Java - รบกวนสอบถามโค้ดการอ่านไฟล์.csv แล้วนำค่ามาเช็คในฐานข้อมูล และทำการ update หรือ insert คะ

public class TerminateCSVManager {

	private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd", Locale.US);
	public Map getUser(String server,String username,String password,String filePath){
		Map map =new HashMap<String,User>();
		 FTPClient ftp = new FTPClient();
	        try {
	        	//ftp.connect("57.59.2.187");
	        	ftp.connect(server); 
				//if (!ftp.login("patcels", "P@tcEl$5"))
	        	if (!ftp.login(username,password))
				{
				    ftp.logout(); 
				}
				ftp.setFileType(FTP.BINARY_FILE_TYPE); 
				FTPFile[] files = ftp.listFiles(filePath);
	             //System.out.println(files);
	             String filenameMax="";
	        	 Date timesMax=null;
	        	 boolean haveFiles=false;
	        	 boolean firstTime=false;
	             if(files!=null && files.length>0){
	            	 int size=files.length;
	            	 Date[] times=new Date[size];
	            	 String[] name=new String[size];            	
	            	 for (int i = 0; i < size; i++) {
	            		 FTPFile file =files[i];
	            		 times[i]=file.getTimestamp().getTime();
	            		 name[i]=file.getName();
	            		 if(name[i].indexOf(".csv")!=-1){
	            			 String[] filename=name[i].split(".csv");
	            			 Date d=null;
	            			 try {
								d=dateFormat.parse(filename[0]);
							} catch (ParseException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							}
	            			 if(!firstTime){
	            				 timesMax=d;// times[i];
	                			 filenameMax=name[i];
	                			 firstTime=true;
	            			 }else{
	            				 if(d.after(timesMax)){
	                				 timesMax=d;
	                				 filenameMax=name[i];
	                			 }
	            			 }
	            				 
	            		 } 
	            		 
					}
	            	 haveFiles=true;
	             }
	             if(haveFiles && filenameMax!=null && filenameMax.length()>0){
		CSVReader reader=null;
		InputStreamReader inReader=null;
		try {
			System.out.println("filePath & filename=="+(filePath+filenameMax));
			inReader=new  InputStreamReader(ftp.retrieveFileStream(filePath+filenameMax));
			reader= new CSVReader(inReader, ',');
			String [] nextLine;
			try {
				while ((nextLine = reader.readNext()) != null) {
					User User =new User();
					String id =nextLine[0];
						
					}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} 
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(inReader!=null){
				inReader.close();
			}
			if(reader!=null){
				try {
					reader.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	  } ftp.noop(); // check that control connection is working OK

      ftp.logout();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} finally
 {
     if (ftp.isConnected())
     {
         try
         {
             ftp.disconnect();
         }
         catch (IOException f)
         {
             // do nothing
         }
     }
 }	
		
		return map;
	}
	
	public static void main(String[] args) throws IOException {
		
			PaeManager a = new  PaeManager();
			Map map =a.getPaeMap("57.59.2.187","patcels","P@tcEl$5","/Terminated/");
		
			ArrayList<String> Usename = new ArrayList<String>(map.values());
			
			Usename = printMap(map);
	        System.out.println("Size of Value list from Usename: " + Usename.size());

	        for(int i = 0;i<Usename.size();i++){	
	        	System.out.println("Usename : "+Usename.get(i));
	        }
	}

	
	public static ArrayList<String> printMap(Map mp) {
	    Iterator it = mp.entrySet().iterator();
        ArrayList<String> Usename = new ArrayList<String>();
     
	    while (it.hasNext()) {
	        Map.Entry pairs = (Map.Entry)it.next();
	      
	        Usename.add(pairs.getKey().toString());
	        it.remove(); 
	        
	    }
	    return Usename;
	 
	}

	  
}