To parse CSV to sObject using Apex in Salesforce, use the below link to get the code

http://wiki.developerforce.com/page/Code_Samples#Parse_a_CSV_with_APEX

Sample code:

public List<List<String>> parseCSV(String contents,Boolean skipHeaders) {    
 
     List<List<String>> allFields = new List<List<String>>();      
     // replace instances where a double quote begins a field containing a comma  
     // in this case you get a double quote followed by a doubled double quote    
     // do this for beginning and end of a field    
 
     contents = contents.replaceAll(',"""',',"DBLQT').replaceall('""",','DBLQT",');    
 
     // now replace all remaining double quotes - we do this so that we can reconstruct
     // fields with commas inside assuming they begin and end with a double quote     
 
     contents = contents.replaceAll('""','DBLQT');    
 
     // we are not attempting to handle fields with a newline inside of them  
     // so, split on newline to get the spreadsheet rows     
 
     List<String> lines = new List<String>();      
 
     try {    
 
         lines = contents.split('\n');    
 
     }  catch (System.ListException e) {    
 
         System.debug('Limits exceeded?' + e.getMessage());    
 
     }     
 
     Integer num = 0;      
 
     for(String line : lines) {    
 
         // check for blank CSV lines (only commas)      
 
         if (line.replaceAll(',','').trim().length() == 0) break;               
 
         List<String> fields = line.split(',');          
         List<String> cleanFields = new List<String>();    
         String compositeField;  
         Boolean makeCompositeField = false;    
 
 
         for ( String field : fields ) {    
 
             if (field.startsWith('"') && field.endsWith('"')) {    
 
                 cleanFields.add(field.replaceAll('DBLQT','"'));    
 
             } else if (field.startsWith('"')) {    
 
                 makeCompositeField = true;  
                 compositeField = field;    
 
             } else if (field.endsWith('"')) {    
 
                 compositeField += ',' + field;    
                 cleanFields.add(compositeField.replaceAll('DBLQT','"'));    
                 makeCompositeField = false;    
 
 
             } else if (makeCompositeField) {    
 
                 compositeField +=  ',' + field;    
 
             } else {    
 
                 cleanFields.add(field.replaceAll('DBLQT','"'));    
 
             }    
 
         }              
 
         allFields.add(cleanFields);    
 
     }    
 
     if (skipHeaders) allFields.remove(0);      
 
     return allFields;          
 
}  

 Here contents is fileContent.toString(). Where fileContent is the value of file mentioned in <apex:inputFile.>

Example:

<apex:inputFile value = "{!fileContent}" name = "{!fileName}"/>