Report Controller with Report

ReportController.apxc

public class ReportController{
    
    //Generate report Based on parameter
    public void generateReport(string reportDevName)
    {
        try
        {
            List <Report> reportList = [SELECT Id,DeveloperName,Name FROM Report where DeveloperName =:reportDevName];
            if(reportList.size()>0)
            {
                String reportId = (String)reportList.get(0).get('Id');
                
                //Get Report Name
                string reportName=(String)reportList.get(0).get('Name');
                
                //get instance Url
                String instanceName = URL.getSalesforceBaseUrl().toExternalForm();
                
                string url=instanceName+'/servlet/PrintableViewDownloadServlet?isdtp=p1&reportId='+reportId;
                
                ApexPages.PageReference objPage = new ApexPages.PageReference(url);
                Messaging.SingleEmailMessage email=new Messaging.SingleEmailMessage();
                
                Messaging.EmailFileAttachment objMsgEmailAttach = new Messaging.EmailFileAttachment();
                objMsgEmailAttach.setFileName(reportName+'.csv');
                objMsgEmailAttach.setBody(objPage.getContent());
                objMsgEmailAttach.setContentType('text/csv');
                email.setSubject(reportName);
                
                List<Messaging.EmailFileAttachment> attach=new List<Messaging.EmailFileAttachment>();
                attach.add(objMsgEmailAttach);
                email.setFileAttachments(attach);  
                
                EmailService service=new EmailService(email);
                service.body='Hello, <br/><br/> Here is attached '+reportName+'.<br/><br/>Thank You.<br/>Admin';
                service.isHtml=true;
                service.toAddresses=new List<string>();
                service.toAddresses.add('contactus@salesforcecodex.com');  
                service.toAddresses.add('dhanik.sahni@yahoo.com');  
                service.displayName='Salesforce Codex';
                service.subject=reportName;
                service.sendMail();
            }
        }
        catch(Exception ex)
        {
            system.debug(ex.getMessage());
        }
    }
  
}