카테고리 없음

[JSP] 스크립트 태그

아잠만_ 2024. 6. 25. 14:16

스크립트 태그

스크립틀릿(Scriptlet) 선언문(declaration) 표현문
<% ... %> <%! ... %> <%= ... %>
(지역성) 자바 문법 사용 
메소드 없이 변수만을 선언
(전역성) 자바 변수나 메서드 정의 문자열 형태로 출력
세미콜론으로 종료할 수 없음

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Scripting Tag</title>
</head>
<body>
	<h2>Scripting Tag</h2>
	<%! // 선언문 태그 (변수, 메서드 선언)
	// 전역 변수 선언
	int count = 3;
	
	// 전역 메서드 선언 (영문 소문자로 변환하여 리턴)
	// String : 리턴 타입 / data : 매개변수(파라미터(인수)를 받음)
	// 접근제한자 생략 시 open 범위는  >> 동일 패키지 (default)
	String makeItLower(String data){
		return data.toLowerCase();
	}
	%>
	
	<% // 스크립틀릿 태그(자바 로직 코드 생성)
		// 지역 변수 i. 1부터 3까지 1씩 증가
		for(int i=1; i<=count; i++){
			// out : JSP의 기본 내장 객체 - 화면에 출력 (PrintWrite)
			out.println("Java Server Pages " + i + ".<br />");
		}
	%>
	<!-- 표현문 태그 -->
	<%=makeItLower("HELLO WORLD") %>
	
</body>
</html>
더보기
/*
 * Generated by the Jasper component of Apache Tomcat
 * Version: Apache Tomcat/9.0.90
 * Generated at: 2024-06-24 08:08:35 UTC
 * Note: The last modified time of this file was set to
 *       the last modified time of the source file after
 *       generation to assist with modification tracking.
 */
package org.apache.jsp.ch02;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;

public final class scripting_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent,
                 org.apache.jasper.runtime.JspSourceImports {

 // 선언문 태그 (변수, 메서드 선언)
	// 전역 변수 선언
	int count = 3;
	
	// 전역 메서드 선언 (영문 소문자로 변환하여 리턴)
	// String : 리턴 타입 / data : 매개변수(파라미터(인수)를 받음)
	// 접근제한자 생략 시 open 범위는  >> 동일 패키지 (default)
	String makeItLower(String data){
		return data.toLowerCase();
	}
	
  private static final javax.servlet.jsp.JspFactory _jspxFactory =
          javax.servlet.jsp.JspFactory.getDefaultFactory();

  private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;

  private static final java.util.Set<java.lang.String> _jspx_imports_packages;

  private static final java.util.Set<java.lang.String> _jspx_imports_classes;

  static {
    _jspx_imports_packages = new java.util.LinkedHashSet<>(4);
    _jspx_imports_packages.add("javax.servlet");
    _jspx_imports_packages.add("javax.servlet.http");
    _jspx_imports_packages.add("javax.servlet.jsp");
    _jspx_imports_classes = null;
  }

  private volatile javax.el.ExpressionFactory _el_expressionfactory;
  private volatile org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> getDependants() {
    return _jspx_dependants;
  }

  public java.util.Set<java.lang.String> getPackageImports() {
    return _jspx_imports_packages;
  }

  public java.util.Set<java.lang.String> getClassImports() {
    return _jspx_imports_classes;
  }

  public javax.el.ExpressionFactory _jsp_getExpressionFactory() {
    if (_el_expressionfactory == null) {
      synchronized (this) {
        if (_el_expressionfactory == null) {
          _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
        }
      }
    }
    return _el_expressionfactory;
  }

  public org.apache.tomcat.InstanceManager _jsp_getInstanceManager() {
    if (_jsp_instancemanager == null) {
      synchronized (this) {
        if (_jsp_instancemanager == null) {
          _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
        }
      }
    }
    return _jsp_instancemanager;
  }

  public void _jspInit() {
  }

  public void _jspDestroy() {
  }

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
      throws java.io.IOException, javax.servlet.ServletException {

    if (!javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
      final java.lang.String _jspx_method = request.getMethod();
      if ("OPTIONS".equals(_jspx_method)) {
        response.setHeader("Allow","GET, HEAD, POST, OPTIONS");
        return;
      }
      if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method)) {
        response.setHeader("Allow","GET, HEAD, POST, OPTIONS");
        response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSP들은 오직 GET, POST 또는 HEAD 메소드만을 허용합니다. Jasper는 OPTIONS 메소드 또한 허용합니다.");
        return;
      }
    }

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/html; charset=UTF-8");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("<!DOCTYPE html>\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<title>Scripting Tag</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("	<h2>Scripting Tag</h2>\r\n");
      out.write("	");
      out.write("\r\n");
      out.write("	\r\n");
      out.write("	");
 // 스크립틀릿 태그(자바 로직 코드 생성)
		// 지역 변수 i. 1부터 3까지 1씩 증가
		for(int i=1; i<=count; i++){
			// out : JSP의 기본 내장 객체 - 화면에 출력 (PrintWrite)
			out.println("Java Server Pages " + i + ".<br>");
		}
	
      out.write("\r\n");
      out.write("	\r\n");
      out.write("	");
      out.print(makeItLower("HELLO WORLD") );
      out.write("\r\n");
      out.write("	\r\n");
      out.write("</body>\r\n");
      out.write("</html>");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            if (response.isCommitted()) {
              out.flush();
            } else {
              out.clearBuffer();
            }
          } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Scripting Tag</title>
</head>
<body>
	<%! // 선언문 태그
		// 정수형 변수. 할당(대입)
		int data = 50; 
		
		// 전역 메서드
		// 매개변수, 리턴타입
		public int sum(int a, int b){
			return a+b;
		};
		
		public String makeItLower(String name){
			return name.toLowerCase();
		}
	%>
		
	<% // 스크립틀릿
		out.println("data : "+data+"<br>");
		out.println("2 + 3 = "+sum(2,3)+"<br>"); // 파라미터, (메서드) 호출
		out.println(makeItLower("HELLO DUCK")+"<br>");
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Scripting Tag</title>
</head>
<body>
	<%	// 스크립틀릿
		// ** 지역변수
		// 선언과 동시에 값을 할당 ==> 초기화
		int a = 2;
		int b = 3;
		int sum = a+b;
		// out객체 : JSP기본 내장 객체
		out.print(a+" + "+b+" = "+sum);
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Scripting Tag</title>
</head>
<body>
	<%	// 스크립틀릿
		// 0부터 10까지의 짝수를 화면에 출력
		for(int i=0; i<=10; i=i+2){
			out.print(i+"<br>");
		}
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ page import="java.util.Date"%>
<!DOCTYPE html>
<html>
<head>
<title>Scripting Tag</title>
</head>
<body>
	<%	// 스크립틀릿
		// 지역변수
		int a = 10;
		int b = 20;
		int c = 30;
		
		out.print(a + b + c + "<br>");
	%>
	<!-- 표현문 -->
	<p>오늘은 <%=new Date().getDate()%>일 입니다.</p>
	<p><%=a + b + c %></p>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Welcome</title>
<link rel="stylesheet" href="/css/bootstrap.min.css">
</head>
<body>
	<nav class="navbar navbar-expand navbar-dark bg-dark">
		<div class="container">
			<div class="navbar-header">
				<a class="navbar-brand" href="/welcome.jsp">Home</a>
			</div>
		</div>
	</nav>
	<%! // 선언문
		// 전역변수
		String greeting = "Welcome to My Page";
		String tagline = "I want to sleep";
	%>
	<!-- 표현문 -->
	<div class="jumbotron">
		<div class="container">
			<h1 class="display-3"><%=greeting %></h1>
		</div>
	</div>
	<div class="container">
		<div class="text-center">
			<h3><%=tagline %></h3>
		</div>
	</div>
	<footer class="container">
		<p>&copy; 오리</p>
	</footer>
</body>
</html>