一口一口吃掉Struts（五）——测试Struts标签库

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Struts标签库的使用和JSTL标签库使用方式类似。

认识可以了，建议熟练掌握JSTL标签库。struts标签库基本认识就可以了。

核心操作：

配置：
* 配置国际化支持，在struts-config.xml文件中加入如下配置：
<message-resources parameter="MessageResources" />
* 最好提供国际化资源文件（MessageResources.properties），将该文件放到src下

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

测试代码：

ACTION

package com.jialin;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

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;

public class TestAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		//普通字符串
		request.setAttribute("hello", "helloworld");
		//html文本
		request.setAttribute("world", "<font color='red'>Hello World!</font>");
		//日期
		request.setAttribute("today", new Date());
		//数字
		request.setAttribute("number", 12345.1234);
		
		Group group = new Group();
		group.setName("师院");
		
		User user = new User();
		user.setUsername("张三");
		user.setAge(18);
		user.setGroup(group);
		//结构数据
		request.setAttribute("user", user);
		
		//空
		request.setAttribute("attr1", null);
		request.setAttribute("attr2", "");
		request.setAttribute("attr3", new ArrayList());
		
	
		//List
		List userList = new ArrayList();
		
		for (int i=0; i<10; i++) {
			User user1 = new User();
			user1.setUsername("张三_" + i);
			user1.setAge(18 + i);
			user1.setGroup(group);
			
			userList.add(user1);
		}
		
		request.setAttribute("userlist", userList);
		
		return mapping.findForward("showresult");
	}

}

User

package com.jialin;

public class User {

	private String username;
	
	private int age;
	
	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

package com.jialin;

public class Group {

	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

JSP

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>     
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>      

    
<!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>
	<li>普通字符串</li><br>
hello(标签):<bean:write name="hello"/>
<p></p>
	<li>html文本</li><br>
world(default):<bean:write name="world"/><br/>
world(filter true):<bean:write name="world" filter="true"/><br/>
world(filter false):<bean:write name="world" filter="false"/>
<p>
	<li>格式化日期</li><br>
	today(default):<bean:write name="today"/><br>
	today(format="yyyy-MM-dd HH:mm:ss"):<bean:write name="today" format="yyyy-MM-dd HH:mm:ss"/>
	<p>
	<li>格式化数字</li><br>
	n(default):<bean:write name="number"/><br>
	n(format="###,###.#####"):<bean:write name="number" format="###,###.#####"/><br>
	n(format="###,###.00000"):<bean:write name="number" format="###,###.00000#"/><br>
	<P>
	<li>结构</li><br>
	姓名：<input type="text" name="username" value="<bean:write name="user" property="username"/>"> <br>
	年龄：<input type="text" name="userage" value="<bean:write name="user" property="age"/>"> <br>
	所属组：<input type="text" name="usergroup" value="<bean:write name="user" property="group.name"/>"> <br>
	<h1>测试logic:empty,logic:notEmpty,logic:present,logic:notPresent</h1>
	<hr>
	<logic:empty name="attr1">
		atrr1为空<br>
	</logic:empty>
	<logic:notEmpty name="attr1">
		atrr1不为空<br>
	</logic:notEmpty>
	<logic:present name="attr1">
		atrr1存在<br>
	</logic:present>
	<logic:notPresent name="attr1">
		atrr1不存在<br>
	</logic:notPresent>
	<p>
	<logic:empty name="attr2">
		atrr2为空<br>
	</logic:empty>
	<logic:notEmpty name="attr2">
		atrr2不为空<br>
	</logic:notEmpty>
	<logic:present name="attr2">
		atrr2存在<br>
	</logic:present>
	<logic:notPresent name="attr2">
		atrr2不存在<br>
	</logic:notPresent>
	<p>
	<logic:empty name="attr3">
		atrr3为空<br>
	</logic:empty>
	<logic:notEmpty name="attr3">
		atrr3不为空<br>
	</logic:notEmpty>
	<logic:present name="attr3">
		atrr3存在<br>
	</logic:present>
	<logic:notPresent name="attr3">
		atrr3不存在<br>
	</logic:notPresent>
	<p>
	
	<h1>测试迭代标签</h1>
	<hr>
	<table border="1">
		<tr>
			<td>姓名</td>
			<td>年龄</td>
			<td>所属组</td>
		</tr>
		<logic:empty name="userlist">
			<tr>
				<td colspan="3">没有符合条件的数据</td>
			</tr>
		</logic:empty>
		<logic:notEmpty name="userlist">
			<logic:iterate id="user" name="userlist">
				<tr>
					<td>
						<bean:write name="user" property="username"/>
					</td>
					<td>
						<bean:write name="user" property="age"/>
					</td>
					<td>
						<bean:write name="user" property="group.name"/>
					</td>
				</tr>
			</logic:iterate>
		</logic:notEmpty>
	</table>
</body>
</html>

测试结果：