使用IterateSimpleTag实现JSP迭代-优快云博客

本文介绍如何在JSP中利用IterateSimpleTag实现数据迭代展示，包括其核心代码实现和示例应用。

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IterateSimpleTag.java

package com.ruanku.tag;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

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

public class IterateSimpleTag extends SimpleTagSupport {


	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	private String var;
	private String items;
	
	public String getVar() {
		return var;
	}

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

	public String getItems() {
		return items;
	}

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

	@Override
	public void doTag() throws JspException, IOException {
		Object value=this.getJspContext().getAttribute(items);
		if(value!=null&&value instanceof List){
			Iterator iter=((List)value).iterator();
			while(iter.hasNext()){
				this.getJspContext().setAttribute(var, iter.next());
				this.getJspBody().invoke(null);//响应页面
			}
		}
		super.doTag();
	}



	
	

}

cc.tld

<tag>
		<name>iterate2</name>
		<tag-class>com.ruanku.tag.IterateSimpleTag</tag-class>
		<body-content>scriptless</body-content>
		<attribute>
			<name>var</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>items</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>

iterateSimpleTag.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ page import="java.util.*" %>
<%@ taglib prefix="cc" uri="/WEB-INF/cc.tld" %>
<!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>Insert title here</title>
<%
	List people=new ArrayList();
	people.add("陈晨2");
	people.add("大爷你好2");
	pageContext.setAttribute("people", people);
%>
</head>
<body>
<cc:iterate2 items="people" var="p">
	<h2>${p }</h2>
</cc:iterate2>
</body>
</html>

需要注意的地方

public class IterateSimpleTag extends SimpleTagSupport {

	while(iter.hasNext()){
				this.getJspContext().setAttribute(var, iter.next());
				this.getJspBody().invoke(null);//响应页面
			}

<body-content>scriptless</body-content>

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