jsp中建立一個帶標籤體的迭代器標籤

最後更新：2017-01-13 來源：互聯網

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1.定義迭代器標籤處理類：

代碼如下

複製代碼

package mckee;

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

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

public class IteratorTag extends SimpleTagSupport
{
//指定集合
private String collection;
//指定集合元素
private String item;
//getter 和 setter
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;
}
public void doTag() throws JspException, IOException
{
  //擷取集合
  Collection itemList = (Collection) getJspContext().getAttribute(collection);
  //遍曆集合
  for(Object s : itemList)
  {
   //將集合元素設定到page範圍
   getJspContext().setAttribute(item, s);
   //輸出標籤體
   getJspBody().invoke(null);
  }
}
}

2.建立tld檔案

代碼如下

複製代碼

<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <tlib-version>1.0</tlib-version>
    <short-name>mytag</short-name>
    <uri>/mytag</uri>
    <tag>
    <name>iterator</name>
    <tag-class>mckee.IteratorTag</tag-class>
    <body-content>scriptless</body-content>
    
    <attribute>
      <name>collection</name>
      <required>true</required>
      <fragment>true</fragment>
    </attribute>
    <attribute>
      <name>item</name>
      <required>true</required>
      <fragment>true</fragment>
    </attribute>
    </tag>

</taglib>

2.建立tld檔案

代碼如下

複製代碼

3.在jsp頁面中測試標籤

代碼如下

複製代碼

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ taglib uri="/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>powered by http://www.111cn.net</title>
</head>
<body>
<%
List<String> arr = new ArrayList<String>();
arr.add("java教程");
arr.add("http://www.111cn.net");
pageContext.setAttribute("arr",arr);
%>
<mytag:iterator collection="arr" item="item">
${pageScope.item}<br>
</mytag:iterator>
</body>
</html>

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