动态表单(DynamicForm)

当表单类的属性个数和类型不能确定的时候, 就可以使用动态表单来解决
普通表单和动态表单的区别:
1. 普通表单ActionForm, 首先要定义一个这样的类, 然后配置到struts-config.xml中
2. 动态表单完全依赖于反射机制, 所以不需要创建表单类, 直接在struts-config.xml中配置即可.

项目结构:

index.jsp:

<jsp:forward page="/WEB-INF/register.jsp" />

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version="2.5">

   <servlet>
       <servlet-name>action</servlet-name>
       <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
       <init-param>
           <param-name>config</param-name>
           <param-value>/WEB-INF/struts-config.xml</param-value>
       </init-param>
   </servlet>
   <servlet-mapping>
       <servlet-name>action</servlet-name>
       <url-pattern>*.do</url-pattern>
   </servlet-mapping>
</web-app>
struts-config.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>
   
   <form-beans>
       <form-bean name="userForm" type="org.apache.struts.action.DynaActionForm">
           <form-property name="username" type="java.lang.String" />
           <form-property name="password" type="java.lang.String" />
           <form-property name="email" type="java.lang.String" />

<form-property name="telephone" type="java.lang.String" />
       </form-bean>
   </form-beans>
   <action-mappings>
       <action path="/register" name="userForm"
               parameter="flag" type="com.itcast.struts1.action.RegisterAction">
           <forward name="registerOk" path="/WEB-INF/registerOk.jsp" />
       </action>
   </action-mappings>
</struts-config>

register.jsp:

<body>
   <h3>用户注册</h3>
   <form action="<%=basePath%>register.do?flag=register" method="post">
       u: <input type="text" name="username"/><br/>
        p: <input type="password" name="password"/><br/>
        e: <input type="text" name="email"/><br/>

t: <input type="text" name="telephone"/><br/>
        <input type="submit" value="Register"/>
   </form>
</body>

RegisterAction.java:

public class RegisterAction extends DispatchAction {

   public ActionForward register(ActionMapping mapping, ActionForm form,
           HttpServletRequest request, HttpServletResponse response) throws Exception {

       DynaActionForm dynaActionForm = (DynaActionForm) form;
       String username = (String) dynaActionForm.get("username");
       String password = (String) dynaActionForm.get("password");
       String email = (String) dynaActionForm.get("email");

　　// 动态表单的意思是可以在这里动态添加属性
       String telephone = (String) dynaActionForm.get("telephone");

       System.out.println("username: " + username + " | "
               + "password: " + password + " | "
               + "email: " + email
               + "telephone: " + telephone);

       return mapping.findForward("registerOk");
   }

}

registerOk.jsp:

测试:

posted @ 2017-03-09 13:30 半生戎马，共话桑麻、阅读(3003) 评论(0) 收藏举报

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动态表单(DynamicForm)

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