재미있게 코딩합시다

JSP - forward 본문

IT /JSP

JSP - forward

감민셔 2018. 12. 26. 17:53

Forward(포워드)

-request스코프에 담긴값 (request,response이 유지된다)

- 이동된 url이 화면에 보이지않는다(사용자는 알수없다)

-포워드 하는법 : 

 1.<jsp:forward page="이동할페이지">;

 2.RequestDispatcher rd = request.getRequestDispatcher("이동할페이지");

rd.forward(request,response);


start.jsp



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

pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<!-- 이 화면에서는 1,2,3 중 하나를 선택해서 -->

<!-- forwartTest.jsp로 선택한 값을 하나 들고 -->

<!-- 이동하도록 셋팅 -->

<form action="forwardTest.jsp">

<input type="text" name = "num1">

<input type="text" name = "num2">

<select name="type">

<option value="1">1번</option>

<option value="2">2번</option>

<option value="3">3번</option>

</select>

<input type="submit" value="가즈아!!!">

</form>

</body>

</html>


ForwardTest.jsp



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

    pageEncoding="UTF-8"%>

    

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>


<%

String param = request.getParameter("type");

String url = "result.jsp";

int num1 = Integer.parseInt(request.getParameter("num1"));

int num2 = Integer.parseInt(request.getParameter("num2"));

int result = 0;

if(param.equals("1")){

result = num1 + num2;

}else if(param.equals("2")){

result = num1 - num2;

}else if(param.equals("3")){

result = num1 * num2;

}

//데이터를 리퀘스트 데이터에 담기.

request.setAttribute("result", result);

request.getRequestDispatcher(url).forward(request, response);


%>

</body>

</html>



a.jsp


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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>


여기는 a 라는 페이지입니다.


</body>

</html>


b.jsp

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>


여기는 b 라는 페이지입니다.


</body>

</html>


c.jsp


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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>


여기는 c 라는 페이지입니다.


</body>

</html>



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