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WEB_Programming/JSTL

6. JSTL foreach 문 처리

neokido 2008. 6. 20. 13:06

1. foreach loop 기본
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
  <head>
    <title>Count to 10 Example(using JSTL)</title>
  </head>

  <body>
    <c:forEach var="i" begin="1" end="10" step="1">
      <c:out value="${i}" />

      <br />
    </c:forEach>
  </body>
</html>

2. Begin, End 스텝을 이용한 foreach
<%@ taglib prefix="c"    uri="http://java.sun.com/jstl/core" %>

<c:set var="names" value="Peter, Pat, Mark, Tracy" scope="page" />

<html>
  <head>
    <title>forEach and status</title>
  </head>

  <body>
    <h1>The forEach tag exposes a scoped variable called 'count', which
    is the position of the current iteration of the collection.</h1>

    <h2>(Note, it is <i>not</i> the position of the element in the
        underlying collection)</h2>

    <c:forEach items="${pageScope.names}"
               var="currentName"
               varStatus="status"
               begin="0"
               end="3"
               step="2">

      Family member #<c:out value="${status.count}" /> is
        <c:out value="${currentName}" /> <br />
    </c:forEach>
  </body>
</html>

3. Integer 를 이용하기 위한 foreach loop
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
  <head>
    <title>Count to 10 Example(using JSTL)</title>
  </head>

  <body>
    <table border="1">
      <tr>
        <td valign="top">
          <h3>From 1 to 10</h3>

          <c:forEach var="i" begin="1" end="10">
            <c:out value="${i}" />

            <br />
          </c:forEach>
        </td>

        <td valign="top">
          <h3>From 10 to 1</h3>

          <c:forEach var="i" begin="1" end="10">
            <c:out value="${11-i}" />

            <br />
          </c:forEach>
        </td>
      </tr>
    </table>
  </body>
</html>

4. 스트링 처리를 위한 forEach 태그
<%@ taglib uri="http://java.sun.com/jstl/core"    prefix="c" %>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c-rt" %>

<%
  String[] bikes = { "A", "B", "C" };
%>
  <!-- application.setAttribute("bikeList", bikes); -->  

<HTML>
  <HEAD><TITLE>JSTL 'forEach' tag</TITLE></HEAD>
  <BODY>
    Here are my bikes:
    <UL>
      <c-rt:forEach var="bike" items="<%= bikes %>">
        <LI><c:out value="${bike}" />
      </c-rt:forEach>
    </UL>
  </BODY>
</HTML>

5. forEach에서 status Count 처리
<%@ taglib prefix="c"    uri="http://java.sun.com/jstl/core" %>

<c:set var="names" value="A B C, D" scope="page" />

<html>
  <head>
    <title>forEach and status</title>
  </head>

  <body>
    <c:forEach items="${pageScope.names}"
               var="currentName"
               varStatus="status"
    >
      Family member #<c:out value="${status.count}" /> is
        <c:out value="${currentName}" /> <br />
    </c:forEach>
  </body>
</html>

6. Step 를 이용한 forEach 문
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
  <head>
    <title>Count to 10 Example(using JSTL)</title>
  </head>

  <body>
    <table border="1">
   <tr>
        <td>
          <h3>By Twos</h3>

          <c:forEach var="i" begin="2" end="10" step="2">
            <c:out value="${i}" />

            <br />
          </c:forEach>
        </td>

        <td valign="top">&nbsp;
        </td>
      </tr>
    </table>
  </body>
</html>

7. 인덱스에 의한 배열 참조
<%@ taglib uri="http://java.sun.com/jstl/core"    prefix="c" %>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c-rt" %>

<%!
  String[] names = { "A","B", "C", "D" };
  int[]    ages  = { 29, 8, 6, 5};
%>

<HTML>
  <HEAD><TITLE>JSTL 'forEach' tag</TITLE></HEAD>
  <BODY>
    <H1>List of people</H1>
    <TABLE BORDER="1">
      <TH>Name</TH>
      <c-rt:forEach var="person" items="<%= names %>">
        <TR>
          <TD><c:out value="${person}"  /></TD>
          <TD><c:out value="${ages[i]}" /></TD>
        </TR>
      </c-rt:forEach>
    </TABLE>
  </BODY>
</HTML>

8. 콤마 딜리미터를 처리하기 위한 forEach
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jstl/core-rt" prefix="c-rt" %>
<html>
  <head>
    <title>Count to 10 Example(tracking even and odd)</title>
  </head>

  <body>
    <c:set var="days" value="A,B,C,D,E,F,G" />

    <table border="0">
      <c:forEach var="i" items="${days}" varStatus="status">
        <jsp:useBean id="status"
        type="javax.servlet.jsp.jstl.core.LoopTagStatus" />

        <c-rt:choose>
          <c-rt:when test="<%=status.getCount()%2==0%>">
            <c:set var="color" value="#cccccc" />
          </c-rt:when>

          <c-rt:otherwise>
            <c:set var="color" value="#dddddd" />
          </c-rt:otherwise>
        </c-rt:choose>

        <tr>
          <td width="200" bgcolor="<c:out value="${color}"/>">
          <c:out value="${i}" />
          </td>
        </tr>
      </c:forEach>
    </table>
  </body>
</html>

9. ArrayList를 이용한 forEach
<%@ page language="java" contentType="text/html" %>
<%@ page import="java.util.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<%
  // Create an ArrayList with test data
  ArrayList list = new ArrayList();
  Map author1 = new HashMap();
  author1.put("name", "A");
  author1.put("id", new Integer(1));
  list.add(author1);
  Map author2 = new HashMap();
  author2.put("name", "B");
  author2.put("id", new Integer(2));
  list.add(author2);
  Map author3 = new HashMap();
  author3.put("name", "C");
  author3.put("id", new Integer(3));
  list.add(author3);
  pageContext.setAttribute("authors", list);
%>

<html>
  <head>
    <title>Search result: Authors</title>
  </head>
  <body bgcolor="white">
    Here are all authors matching your search critera:
    <table>
      <TH>Name</th>
      <TH>Id</th>
      <c:forEach items="${authors}" var="current">
        <tr>
          <td><c:out value="${current.name}" /><td>
          <td><c:out value="${current.id}" /><td>
        </tr>
      </c:forEach>
    </table>
  </body>
</html>

10. 벡터를 통한 forEach 문
<html>
  <head>
    <title>Tag Plugin Examples: forEach</title>
  </head>
  <body>
    <h1>Tag Plugin Examples - &lt;c:forEach></h1>

    <hr>
    <font color="#000000"/>
    </br>

    <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
    <%@ page import="java.util.Vector" %>

    <% Vector v = new Vector();
  v.add("One"); v.add("Two"); v.add("Three"); v.add("Four");

  pageContext.setAttribute("vector", v);
    %>

    <h3>Iterating over a Vector</h3>

    <c:forEach items="${vector}" var="item" >
      <c:out value="${item}"/>
    </c:forEach>


  </body>
</html>

11. forEach에서 홀수 처리하기
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jstl/core-rt" prefix="c-rt" %>
<html>
  <head>
    <title>Count to 10 Example(tracking even and odd)</title>
  </head>

  <body>
    <table border="0">
      <c:forEach var="i" begin="1" end="10" varStatus="status">
        <jsp:useBean id="status" type="javax.servlet.jsp.jstl.core.LoopTagStatus" />

        <c-rt:choose>
          <c-rt:when test="<%=status.getCount()%2==0%>">
            <c:set var="color" value="#eeeeee" />
          </c-rt:when>

          <c-rt:otherwise>
            <c:set var="color" value="#dddddd" />
          </c-rt:otherwise>
        </c-rt:choose>

        <tr>
          <td width="200" bgcolor="<c:out value="${color}"/>">
          <c:out value="${i}" />
          </td>
        </tr>
      </c:forEach>
    </table>
  </body>
</html>

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