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Spring3MVC 在JSP中运用@ModelAttribute

日期：2014-05-16　浏览次数：20436 次

Spring3MVC 在JSP中使用@ModelAttribute
在教程中,我们将创建一个简单的Spring3MVC simple CRUD应用程序.

什么是@ModelAttribute

Spring3关于@ModelAttribute的文档

引用

@ModelAttribute has two usage scenarios in controllers. When you place it on a method parameter, @ModelAttribute maps a model attribute to the specific, annotated method parameter (see the processSubmit() method below). This is how the controller gets a reference to the object holding the data entered in the form.

You can also use @ModelAttribute at the method level to provide reference data for the model (see the populatePetTypes() method in the following example). For this usage the method signature can contain the same types as documented previously for the @RequestMapping annotation.

Note
@ModelAttribute annotated methods are executed before the chosen @RequestMapping annotated handler method. They effectively pre-populate the implicit model with specific attributes, often loaded from a database. Such an attribute can then already be accessed through @ModelAttribute annotated handler method parameters in the chosen handler method, potentially with binding and validation applied to it.

大意就是:
当你放置在方法参数,@ModelAttribute模型映射到具体属性;
你也可以使用@ModelAttribute在方法级别上提供参考模型的数据.

英语不好.见谅

根据配合m2eclipse创建一个标准的maven web项目
我们创建一个名为spring-jsp的web项目.并添加图下所示

为了开启SpringMVC,我们需要在web.xml添加以下内容

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

	<servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>spring</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

</web-app>

在web.xml中我们定义servlet:spring.
按照惯例,我们必须声明一个spring-servle.xml
用springIDE插件创建一个配置xml.
内容包含:

spring-servle.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	   		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	<!-- 定义一个视图解析器 -->
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver"
		p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

</beans>

这个XML配置声明一个视图解析器.在控制器中会根据JSP名映射到/ WEB-INF/jsp中相应的位置.

然后创建一个applicationContext.xml.

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	   		http://www.springframework.org/schema/beans/spri

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Spring3MVC 在JSP中运用@ModelAttribute

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