jstl使用

//普通字符处
		request.setAttribute("hello","hello world");
		
//		html文本
		request.setAttribute("bj","<font color='red'>北京欢迎你</font>");
		
//		测试条件控制标签
		request.setAttribute("v1", 1);
		request.setAttribute("v2", 2);
		request.setAttribute("v3", new ArrayList());
		request.setAttribute("v4", "test");
		
		//集合
		Group group=new Group();
		group.setName("尚学堂");
		
		List list=new ArrayList();
		for(int i=0;i<10;i++){
			User u=new User();
			u.setName("User"+i);
			u.setGroup(group);
			list.add(u);
		}
		request.setAttribute("list", list);
		
//		map
		Map map=new HashMap();
		map.put("key1", "v1");
		map.put("key2", "v2");
		request.setAttribute("map", map);
		
//		测试c:forToken
		request.setAttribute("tokens", "1,2,3,4,5,6");
		return mapping.findForward("success");

 JSP中代码

<li>测试c:out</li><br>
hello(c:out):<c:out value="${hello}"></c:out><br>
hello(el表达式):${hello }<br>
hello(default="123"):<c:out value="${abc}" default="123" ></c:out><br>
hello(default="123"):<c:out value="${abc}">123</c:out><br>

bj(default):<c:out value="${bj}"></c:out><br>
bj(escapeXml="true"):<c:out value="${bj}" escapeXml="true"></c:out><br>
bj(escapeXml="false"):<c:out value="${bj}" escapeXml="false"></c:out><br>
bj(el表达式)：${bj }
<p>
<li>测试c:set和c:remove</li><br>
<c:set  var="temp" value="123" scope="page"></c:set>
temp:${temp }<br>
<c:remove var="temp"/>
temp:${temp }<br>
<p>
<li>测试c:if</li><br>
<c:if test="${v1 lt v2}" var="v">
	v1小于v2<br>
	条件表达式的值:${v }
</c:if>
<br>
<c:if test="${empty v3}">
v3为空<br>
</c:if>
<c:if test="v4">
	v4为空
</c:if>

<li>测试条件控制标签c:choose,c:when,c:otherwise</li><br>
相当于if .. else ..
<c:choose>
	<c:when test="${v1 lt v2}">
		v1小于v2<br>
	</c:when>
	<c:otherwise>
		v1大于v2
	</c:otherwise>
</c:choose>

<c:choose>
	<c:when test="${empty v4}">
		v4为淡淡的<br>
		v4:${v4 }
	</c:when>
	<c:otherwise>
		v4不为空<br>
	</c:otherwise>
</c:choose>

<p>
<li>测试循环控制标签for:each</li>
<table border="1">
	<tr>
		<td>姓名</td>
		<td>年龄</td>
		<td>所属组</td>
	</tr>
	<c:choose>
		<c:when test="${empty list}">
			<tr>
				<td colspan="3">没有所要的数据</td>
			</tr>
		</c:when>
		<c:otherwise>
			<c:forEach var="u" items="${list}">
				<tr>
					<td>${u.name }</td>
					<td>${u.age }</td>
					<td>${u.group.name }</td>
				</tr>
			</c:forEach>
		</c:otherwise>
	</c:choose>

<p>
<li>测试循环控制标签for:each,varstatus</li>
<table border="1">
	<tr>
		<td>姓名</td>
		<td>年龄</td>
		<td>所属组</td>
	</tr>
	<c:choose>
		<c:when test="${empty list}">
			<tr>
				<td colspan="3">没有所要的数据</td>
			</tr>
		</c:when>
		<c:otherwise>
			<c:forEach var="u" items="${list}" varStatus="vs">
				<c:choose>
					<c:when test="${vs.count mod 2 ==0}">
						<tr bgcolor="red">
					</c:when>
					<c:otherwise>
						<tr>
					</c:otherwise>
				</c:choose>
					<td>
						<c:out value="${u.name}"></c:out>
					</td>
					<td>
						<c:out value="${u.age}"></c:out>
					</td>
					<td>
						<c:out value="${u.group.name}"></c:out>
					</td>
					</tr>
			</c:forEach>
		</c:otherwise>
	</c:choose>
</table>

<p>
<li>测试循环控制标签，普通循环</li><br>
<c:forEach begin="1" end="10">
	a<br>
</c:forEach>

<p>
<li>测试循环控制标签，输出map</li><br>
<c:forEach items="${map}" var="v">
	${v.key }=${v.value }
</c:forEach>

<p>
<li>c:forToken</li><br>
<c:forTokens items="${tokens}" delims="," var="v">
	${v }<br>
</c:forTokens>

<%
	try{
		Integer.parseInt("adfafw");
	}catch(Exception e){
		out.println(e.getMessage());
	}
 %>
<p>
<li>测试c:catch</li><br>
<c:catch var="exinfo">
<%
	Integer.parseInt("adfafw");
 %>
</c:catch>
${exinfo }<br>

<p>
<li>测试c:url,c:param</li><br>
<c:url value="http://localhost:8092/struts_jstl/index.jsp" var="v">
	<c:param name="age" value="27"></c:param>
	<c:param name="name" value="guchao"></c:param>
</c:url>
${v }<br>