6.Struts2模型驱动实例

如果一个动作实现了“模型驱动”- ModelDriven 接口，它就获得了表单数据自动传输到对象的额外能力。请参见下面的完整的例子：

1. 域对象

一个顾客(customer)对象，有 setter 和 getter 方法。

Customer.java

package com.yiibai.common;

public class Customer{
	
	String name;
	int age;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}

}

2. 动作 - Action

Action类，实现了模型驱动ModelDriven 接口，声明getModel()方法返回客户的对象。当表单数据提交到这个动作，它会自动将表单数据传输到客户的属性。

客户对象必须手动初始化。

CustomerAction.java

package com.yiibai.common.action;

import com.yiibai.common.Customer;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
 
public class CustomerAction extends ActionSupport 
	implements ModelDriven{

	//have to initialize it
	Customer customer = new Customer();
	
	public String execute() throws Exception {
	
		return SUCCESS;
		
	}

	public Object getModel() {
		
		return customer;
		
	}
}

3. JSP页面

JSP页面的模型驱动(ModelDriven)的示范。

addCustomer.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
</head>
 
<body>
<h1>Struts 2 ModelDriven example</h1>

<h2>Add Customer</h2>
<s:form  action="customerAction" >
  <s:textfield name="name" label="Name" />
  <s:textfield name="age" label="Age" value=""/>
  <s:submit />
</s:form>

</body>
</html>

success.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
</head>
 
<body>
<h1>Struts 2 ModelDriven example</h1>

<h2>Customer Details</h2>
Name : <s:property value="name" /><br>
Age : <s:property value="age" /><br>

</body>
</html>

4. struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 	<constant name="struts.devMode" value="true" />
 	
	<package name="default" namespace="/" extends="struts-default">
		
		<action name="addCustomerAction" 
			class="com.yiibai.common.action.CustomerAction" >
		    <result name="success">pages/addCustomer.jsp</result>
		</action>
	
		<action name="customerAction" 
			class="com.yiibai.common.action.CustomerAction" >
		    <result name="success">pages/success.jsp</result>
		</action>
		
	</package>
	
</struts>

5. 示例

访问客户表，填写表格 (name : “yiibai.com”, age ” “26”) 并点击提交按钮，表单数据(name & age) 将自动转移到客户的属性(name & age) (按属性名称匹配)。

http://localhost:8080/struts2-modeldrive/addCustomerAction.action

http://localhost:8080/struts2-modeldrive/customerAction.action

posted on 2016-06-12 16:16 Sharpest 阅读(270) 评论(0) 编辑收藏举报