference('/apex/Mapping');
        page2.setRedirect(false);
       
         return page2;
    }
        
  /*displays values in both listboxes             
    
    public List<SelectOption> getHeader()
       {
       
        return options;
       }
       
     
    public List<SelectOption> getFieldList(){
       
        return fieldsName;
        }
   
    }