经验13-jsp简单标签案例分析.doc-JavaSript-爱易网页

经验13-jsp简单标签案例分析.doc

日期：2014-05-16　浏览次数：20339 次

心得13--jsp简单标签案例分析.doc

1. 使用标签控制页面逻辑案例：
   模拟sun公司开发的标签
–	开发<c:if>标签
–	开发<c:if><c:else>标签
–	开发迭代标签
开发<c:if>标签案例：
标签控制类：
package com.csdn.web.example;

import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class Demo1 extends SimpleTagSupport {

	private boolean test;
	public void setTest(boolean test) {
		this.test = test;
	}
	@Override
	public void doTag() throws JspException, IOException {
		if(test){			
			JspFragment jf = this.getJspBody();
			jf.invoke(null);
		}
	}
}
Tld描述文档：
<?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>example</short-name>
	<uri>example</uri>

	<tag>
		<name>if</name>
		<tag-class>com.csdn.web.example.Demo1</tag-class>
		<body-content>scriptless</body-content>
		<attribute>
		<name>test</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
	
	<tag>
		<name>choose</name>
		<tag-class>com.csdn.web.example.ChooseTag</tag-class>
		<body-content>scriptless</body-content>
	</tag>
	<tag>
		<name>when</name>
		<tag-class>com.csdn.web.example.WhenTag</tag-class>
		<body-content>scriptless</body-content>
		<attribute>
		<name>test</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
	<tag>
		<name>otherwise</name>
<tag-class>com.csdn.web.example.OtherwiseTag</tag-class>
		<body-content>scriptless</body-content>
	</tag>
	
	<tag>
		<name>forEach</name>
		<tag-class>com.csdn.web.example.ForEach</tag-class>
		<body-content>scriptless</body-content>
		<attribute>
		<name>var</name>
		<required>true</required>
		</attribute>
		<attribute>
		<name>items</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
</taglib>
JSP文件：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="example"  prefix="example"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP '1.jsp' starting page</title>
    
  </head>
  
  <body>
    <example:if test="${ user==null}">
    <h5>aaaaaaaaaaa</h5>
    </example:if>
  </body>
</html>
开发迭代（forEach）标签
标签控制类：
package com.csdn.web.example;

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 ForEach extends SimpleTagSupport {

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

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

	@Override
	public void doTag() throws JspException, IOException {
		Iterator it = items.iterator();
		while(it.hasNext()){
			Object obj = it.next();
			this.getJspContext().setAttribute(var,obj);
			this.getJspBody().invoke(null);
		}
	}
}
JSP文件：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="examp

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经验13-jsp简单标签案例分析.doc

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