I`m have build below visualforce page which allows our portal users to send emails. Page works fine, however now I want to add a functionality to allow users to upload the attachment and send with email. I have went through lot of resources online but cant find the solution. Can someone please help?

 

public class sendEmailStdCon {

    private final Case c;

    //Case fields
     public String Caseno { get; set; }
     public String CaseRecType { get; set; }
     public String CaseStatus { get; set; }
     public String CaseSubject { get; set; }
    public string threadID { get; set; }
    public string refNumber   { get; set; }

    public String subject { get; set; }
    public String body { get; set; }
    public String addresses { get; set; }
    public String BodyofEmail { get; set; }
    public String BccAddress { get; set; }
    public String ccAddress { get; set; }
    public String ToAddress { get; set; }


    public   String orgEmails {get;set;}



    datetime currenttime =  System.now();

    public sendEmailStdCon(ApexPages.StandardController controller) {

        Case c = [SELECT id, CaseNumber,Status ,Subject, Email_Case_Ref__c , RecordType.Name from Case where id = :ApexPages.currentPage().getParameters().get('id')];

            Caseno = c.CaseNumber;
         CaseRecType = c.RecordType.Name;
            CaseStatus = c.Status;
            CaseSubject = C.Subject;
           refNumber = c.Email_Case_Ref__c;     

        EmailMessage e = [ SELECT id, FromName,CcAddress, BccAddress,ToAddress , Subject, TextBody, FromAddress from EmailMessage WHERE 
                          ParentId = :ApexPages.currentPage().getParameters().get('id')  ORDER BY MessageDate DESC Limit 1  ];



        BodyofEmail = e.TextBody;
        Subject = e.Subject;
        BccAddress =  Userinfo.getUserEmail();
        ccAddress = e.CcAddress;
        addresses = e.FromAddress; 
        ToAddress = e.ToAddress;
    }







    public Case getCase() {
        return c;
    }

    public PageReference send() {

                  system.debug('orgEmails: ' + orgEmails);


      OrgWideEmailAddress[] owea = [select Id from OrgWideEmailAddress where Address = :orgEmails];


        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 



        String[] toAddresses = ToAddress.split(';', 0);

        // Sets the paramaters of the email
        email.setSubject( subject + ' ' + refNumber);
        email.setToAddresses( toAddresses );

        if (ccAddress != null && ccAddress.trim() != '' ) {
        String[] cccAddresses =ccAddress.split(';', 0);
        email.setCcAddresses( cccAddresses );
            }

        email.setPlainTextBody( BodyofEmail );



                if (BccAddress != null && BccAddress.trim() != '' ) {
        String[] BccAddresses =BccAddress.split(';', 0);
        email.setCcAddresses( BccAddresses );
            }


        if ( owea.size() > 0 ) {
        email.setOrgWideEmailAddressId(owea.get(0).Id);
        }



        // Sends the email
        Messaging.SendEmailResult [] r = 
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});   


             //   EmailMessage E = New EmailMessage () ;
            //  e.


        return null;
    }
}

VF:

<apex:page standardcontroller="Case" extensions="sendEmailStdCon">


    <apex:messages />
    <apex:pageBlock title="Send an Email to Your Representatives">
        <p>Fill out information below and click on "Send" button send an email.</p>
        <br />
        <apex:pageBlockSection columns="2"> 
            <apex:outputText label="Case Number" value="{!Caseno}"> </apex:outputText>
            <apex:outputText label="Case Record Type" value="{!CaseRecType}"> </apex:outputText>
            <apex:outputText label="Status" value="{!CaseStatus}"> </apex:outputText>
            <apex:outputText label="Subject" value="{!CaseSubject}"> </apex:outputText>

        </apex:pageBlockSection>

        <apex:form >


            <br /><br />

            <apex:outputLabel value="To" for="To"/>:<br />     
            <apex:inputText value="{!ToAddress}" id="to" maxlength="500" style="width: 500px;" />
            <br /><br />

            <apex:outputLabel value="CC" for="CC"/>:<br />     
            <apex:inputText value="{!ccAddress}" id="cc" maxlength="500" style="width: 500px;" />
            <br /><br />

            <apex:outputLabel value="Bcc" for="Bcc"/>:<br />     
            <apex:inputText value="{!Bccaddress}" id="Bcc" maxlength="500" style="width: 500px;"  />
            <br /><br />


            <apex:outputLabel value="Subject" for="Subject"/>:<br />     
            <apex:inputText value="{!subject}" id="Subject" maxlength="500" style="width: 500px;" />
            <br /><br />


            <apex:outputLabel value="Body" for="Body"/>:<br />     
            <apex:inputTextarea value="{!BodyofEmail}" id="Body"  rows="10" cols="80" style="width:550px;height:500px"   />           
            <br /><br /><br />
            <apex:commandButton value="Send Email" action="{!send}" /> 
        </apex:form>
    </apex:pageBlock>
</apex:page>

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