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    • Tue/Feb/04 [Java] day24. - JSP
      Study/2020 국비교육_Java 2020. 2. 4. 09:51

      Tue/Feb/04

      [Java] day24.

       - JSP

       

      어제 퀴즈 리뷰

       

      Session 이어서

       

      Session 생성 방지; Session 객체만 사용 방지

      <%@ page session = "false" %>

       

      Session 최대활성화 기간 확인과 조정

      int timeout = session.getMaxInactiveInterval();

session.setMaxInactiveInterval(300);

session.setMaxInactiveInterval(-1);
// 최대 비활성 기간을 무한대로

       

      예제1 ) Session 과 PrintWriter 활용한 회원가입 페이지

      PersonalInfo.html

      <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>회원 가입</title>
</head>
<body>

	<h1>회원 가입 입력</h1>
	<form action=Agreement.jsp method=get>
		<table>
			<tr>
				<td>ID :</td>
				<td><input type="text" name="id" required pattern="\w+" /> <br />
			</tr>

			<tr>
				<td>PW :</td>
				<td><input type="password" name="pw" required pattern="\w+" /></td>
			</tr>
			<tr>
				<td>이름 :</td>
				<td><input type="text" name="name" required pattern="[ㄱ-힣]+" /></td>
			</tr>

			<tr>
				<td>다음</td>
				<td><input type="submit" value="NEXT" /></td>
			</tr>
		</table>
	</form>

</body>
</html>

      Agreement.jsp

      <%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>

<%
	String id = request.getParameter("id");
	String pw = request.getParameter("pw");
	String name = request.getParameter("name");

	session.setAttribute("id", id);
	session.setAttribute("pw", pw);
	session.setAttribute("name", name);
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>약관 확인</title>
</head>
<body>
	<h2>회원 약관을 확인합니다</h2>


	<table border=1>
		<tr>
			<td>1. 회원 정보는 웹 사이트의 운영을 위해서만 사용됩니다.</td>
		</tr>

		<tr>
			<td>2. 웹 사이트의 정상 운영을 방해하는 회원은 탈퇴 처리합니다.</td>
		</tr>
	</table>
	<p>
	<form action=Subscribe.jsp method=get>
		위 약관에 동의하십니까? &nbsp; <input type="radio" name=agree value=yes />
		&nbsp; 네 &nbsp; <input type="radio" name=agree value=no /> &nbsp; 아니오
		&nbsp; <input type="submit" value=NEXT />
	</form>

</body>
</html>

      Subscribe.jsp

      <%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"	import = "java.io.*" %>

<%
	String agree = request.getParameter("agree");
	String result = null;
	
	if(agree.equals("yes")) {
		String id = (String) session.getAttribute("id");
		String pw = (String) session.getAttribute("pw");
		String name = (String) session.getAttribute("name");
		
		PrintWriter writer = null;
		
		try {
			String filePath = application.getRealPath("/WEB-INF/"+id+".txt");
			writer = new PrintWriter(filePath);
			writer.println("ID : "+id);
			writer.println("PW : " + pw);
			writer.println("이름 : " + name);
			result = "success";
		}
		catch (IOException ioe) {
			result = "fail";	
		}
		finally {
			try {
				writer.close();
			}
			catch (Exception e) {
				
			}
		}
	}
	else result = "fail";
	session.invalidate();

	response.sendRedirect("Result.jsp?result="+result);
%>

      Result.jsp

      <%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.io.*"%>

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RESULT</title>
</head>
<body>
	<h1>회원 가입 결과</h1>
	<%
		if ( request.getParameter("result").equals("success") ) 	
					out.print("회원가입을 축하드립니다");
		else 		out.print("회원가입 실패!");
	%>
</body>
</html>

       

      예제2) 위의 예제에서 일부 페이지 JSP 대신에 Servlet 사용

      Servlet에서 JSP 내장객체 사용

      ServletContext application = request.getServletContext();
application.getRealPath("***");
// ServletContext 객체 생성으로 application과 동일 효과

PrintWriter out = response.getWriter();
// PrintWriter 객체 생성으로 out 효과

HttpSession session = request.getSession();
// HttpSession 객체 생성으로 session 가져오기

protected void doGet(HttpServletRequest request, HttpServletResponse response){  }
protected void doPost(HttpServletRequest request, HttpServletResponse response){  }
// JSP의 request, response 가져오기

      InfoSavaServlet.java

      import java.io.IOException;

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

@WebServlet("/infosave")
public class InfoSaveServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public InfoSaveServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String id = request.getParameter("id");
		String pw = request.getParameter("pw");
		String name = request.getParameter("name");

		HttpSession ss = request.getSession();
		ss.setAttribute("id", id);
		ss.setAttribute("pw", pw);
		ss.setAttribute("name", name);

		response.sendRedirect("Agreement.jsp");

	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

      SubscribeServlet.java

      import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

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

@WebServlet("/subscribe")
public class SubscribeServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public SubscribeServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String agree = request.getParameter("agree");

		if (agree.equals("yes")) {

			HttpSession ss = request.getSession();
			String id = (String) ss.getAttribute("id");
			String pw = (String) ss.getAttribute("pw");
			String name = (String) ss.getAttribute("name");

			ServletContext application = request.getServletContext();
			String file_path = application.getRealPath("/WEB-INF/");
			// String file_path =
			// "C:/java_webserver/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/lecture0204_join_servlet/WEB-INF/lib/"+id+".txt";

			FileWriter fw;
			try {
				fw = new FileWriter(file_path);
				BufferedWriter bw = new BufferedWriter(fw);

				bw.write("ID : " + id);
				bw.newLine();

				bw.write("PW : " + pw);
				bw.newLine();

				bw.write("NAME : " + name);
				bw.newLine();

				bw.close();

				response.sendRedirect("Result.jsp?result=success");
			} catch (IOException ioe) {
				response.sendRedirect("Result.jsp?result=fail");
			} finally {
				ss.invalidate();
			}
		} else
			response.sendRedirect("Result.jsp?result=fail");
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

       

      JSP ] Log File 만들기

      <%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8" import="java.io.*, java.util.*, java.net.*"%>

<%!
	private PrintWriter logFile;

	public void jspInit() {
		String filename = "c:/filetest/datetime_log.txt";
		try {
			FileWriter fw = new FileWriter(filename, true);
			logFile = new PrintWriter(fw);

		} catch (IOException ioe) {
			System.out.printf("%TT - %s 파일을 열 수 없습니다", new GregorianCalendar(), filename);
		}
	}
	
	private String getIP(){
		String ip = null;
		try {
			ip = InetAddress.getLocalHost().getHostAddress();	
		}
		catch (UnknownHostException e) {
			System.out.println("ERR_getIP"+e.getMessage());
		}
		return ip;
	}
%>

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

	<%
		GregorianCalendar now = new GregorianCalendar();
		String date = String.format("현재날짜 : %TY년 %Tm월 %Te일", now, now, now);
		String time = String.format("현재날짜 : %TI시 %TM분 %TS초", now, now, now);
		
        String ip = String.format("IP address : %s", getIP());

		out.println(date + "<br />");
		out.println(time + "<br />");
		out.println(ip + "<br />");

		if (logFile != null) {
			logFile.printf("%TF %TT에 호출되었습니다 %n", now, now);
			logFile.printf("IP address : %s%n", ip);
		}
	%>

</body>
</html>

<%!
	public void jspDestroy() {
		if (logFile != null) {
			logFile.close();
		}
	}
%>

       

      Servlet ] Fibonacci 수열 

      fibonacci.html

      <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h2>Fibonacci 만들기</h2>
	<form action="fibo">
		<input type="text" name="NUM" required />
		<input type="submit"	value="submit" />
	</form>
</body>
</html>

      FibonacciServlet.java

      import java.io.IOException;
import java.io.PrintWriter;
import java.math.BigInteger;

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;

@WebServlet("/fibo")
public class FibonacciServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public FibonacciServlet() {
		super();
	}

	private BigInteger arr[];
	// Biginteger 도 내부가 String 형태 > 어떤 숫자가 와도 다 받음, 단 String 형태이므로 문자열로 받음

	public void init(ServletConfig config) throws ServletException {
		arr = new BigInteger[100];
		// arr[] 배열 선언
		arr[0] = new BigInteger("1");
		arr[1] = new BigInteger("2");
		// BigInteger 객체 생성

		for (int cnt = 2; cnt < arr.length; cnt++) {
			arr[cnt] = arr[cnt - 2].add(arr[cnt - 1]);
		}

	} // init ()

	public void destroy() {

	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String str = request.getParameter("NUM");
		int num = Integer.parseInt(str);

		if (num > 100) {
			num = 100;
		}

		response.setContentType("text/html; charset = UTF-8");
		PrintWriter out = response.getWriter();
		out.println("<HTML>");
		out.println("<HEAD>");
		out.println("<META charset = 'UTF-8'>");
		out.println("<TITLE>피보나치 수열</TITLE>");
		out.println("</HEAD>");
		out.println("<BODY>");

		for (int cnt = 0; cnt < num; cnt++) {
			out.println((cnt+1) + " : "+arr[cnt] + "<br />");
		}

		out.println("</BODY>");
		out.println("</HTML>");

	}	// doGet()

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

       

      실습)

      process 입력 / 삭제 웹화면 구현 (SQL - JSP - Servlet)

      [my solution]

      주요 고비

      검색 창을 어떻게 해야될까..?

      https://github.com/ezerwi/lecture0204_search/tree/master/WebContent

      불러오는 중입니다...

       

      mySQL

      - database process

       - table proc_table;

      create table proc_table (idx int not null auto_increment primary key, name varchar(10) not null, type varchar(20) not null, cpu int, memory int, incoming float(2), outgoing float(2), connection1 varchar(20), connection2 varchar(20));

       

      Java Class

      DB

       - conDB();

       

      Servlets

       - select_all()

       - select_one()

       - insert_one()

       - delete_one()

       - search()

       

      JSP

       - list.jsp ; select_all()

       - insert.jsp ; insert_one(); search()

       - delete.jsp ; String[] idx = getParameterValues("idx"), for(String i : idx) delete_one(idx[i]);

      저작자표시 비영리 동일조건

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