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    • 11. JSP 내장 객체
      JSP/실전 JSP 2022. 11. 5. 22:51

      11-1. config 객체

      • web.xml (init param) --- getinitParameter() ---> jsp (int param)

       

      web.xml

      <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>testPjtConfig</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
 
  <servlet>
    <servlet-name>servletEx</servlet-name>
    <jsp-file>/jspEx.jsp</jsp-file>
    <init-param>
      <param-name>adminId</param-name>
      <param-value>admin</param-value>
    </init-param>
    <init-param>
      <param-name>adminPw</param-name>
      <param-value>1234</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>servletEx</servlet-name>
    <url-pattern>/jspEx.jsp</url-pattern>
  </servlet-mapping>
</web-app>

       

      jspEx.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
	<%! 
	String adminId;
	String adminPw;
	%>
	
	<%
	adminId = config.getInitParameter("adminId");
	adminPw = config.getInitParameter("adminPw");
	%>
	
	<p>adminId : <%= adminId %>
	<p>adminPw : <%= adminPw %>
	
</body>
</html>

       

       

      11-2. application 객체

      • 어플리케이션 전체(모든 jsp)에 데이터를 공유할 수 있음
      • 공통적으로 사용하는 정보들을 저장해놓고 공유해서 사용할수  있음
      • web.xml(context param) --- getinitParameter() ---> jsp(context param), jsp(context param), jsp(context param)

       

      context-param

      web.xml

      <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>testPjtConfig</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <context-param>
   <param-name>imgDir</param-name>
   <param-value>/upload/img</param-value>
  </context-param>
  <context-param>
   <param-name>testServerIP</param-name>
   <param-value>127.0.0.1</param-value>
  </context-param>
  <context-param>
   <param-name>realServerIP</param-name>
   <param-value>68.0.30.1</param-value>
  </context-param>
  
</web-app>

       

      jspEx.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
	<%! 
	String imgDir;
	String testServerIP;
	String realServerIP;
	%>
	
	<%
	imgDir = application.getInitParameter("imgDir");
	testServerIP = application.getInitParameter("testServerIP");
	realServerIP = application.getInitParameter("realServerIP");
	%>
	
	<p>imgDir : <%= imgDir %>
	<p>testServerIP : <%= testServerIP %>
	<p>realServerIP : <%= realServerIP %>
	
</body>
</html>

       

      application.setAttribute(" "," "), application.getAttribute(" "," ")

      jspEx.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		
		<%
			application.setAttribute("connectedIP", "165.62.58.23");
			application.setAttribute("connectedUser", "hong");
		%>
		
		
    </body>
</html>

       

      jspExGet.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		<%!
			String connectedIP;
			String connectedUser;
			
		%>
		
		<!-- application 객체 -->
		<%
			connectedIP = (String)application.getAttribute("connectedIP");
			connectedUser = (String)application.getAttribute("connectedUser");
		%>
		
		<p>connectedIP : <%= connectedIP %></p>
		<p>connectedUser : <%= connectedUser %></p>
		
    </body>
</html>

       

       

      11-3. out 객체

      jspEx.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		
		<!-- out 객체 -->
		<%
			out.print("<h1>Hello JAVA World!!</h1>");
			out.print("<h2>Hello JSP World!!</h2>");
			out.print("<h3>Hello Servlet World!!</h3>");
		%>
		
		
    </body>
</html>

       

       

      11-4. exception 객체

      jspEx.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<%@ page errorPage="errorPage.jsp"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		<%!
			String str;
		%>
		
		<!-- exception 객체 -->
		<%
			out.print(str.toString());
		%>
		
    </body>
</html>

       

      errorPage.jsp

      <%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<%@ page isErrorPage="true"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>

		<%
			response.setStatus(200);
			String msg = exception.getMessage();
		%>
		
		<h1> error message : <%= msg %> </h1>

    </body>
</html>

       

      'JSP > 실전 JSP' 카테고리의 다른 글

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      9. JSP 스크립트  (0) 2022.11.05
      8. form 데이터 처리  (0) 2022.11.05

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