自定义标签——带标签体

带标签体自定义标签

步骤：和前面的没区别
创建自定义标签类：

package taglibclass;

import java.io.IOException;
import java.util.Collection;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class BodyTag extends SimpleTagSupport {
	private String collection;
	private String item;
	
	@SuppressWarnings("unchecked")
	@Override
	public void doTag() throws JspException, IOException {
		Collection<String> itemList = (Collection<String>)getJspContext().getAttribute(collection);
		for (String string : itemList) {
			getJspContext().setAttribute(item, string);
			getJspBody().invoke(null);
		}
	}
	public String getCollection() {
		return collection;
	}
	public void setCollection(String collection) {
		this.collection = collection;
	}
	public String getItem() {
		return item;
	}
	public void setItem(String item) {
		this.item = item;
	}
	
}

配置自定义标签

<tag>
		<name>bodyTag</name>
		<tag-class>taglibclass.BodyTag</tag-class>
<!--有属性的自定义标签相比，只是该标签值由empty改为scriptless-->
		<body-content>scriptless</body-content>
		<attribute>
		<name>collection</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>item</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		
	</tag>

使用标签：

<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib uri="mytaglib/mytag" prefix="mytag"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>bodyTag</title>
</head>
<body>
	<h2>带标签体的标签-迭代器标签</h2>
	<%
		List<String> a = new ArrayList<String>();
		a.add("java");
		a.add("hello taglib");
		a.add("sysker");
		pageContext.setAttribute("a", a);
	%>
	<table border="1">
		<mytag:bodyTag collection="a" item="item">
			<tr>
				<td>${pageScope.item}</td>
			</tr>
		</mytag:bodyTag>
	</table>
</body>
</html>