weiyong
/
2001010304G01


			
				
					
						
						
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							<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: x'b'w
  Date: 2021/5/28
  Time: 13:39
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>JSTL标签</title>
</head>
<body>
<%--value用于显示在页面上,default用于在value无值时显示--%>
    <c:out value="hello world">

    </c:out>
    <br>

<%----------------------------------%>
    用户名为：
    <c:out value="${param.username}" default="unknown">
    </c:out>
    <br>
    <c:out value="${parma.username}">
        unknown
    </c:out>
<br>
<%------------------------------------------%>
<c:out value="${param.username}" escapeXml="false">
    <h1>java</h1>
</c:out>
<br>
<%------------------------------------------%>
    <%
        request.setAttribute("name",123);
    %>
    <c:if test="${name==123 }">

        <h1>welcome to javaWeb.</h1>
    </c:if>
<br>
<%--    <c:choose>--%>
<%--        <c:when test="${name == java}">--%>
<%--            你输入的内容为1：${name}--%>
<%--        </c:when>--%>
<%--&lt;%&ndash;        <c:otherwise>&ndash;%&gt;--%>
<%--&lt;%&ndash;            你输入的内容为2：${name}&ndash;%&gt;--%>
<%--&lt;%&ndash;        </c:otherwise>&ndash;%&gt;--%>
<%--    </c:choose>--%>
<%-------------------------------------------------%>
<c:choose>
    <c:when test="${empty param.username}">
       can't find the team.
    </c:when>
    <c:when test="${param.username=='AG'}">
        ${param.username} is AG.
    </c:when>
    <c:otherwise>
        ${param.username} is not a team name.
    </c:otherwise>
</c:choose>
<br>
<%------------------------------------------------------%>
    <%
        String[] AG = {"even","jwei","zq","zy","bean"};
    %>
    <c:forEach var="name" items="<%=AG%>">
        ${name}<br>
    </c:forEach>
<%------------------------------------------------------%>
    <%
        List list = new ArrayList();
        list.add("zq");
        list.add("zy");
        list.add("bean");
        list.add("even");
        list.add("jwei");
    %>
    <c:forEach var="team" items="<%=list%>" begin="1" end="3" step="2">
        ${team}<br>
    </c:forEach>
<%--------------------------------------------------------%>
<%
    List list1 = new ArrayList();
    list1.add("xql");
    list1.add("n9");
    list1.add("dbq");
%>
<table border="1">
    <tr>
        <td>序号</td>
        <td>索引</td>
        <td>是否为第一个元素</td>
        <td>是否为最后一个元素</td>
        <td>元素的值</td>
    </tr>
    <c:forEach var="name" items="<%=list1%>" varStatus="status">
        <tr>
            <td>${status.count}</td>
            <td>${status.index}</td>
            <td>${status.first}</td>
            <td>${status.last}</td>
            <td>${name}</td>
        </tr>
    </c:forEach>
</table>
<br>
<%----------------------------------------------------------------%>
绝对路径：<br>
<%--D:\JAVAWeb\TestServlet06\web\exe\JSTL\register.jsp--%>
<c:url var="myurl" value="http://localhost:8086/TestServlet06_war_exploded/exe/JSTL/register.jsp">
    <c:param name="username" value="李四"/>
    <c:param name="country" value="中国"/>
</c:url>
<a href="${myurl}">register.jsp</a><br>
相对路径：
<c:url var="myurl" value="register.jsp?username=Tom&country=France"/>
<a href="${myurl}">register.jsp</a>
</body>
</html>