Jsp Tag

 

 

package tags;

import java.util.Collection;
import java.util.Iterator;

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

public class IteratorTag extends TagSupport {

	private String var;
	private Collection items;
	private Iterator iter;
	
	public String getVar() {
		return var;
	}

	public void setVar(String var) {
		this.var = var;
	}

	public Collection getItems() {
		return items;
	}

	public void setItems(Collection items) {
		this.items = items;
	}

	@Override
	public int doStartTag() throws JspException {
		iter=items.iterator();
		if(iter.hasNext()){
			this.pageContext.setAttribute(var, iter.next());
			return this.EVAL_BODY_INCLUDE;
		}
		return this.SKIP_BODY;
	}

	@Override
	public int doAfterBody() throws JspException {
		if(iter.hasNext()){
			this.pageContext.setAttribute(var, iter.next());
			return this.EVAL_BODY_AGAIN;
		}
		return this.SKIP_BODY;
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
                        "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
	<tlib-version>1.0</tlib-version>
	<jsp-version>1.2</jsp-version>
	<short-name>custom_dt</short-name>
	<uri>/myCustomTags</uri>
	<display-name>我的自定义</display-name>
	<description>这是我的自定义标签，用于测试</description>

	<tag>
		<name>MyIteratorTag</name>
		<tag-class>tags.IteratorTag</tag-class>
		<body-content>JSP</body-content>
		<display-name>测试的</display-name>
		<description>自定义的迭代标签</description>
		<attribute>
			<name>var</name>
			<required>true</required>
			<rtexprvalue>false</rtexprvalue>
			<description>变量名</description>
		</attribute>
		<attribute>
			<name>items</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
			<description>用于iterate的集合</description>
		</attribute>
	</tag>
</taglib>