jsp taglib

最新推荐文章于 2022-12-04 18:37:05 发布

原创最新推荐文章于 2022-12-04 18:37:05 发布 · 237 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用JavaServer Pages (JSP) 创建自定义标签的示例，包括UserInfo类用于存储用户信息，以及UserInfoTag类实现标签功能，通过在JSP页面中调用展示用户详细资料。

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D:\Eclipse-jee-luna-SR2-win32-x86_64_workspace\PrjHtml5\src\control\UserInfo.java

package control;

public class UserInfo
{
//	http://www.cnblogs.com/zhaoyang/archive/2011/12/25/2301108.html
	private String userName;
	private String age;
	private String email;

	public String getUserName()
	{
		return userName;
	}

	public void setUserName(String userName)
	{
		this.userName = userName;
	}

	public String getAge()
	{
		return age;
	}

	public void setAge(String age)
	{
		this.age = age;
	}

	public String getEmail()
	{
		return email;
	}

	public void setEmail(String email)
	{
		this.email = email;
	}
}

D:\Eclipse-jee-luna-SR2-win32-x86_64_workspace\PrjHtml5\src\control\UserInfoTag.java

package control;

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

/**
 * 
 * @author ZengWenFeng
 */
public class UserInfoTag extends TagSupport
{
	private static final long serialVersionUID = 1L;

	private UserInfo user;//
	private String code;

	public int doStartTag() throws JspException
	{
		try
		{
			JspWriter out = this.pageContext.getOut();

			if (user == null)
			{
//				out.println("No UserInfo Found...");
//				return SKIP_BODY;
				
				user = new UserInfo();
				user.setAge("3");
				user.setEmail("ddd@eee");
				user.setUserName("zengwenfeng");
			}

			out.println("<table width='500px' border='1' align='center'>");

			out.println("<tr>");
			out.println("<td width='20%'>Username:</td>");
			out.println("<td>" + user.getUserName() + "</td>");
			out.println("</tr>");

			out.println("<tr>");
			out.println("<td>Age:</td>");
			out.println("<td>" + user.getAge() + "</td>");
			out.println("</tr>");

			out.println("<tr>");
			out.println("<td>Email:</td>");
			out.println("<td>" + user.getEmail() + "</td>");
			out.println("</tr>");
			
			out.println("<tr>");
			out.println("<td>code:</td>");
			out.println("<td>" + getCode() + "</td>");
			out.println("</tr>");
			out.println("</table>");
		}
		catch (Exception e)
		{
			throw new JspException(e.getMessage());
		}

		return SKIP_BODY;
	}

	public int doEndTag() throws JspException
	{
		return EVAL_PAGE;
	}

	public void release()
	{
		super.release();
		this.user = null;
	}

	//
	public String getCode()
	{
		return code;
	}

	public void setCode(String code)
	{
		this.code = code;
	}

	public UserInfo getUser()
	{
		return user;
	}

	public void setUser(UserInfo user)
	{
		this.user = user;
	}
}

D:\Eclipse-jee-luna-SR2-win32-x86_64_workspace\PrjHtml5\WebContent\WEB-INF\mytaglib.tld

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" 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 web-jsptaglibrary_2_0.xsd">
	<tlib-version>1.0</tlib-version>
	<jsp-version>2.0</jsp-version>
	<short-name>cc</short-name>
	<uri>/mytaglib</uri>
	<tag>
		<name>showUserInfo</name>
		<tag-class>control.UserInfoTag</tag-class>
		<body-content>empty</body-content>
		
		<attribute>
			<name>code</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>user</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
</taglib>

D:\Eclipse-jee-luna-SR2-win32-x86_64_workspace\PrjHtml5\WebContent\WEB-INF\web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>PrjHtml5</display-name>

	<jsp-config>
		<taglib>
			<taglib-uri>/mytaglib</taglib-uri>
			<taglib-location>/WEB-INF/mytaglib.tld</taglib-location>
		</taglib>
	</jsp-config>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>

D:\Eclipse-jee-luna-SR2-win32-x86_64_workspace\PrjHtml5\WebContent\NewFile.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="/mytaglib" prefix="cc"%>
<!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>
</head>
<body>
<cc:showUserInfo/>
<cc:showUserInfo />
</body>
</html>