菜鸟学习Struts——bean标签库

时间：2022-10-19 05:34:21

一、Struts标签库。

Struts实际上包含了4个标签库：bean，logic，html，tiles

bean：用来在属性范围中定义或取得属性的，同时可以读取资源文件信息

logic：替代JSTL中的判断和循环

html：替代页面表单，完成自动回填以及错误信息的显示

tiles：美工标签，用来进行页面布局的调整以及样式管理的。

二、各个标签库的实例

下面利用实例来为大家降解三个标签库： beanwrite标签库、logic标签库、iterate标签库

2.1 beanwrite标签

实现效果：

菜鸟学习Struts——bean标签库

代码：

2.1.1、配置Struts环境

2.1.2、编写bean_write.jsp

	<%@ page language="java" contentType="text/html; charset=GB18030"

	    pageEncoding="GB18030"%>

	<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

	<!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=GB18030">

	<title>Insert title here</title>

	</head>

	<body>

		<h1>测试beanWrite标签</h1><br>

		<hr>

		 <li>普通字符串</li><br>

		 hello(标签):<bean:write name="hello"/>

		 <p>

		 <li>html文本</li><br>

		 bj(default):<bean:write name="bj"/>

		 <br>

		 bj(filter:"true"):<bean:write name="bj" filter="true"/>

		 <br>

		 bj(filter:"false"):<bean:write name="bj" filter="false"/>

		<p>

		<li>user</li><br>

		姓名：<input type="text" name="username" value="<bean:write name='user' property='username'/>"><br>

		年龄：<input type="text" name="age" value="<bean:write name='user' property='age'/>"><br>

		所属组：<input type="text" name="group" value="<bean:write name='user' property='group.name'/>"><br>

	</body>

	</html>

2.1.3、编写BeanWriteTestAction.java

	package com.bjpowernode.struts;

	import java.util.Date;

	import javax.servlet.http.HttpServletRequest;

	import javax.servlet.http.HttpServletResponse;

	import org.apache.struts.action.Action;

	import org.apache.struts.action.ActionForm;

	import org.apache.struts.action.ActionForward;

	import org.apache.struts.action.ActionMapping;

	/**

	 * 测试beanWrite标签

	 * @author IT

	 *

	 */

	public class BeanWriteTestAction extends Action {

		@Override

		public ActionForward execute(ActionMapping mapping, ActionForm form,

				HttpServletRequest request, HttpServletResponse response)

				throws Exception {

			//普通字符串

			request.setAttribute("hello", "helloword");

			//html文本

			request.setAttribute("bj", "<font color='red'>北京欢迎你</font>");

			//日期

			request.setAttribute("today",new Date());

			Group group=new Group();

			group.setName("动力节点");

			User user=new User();

			user.setUsername("张三");

			user.setAge(22);

			user.setGroup(group);

			request .setAttribute("user", user);

			return mapping.findForward("success");

		}

	}

2.1.4、编写实体类

User.java

	package com.bjpowernode.struts;

	/**

	 * User实体

	 * @author IT

	 *

	 */

	public class User {

		//用户名字

		private String username;

		//年龄

		private int age;

		//组

		private Group group;

		public String getUsername() {

			return username;

		}

		public void setUsername(String username) {

			this.username = username;

		}

		public int getAge() {

			return age;

		}

		public void setAge(int age) {

			this.age = age;

		}

		public Group getGroup() {

			return group;

		}

		public void setGroup(Group group) {

			this.group = group;

		}

	}

Group.java

	package com.bjpowernode.struts;

	/**

	 * 组的实体类

	 * @author IT

	 *

	 */

	public class Group {

		//组名

		private String name;

		public String getName() {

			return name;

		}

		public void setName(String name) {

			this.name = name;

		}

	}

2.1.5、struts-config.xml配置

	<?xml version="1.0" encoding="ISO-8859-1" ?>

	<!DOCTYPE struts-config PUBLIC

	          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"

	          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

	<struts-config>

		<action-mappings>

			<action path="/beanwrite"

					type="com.bjpowernode.struts.BeanWriteTestAction"

			>

				<forward name="success" path="/bean_write.jsp"></forward>

			</action>

		</action-mappings>

	</struts-config>

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