JSP|転送

25866 ワード
jsp フォワード RequestDispatcher テキストリンク

RequestDispatcherクラス


  • 受信要求を他の要素
    • に委任する.
  • 被要求要素の要求オブジェクトは、被許可要素の要求オブジェクトと同じ
    • である.
  • dispacherJsp.jsp 
    • <%@ page language="java" contentType="text/html; charset=EUC-KR"
	pageEncoding="EUC-KR"%>
<!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=EUC-KR">
<title>Insert title here</title>
</head>
<body>

	dispacherJsp.jsp
	<hr />

	id :
	<%=request.getAttribute("id")%>
	<br /> pw :
	<%=request.getAttribute("pw")%>


	<!--jsp에서도 RequestDispatcher를 생성해서 다른 곳으로 요청을 위임할 수 있음
		RequestDispatcher dispatcher = request.getRequestDispatcher("/dispacherJsp.jsp");
		dispatcher.forward(request, response); -->
</body>
</html>
  • RequestObj.java 
    • package com.javalec.ex;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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 RequestObj
 */
@WebServlet("/RequestObj")
public class RequestObj extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RequestObj() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("doGet");
		actionDo(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("doPost");
		actionDo(request, response);
	}
	
	private void actionDo(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("actionDo");
		
		request.setAttribute("id", "abcde");
		request.setAttribute("pw", "12345");
		
		//생성 단계 getRequestDispatcher("/dispacherJsp.jsp") : 위임 받을 컴퍼넌트의 위치
		RequestDispatcher dispatcher = request.getRequestDispatcher("/dispacherJsp.jsp");
		dispatcher.forward(request, response);
		
	}

}

    HttpServletResponse


  • requestDispatcherとの違い:承認コンポーネントと要求コンポーネントが使用する要求オブジェクトが異なる
  • redirect.jsp 
    • <%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!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=EUC-KR">
<title>Insert title here</title>
</head>
<body>

		<%
			request.setAttribute("id", "abcde");
			request.setAttribute("pw", "12345");
			
			//HttpSevletResponse의 객체
			response.sendRedirect("RequestObj");
		%>

</body>
</html>
  • RequestObj.java 
    • package com.javalec.ex;

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

import javax.servlet.RequestDispatcher;
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 RequestObj
 */
@WebServlet("/RequestObj")
public class RequestObj extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RequestObj() {
        super();
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println("doGet");
		actionDo(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println("doPost");
		actionDo(request, response);
	}
	
	private void actionDo(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	
		System.out.println("actionDo");
		
		
		//redirect.jsp와 request 객체가 다르므로 redirect.jsp에서 입력한 값이 아닌, null
		String id = (String)request.getAttribute("id");
		String pw = (String)request.getAttribute("pw");
		
		response.setContentType("text/jhtml; charset=EUC-KR");
		PrintWriter writer = response.getWriter();
		writer.print("<html><head></head><body>");
		writer.print("RequestObj" + "<hr />");
		writer.print("id : " + id + "<br />");
		writer.print("pw : " + pw);
		writer.print("</body></html>");
		
	}

}
    memcachedテスト
    XTEST試験結果(XTEST 100000.C)