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언어/JSP

[JSP] getRequestDispatcher 및 getAttribute

Sime 2016. 10. 27. 11:33


getRequestDispatcher 사용해서 url값으로 다시 넘김... forward를 통해 req,res를 같이 보냄


 

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


getAttribute를 통해 request에 값을 넣음


 

   request.setAttribute("result", result);




[ 예제 ]


start.jsp 

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<%@ 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>Start</title>
</head>
<body>
    <form action="forwardtest.jsp">
        <center>
        
        <input type="text" name="num1">
        <input type="text" name="num2">
        
            <select name="type" style="width: 50px; height: 25px;">
                <option value="1"> + </option>
                <option value="2"> - </option>
                <option value="3"> * </option>
            </select> <input type="submit" value="전송">
        </center>
    </form>
</body>
</html>
cs


forwardtest.jsp

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<%@ 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>forwardTest</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;
        
        //request에 result 저장
        request.setAttribute("result", result);
        //Dispatcher를 사용해서 url값으로 다시 넘겨 주세요~ forward를 통해 req,res를 같이 보냄
        request.getRequestDispatcher(url).forward(request, response);
    %>
</body>
</html>
cs


result.jsp

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<%@ 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>
<%
    int result = (Integer)request.getAttribute("result");
    out.print(result);
%>
</body>
</html>
cs



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