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……