기본 값 사용하기

Nana.java

package com.newlectrue.web;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/hello2")
public class Nana extends HttpServlet {

	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html; charset=utf-8");

		PrintWriter out = response.getWriter();

//		임시 변수명은 끝에 언더바를 추가함
		String cnt_ = request.getParameter("cnt");

//		기본 값 지정
		int cnt = 10;

//		cnt_가 null 아닐때, cnt_가 빈 문자열이 아닐때
		if (cnt_ != null && !cnt_.equals("")) {
			cnt = Integer.parseInt(cnt_);
		}

		for (int i = 0; i < cnt; i++) {
			out.println((i + 1) + ": 안녕 Servlet<br />");
		}
	}
}

 

 

 

https://youtu.be/j6lXa1adyM0?list=PLq8wAnVUcTFVOtENMsujSgtv2TOsMy8zd