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：