一口一口吃掉Struts（五）——测试Struts标签库
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：
下篇继续……