Sending Email with Attachment using Apex & Visualforce page

Apex Class:

 Public with sharing class SendemailController{  
 public String caseId {get;set;}  
 Public SendemailController(){  
 caseId = ApexPages.currentPage().getParameters().get(‘Id’);  
 }  
 Public Pagereference sendEmailFunction(){  
 Case getEmail = [SELECT Id, Contact.Email FROM Case WHERE id=:caseId];  
 if(getEmail.Contact.Email != null) {  
 String toaddress = getEmail.Contact.Email;  
 try {  
 Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();  
 String[] toAddresses = new String[] {toaddress};  
 String[] ccAddresses = new String[] {‘test@gmail.com’};  
 mail.setToAddresses(toAddresses);  
 mail.setCcAddresses(ccAddresses);  
 mail.setReplyTo(toaddress);  
 mail.setSenderDisplayName(‘Name’);  
 mail.setSubject(‘Testing email through apex’);  
 mail.setBccSender(false);  
 mail.setUseSignature(true);  
 mail.setPlainTextBody(‘This is test email body. This mail is being sent from apex code’);  
 //mail.setHtmlBody(‘<b> This is HTML body </b>’ );  
 List<Messaging.Emailfileattachment> fileAttachments = new List<Messaging.Emailfileattachment>();  
 for (Attachment a : [select Name, Body, BodyLength from Attachment where ParentId = :caseId]){  
 Messaging.Emailfileattachment efa = new Messaging.Emailfileattachment();  
 efa.setFileName(a.Name);  
 efa.setBody(a.Body);  
 fileAttachments.add(efa);  
 //mail.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});  
 }  
 mail.setFileAttachments(fileAttachments);  
 Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });  
 } catch(Exception e) {}  
 }  
 PageReference reference = new PageReference(‘http://new-developer-edition.ap1.force.com/ThankYou?caseId=’+caseId);  
 reference.setRedirect(true);  
 return reference;  
 }  
 }  

VI Page:

 <apex:page controller=”SendemailController”>  
 <apex:form >  
 <script type=”text/javascript”>  
 function init() {  
 sendEmail();  
 }  
 if(window.addEventListener)  
 window.addEventListener(‘load’,init,true)  
 else  
 window.attachEvent(‘onload’,init)  
 </script>  
 <apex:actionFunction name=”sendEmail” action=”{!sendEmailFunction}”>  
 </apex:actionFunction>  
 </apex:form>  
 </apex:page>