매료매료의 개발 이야기 :: 2일차

2일차 - 서블릿

| Bitcamp/BITCAMP - Servlet & JSP 2019. 8. 1. 16:07
Posted by 매료매료
<doGet> : value값이 url에 붙어나옴
<doPost> : value값이 url에 붙어나오지 않음.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>로그인 창</title>
</head>
<body>
	<form name="frmLogin" method="get" action="login2" encType="URF-8">// get or post 설정
		아이디 : <input type="text" name="user_id"> <br>
		비밀번호 : <input type="password" name="user_pw"> <br>
		<input type="submit" value="로그인"><input type="reset" value="다시입력">
	</form>
</body>
</html>

--------------------------------------------------------------------------

package sec01.ex01;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init() throws ServletException {
		System.out.println("init 메소드 호출");
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		System.out.println("destroy 메소드 호출");
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		String user_id = request.getParameter("user_id");
		String user_pw = request.getParameter("user_pw");
		System.out.println("아이디 : " + user_id);
		System.out.println("비밀번호 : " + user_pw);
	}
	
}

--------------------------------------------------------------------------

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>여러 가지 input 타입 표시 창</title>
</head>
<body>
	<form name="frmLogin" method="get" action="input2">
		아이디 : <input type="text" name="user_id"> <br>
		비밀번호 : <input type="password" name="user_pw"> <br>
		<input type="checkbox" name="subject" value="java" checked> 자바
		<input type="checkbox" name="subject" value="C언어" checked> C언어
		<input type="checkbox" name="subject" value="JSP" checked> JSP
		<input type="checkbox" name="subject" value="안드로이드" checked> 안드로이드
		<br><br>
		<input type="submit" value="전송">
		<input type="reset" value="초기화">
	</form>
</body>
</html>

--------------------------------------------------------------------------

package sec01.ex01;

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

/**
 * Servlet implementation class InputServlet
 */
@WebServlet("/input")
public class InputServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init() throws ServletException {
		System.out.println("init 메소드 호출");
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		System.out.println("destroy 메소드 호출");
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		String user_id = request.getParameter("user_id");
		String user_pw = request.getParameter("user_pw");
		System.out.println("아이디 : " + user_id);
		System.out.println("비밀번호 : " + user_pw);
		String[] subject = request.getParameterValues("subject");
		for(String str : subject) {
			System.out.println("선택한 과목 : " + str);
		}
	}

}

--------------------------------------------------------------------------

package sec01.ex01;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class InputServlet2
 */
@WebServlet("/input2")
public class InputServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init() throws ServletException {
		System.out.println("init 메소드 호출");
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		System.out.println("destroy 메소드 호출");
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		Enumeration enu = request.getParameterNames();
		while (enu.hasMoreElements())
		{
			String name = (String)enu.nextElement();
			String[] values = request.getParameterValues(name);
			for(String value : values)
			{
			System.out.println("name= " + name + ", value = " + value);
			}
		}
	}

}

--------------------------------------------------------------------------

package sec01.ex01;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class LoginServlet2
 */
@WebServlet("/login2")
public class LoginServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init() throws ServletException {
		System.out.println("init 메소드 호출");
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		System.out.println("destroy 메소드 호출");
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		
		//client에서 받을 user_id, user_pw
		String id = request.getParameter("user_id");
		String pw = request.getParameter("user_pw");
		
		String data = "<html>";
			data+= "<body>";
			data+= "아이디 : " + id;
			data+= "<br>";
			data+= "패스워드 : " + pw;
			data+= "</html>";
			data+= "</body>";
		out.print(data); // 브라우저로 쏨
	}

}
--------------------------------------------------------------------------
<환율계산기>

package sec02.ex01;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class CalcServlet
 */
@WebServlet("/calc")
public class CalcServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static final float USD_RATE = 1188.80F;
	private static final float JPY_RATE = 1089.24F;
	private static final float CNY_RATE = 172.07F;
	private static final float GBP_RATE = 1441.00F;
	private static final float EUR_RATE = 1312.38F;

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init() throws ServletException {
		System.out.println("init 메소드 호출");
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		System.out.println("destroy 메소드 호출");
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter pw = response.getWriter();
		
		String command = request.getParameter("command");
		String won = request.getParameter("won");
		String operator = request.getParameter("operator");
		
		if(command != null && command.equals("calculate"))
		{
			String result = calculate(Float.parseFloat(won), operator);
			pw.print("<html><font size=10>변환 결과</font><br>");
			pw.print("<html><font size=10>" + result + "</font><br>");
			pw.print("<a href='/pro06/calc'>환율 계산기</a>"); // 다른 페이지로 이동
			return;
		}
		
		pw.print("<html><title>환율계산기</title>");
		pw.print("<font size=5>환율계산기</font><br>");
		pw.print("<form name='frmCalc' method='get' action = '/pro06/calc'/>");
		pw.print("원화 : <input type='text' name='won' size= 10 />");
		pw.print("<select name='operator'>");
		pw.print("<option value='dollar'>달러</option>");
		pw.print("<option value='en'>엔화</option>");
		pw.print("<option value='wian'>위안</option>");
		pw.print("<option value='pound'>파운드</option>");
		pw.print("<option value='euro'>유로</option>");
		pw.print("</select>");
		pw.print("<input type='hidden' name='command' value='calculate' />"); // hidden -> 서버로 전송하는 부분.
		pw.println("<input type='submit' value='변환' />");
		pw.println("</form>");
		pw.print("</html>");
		pw.close();
	}
		
	private String calculate(float won, String operator) {
		String result = null;
		if(operator.equals("dollar")) {
			result = String.format("%.6f", won / USD_RATE);
		} else if(operator.equals("en")) {
			result = String.format("%.6f", won / JPY_RATE);
		} else if(operator.equals("wian")) {
			result = String.format("%.6f", won / CNY_RATE);
		} else if(operator.equals("pound")) {
			result = String.format("%.6f", won / GBP_RATE);
		} else if(operator.equals("euro")) {
			result = String.format("%.6f", won / EUR_RATE);
		}
		return result;
	}

}
'Bitcamp > BITCAMP - Servlet & JSP' 카테고리의 다른 글

4일차 (0)	2019.08.05
3일차 (0)	2019.08.02
JSP(Java Server Page) (0)	2019.08.02
2일차 - HTML (0)	2019.08.01
1일차 (0)	2019.07.31
And
매료매료의 개발 이야기

Article Category

Notice

Recent Article

Recent Comment

2일차 - 서블릿

'Bitcamp > BITCAMP - Servlet & JSP' 카테고리의 다른 글

Tag Cloud

Calendar

Archive

My Link

티스토리툴바
