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>

自定义标签——带标签体

带标签体自定义标签

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