Class RequestParamTest

ch2/RequestParamTest.java:11–106

import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class RequestParamTest {
	@RequestMapping("/requestParam")
	public String main(HttpServletRequest request) {
		String year = request.getParameter("year");
//		http://localhost/ch2/requestParam         ---->> year=null
//		http://localhost/ch2/requestParam?year=   ---->> year=""
//		http://localhost/ch2/requestParam?year    ---->> year=""
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";
	}

	@RequestMapping("/requestParam2")
//	public String main2(@RequestParam(name="year", required=false) String year) {   // 아래와 동일 
	public String main2(String year) {   
//		http://localhost/ch2/requestParam2         ---->> year=null
//		http://localhost/ch2/requestParam2?year    ---->> year=""
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";
	}

	@RequestMapping("/requestParam3")
//		public String main3(@RequestParam(name="year", required=true) String year) {   // 아래와 동일 
		public String main3(@RequestParam String year) {   
//		http://localhost/ch2/requestParam3         ---->> year=null   400 Bad Request. required=true라서 
//		http://localhost/ch2/requestParam3?year    ---->> year=""
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";	
	}

	@RequestMapping("/requestParam4")
	public String main4(@RequestParam(required=false) String year) {   
//		http://localhost/ch2/requestParam4         ---->> year=null 
//		http://localhost/ch2/requestParam4?year    ---->> year=""   
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";
	}

	@RequestMapping("/requestParam5")
	public String main5(@RequestParam(required=false, defaultValue="1") String year) {   
//		http://localhost/ch2/requestParam5         ---->> year=1   
//		http://localhost/ch2/requestParam5?year    ---->> year=1   
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";
	}
	
// =======================================================================
	
	@RequestMapping("/requestParam6") 
	public String main6(int year) {   
//		http://localhost/ch2/requestParam6        ---->> 500 java.lang.IllegalStateException: Optional int parameter 'year' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
//		http://localhost/ch2/requestParam6?year   ---->> 400 Bad Request, nested exception is java.lang.NumberFormatException: For input string: "" 
		System.out.printf("[%s]year=[%s]%n", new Date(), year);
		return "yoil";
	}
	
	@RequestMapping("/requestParam7") 
	public String main7(@RequestParam int year) {