l priceIncreaseForm Bean定义表单对应的控制器：
Ø sessionForm：是否启用session
Ø commandName：Command对象名，在Spring标记中引用
Ø commandClass：Command对象的类全路径
Ø validator：验证器类全路径
Ø formView：表单视图页面
Ø successView：表单提交成功后显示的视图页面（译者：这里不能使用逻辑名字）
l 表单控制器扩展SimpleFormController，主要处理是onSubmit()方法，其参数是指定的Command对象，以便获得表单提交的数据，然后调用ProductManager的increasePrice()方法增加价格，最后重定向到successView
package web;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;
import java.util.HashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import bus.ProductManager;
import bus.PriceIncrease;
public class PriceIncreaseFormController extends SimpleFormController {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private ProductManager prodMan;
public ModelAndView onSubmit(Object command)
throws ServletException {
int increase = ((PriceIncrease) command).getPercentage();
logger.info("Increasing prices by " + increase + "%.");
prodMan.increasePrice(increase);
String now = (new java.util.Date()).toString();
logger.info("returning from PriceIncreaseForm view to " + getSuccessView() +
" with " + now);
Map myModel = new HashMap();
myModel.put("now", now);
myModel.put("products", getProductManager().getProducts());
return new ModelAndView(new RedirectView(getSuccessView()));
}
protected Object formBackingObject(HttpServletRequest request) throws ServletException {
PriceIncrease priceIncrease = new PriceIncrease();
priceIncrease.setPercentage(20);
return priceIncrease;
}
public void setProductManager(ProductManager pm) {
prodMan = pm;
}
public ProductManager getProductManager() {
return prodMan;
}
}
l formBackingObject()方法是回传数据到表单，最后返回的是Command对象
l 在messages.properties中，加入本例使用的一些消息：
title=SpringApp
heading=Hello :: SpringApp
greeting=Greetings, it is now
priceincrease.heading=Price Increase :: SpringApp
error.not-specified=Percentage not specified!!!
error.too-low=You have to specify a percentage higher than {0}!
error.too-high=Don't be greedy - you can't raise prices by more than {0}%!
required=Entry required.
typeMismatch=Invalid data.
typeMismatch.percentage=That is not a number!!!
l 同时也在hello.jsp中添加到priceincrease.jsp的链接
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<html>
<head><title><fmt:message key="title"/></title></head>
<body>
<h1><fmt:message key="heading"/></h1>
<p><fmt:message key="greeting"/> <c:out value="${model.now}"/>
</p>
<h3>Products</h3>
<c:forEach items="${model.products}" var="prod">
<c:out value="${prod.description}"/> <i>$<c:out value="${prod.price}"/></i><br><br>
</c:forEach>
<br>
<a href="<c:url value="priceincrease.htm"/>">Increase Prices</a>
<br>
</body>
</html>
l 重新部署程序，就可以测试你的程序了