spring mvc 重复提交

MARK:

Spring MVC如何防止重复提交？类似Struts Token机制！
首先，需要将继承了SimpleFormController之类的sessionForm设为true。这样，在显示一个新表单时，Spring会将 command存放在session中，而在提交表单时，Spring会从session中取出此command，随后立即从session中删除存放 command的attribute。如果发现在session中没有command，Spring将其断定为重复提交，转而执行 handleInvalidSubmit(request, response)，可覆盖此方法负责防止重复提交的任务。

可以这么说，当setSessionForm(true)之后，如果没有先后经历显示表单、提交表单的过程，就会被认为是重复提交表单。

http://www.blogjava.net/paulwong/archive/2012/02/20/370375.html

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;


public class FormControl extends SimpleFormController
{


	public FormControl()
	{
		super();
		this.setSessionForm(true);
	}

	@Override
	protected ModelAndView onSubmit(Object command) throws Exception
	{
		
		ModelAndView res = new ModelAndView("form","now",new Date());
		res.addObject("amwu", "28");
		
		return res;
	}

	@Override
	protected ModelAndView handleInvalidSubmit(HttpServletRequest request,
			HttpServletResponse response) throws Exception
	{
		System.out.println("handleInvalidSubmit(request, response)");
		return super.handleInvalidSubmit(request, response);
	}

	@Override
	protected Object formBackingObject(HttpServletRequest request)
			throws Exception
	{
		return request;
	}

	
	
}

<bean id="formControl" class="FormControl"></bean>
	<bean
		class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="mappings">
			<props>
				<prop key="/hello.html">springControl</prop>
				<prop key="/form.html">formControl</prop>
			</props>
		</property>
	</bean>

网上示例：
http://www.blogjava.net/liuwentao253/archive/2007/01/31/96982.html