Class YoilTellerMVC4

ch2/YoilTellerMVC4.java:10–64

import org.springframework.web.servlet.ModelAndView;

@Controller
public class YoilTellerMVC4 {
    @RequestMapping("/getYoilMVC4") // http://localhost/ch2/getYoilMVC4?year=2021&month=10&day=1
    public ModelAndView main(MyDate date) { // 반환 타입이 ModelAndView 
System.out.println("date="+date);

    	// 1. ModelAndView를 생성
    	ModelAndView mv = new ModelAndView(); 
    	
    	// 2. 유효성 검사 
    	if(!isValid(date)) {
            mv.setViewName("yoilError"); // 뷰의 이름을 지정 
    	    return mv;
        }
    	
        // 3. 처리
    	char yoil = getYoil(date);

    	// 4. ModelAndView에 작업한 결과를 저장 
      	//mv.addObject("year",  date.getYear());     	
      	//mv.addObject("month", date.getMonth());     	
      	//mv.addObject("day",   date.getDay());
        mv.addObject("myDate", date);
      	mv.addObject("yoil", yoil);        
        
      	// 5. 작업 결과를 보여줄 뷰의 이름을 지정 
      	mv.setViewName("yoil"); 
      	
      	// 6. ModelAndView를 반환
      	return mv;
    }

    private char getYoil(MyDate date) {
        return getYoil(date.getYear(), date.getMonth(), date.getDay());
    }
    
    private char getYoil(int year, int month, int day) {
        Calendar cal = Calendar.getInstance();
        cal.set(year, month - 1, day);

        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
        return " 일월화수목금토".charAt(dayOfWeek);
    }
    
    private boolean isValid(MyDate date) {
        return isValid(date.getYear(), date.getMonth(), date.getDay());
    }
    
    private boolean isValid(int year, int month, int day) {    
    	if(year==-1 || month==-1 || day==-1) 
    		return false;
    	
    	return (1<=month && month<=12) && (1<=day && day<=31); // 간단히 체크 
    }
}