16. 增加商业逻辑类
为了分开Web逻辑和商业逻辑，我们建立两个不同的包，web和bus
springapp/src/bus/Product.java
| package bus; import java.io.Serializable; public class Product implements Serializable { private String description; private Double price; public void setDescription(String s) { description = s; } public String getDescription() { return description; } public void setPrice(Double d) { price = d; } public Double getPrice() { return price; } } |
springapp/src/bus/ProductManager.java
| package bus; import java.io.Serializable; import java.util.List; public class ProductManager implements Serializable { private List products; public void setProducts(List p) { products = p; } public List getProducts() { return products; } } |
修改SpringappController.java
springapp/src/web/SpringappController.java
| package web; import org.springframework.web.servlet.mvc.Controller; import org.springframework.web.servlet.ModelAndView; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Map; import java.util.HashMap; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import bus.Product; import bus.ProductManager; public class SpringappController implements Controller { /** Logger for this class and subclasses */ protected final Log logger = LogFactory.getLog(getClass()); private ProductManager prodMan; public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String now = (new java.util.Date()).toString(); logger.info("returning hello view with " + now); Map myModel = new HashMap(); myModel.put("now", now); myModel.put("products", getProductManager().getProducts()); return new ModelAndView("hello", "model", myModel); } public void setProductManager(ProductManager pm) { prodMan = pm; } public ProductManager getProductManager() { return prodMan; } } |
17. 修改View以便显示商业数据，增加对message bundle的支持
springapp/war/WEB-INF/jsp/hello.jsp
| ＜%@ 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＞ ＜/body＞ ＜/html＞ |
18. 增加一些测试数据
我们现在还不打算增加代码，从数据库装载商业对象。我们只springapp-servlet.xml中增加bean和messageSource设置，提供一些测试数据和对messages resource bundle的支持。
springapp/war/WEB-INF/springapp-servlet.xml
| ＜?xml version="1.0" encoding="UTF-8"?＞ ＜!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"＞ ＜!-- - Application context definition for "springapp" DispatcherServlet. --＞ ＜beans＞ ＜bean id="springappController" class="web.SpringappController"＞ ＜property name="productManager"＞ ＜ref bean="prodMan"/＞ ＜/property＞ ＜/bean＞ ＜bean id="prodMan" class="bus.ProductManager"＞ ＜property name="products"＞ ＜list＞ ＜ref bean="product1"/＞ ＜ref bean="product2"/＞ ＜ref bean="product3"/＞ ＜/list＞ ＜/property＞ ＜/bean＞ ＜bean id="product1" class="bus.Product"＞ ＜property name="description"＞＜value＞Lamp＜/value＞＜/property＞ ＜property name="price"＞＜value＞5.75＜/value＞＜/property＞ ＜/bean＞ ＜bean id="product2" class="bus.Product"＞ ＜property name="description"＞＜value＞Table＜/value＞＜/property＞ ＜property name="price"＞＜value＞75.25＜/value＞＜/property＞ ＜/bean＞ ＜bean id="product3" class="bus.Product"＞ ＜property name="description"＞＜value＞Chair＜/value＞＜/property＞ ＜property name="price"＞＜value＞22.79＜/value＞＜/property＞ ＜/bean＞ ＜bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"＞ ＜property name="basename"＞＜value＞messages＜/value＞＜/property＞ ＜/bean＞ ＜bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"＞ ＜property name="mappings"＞ ＜props＞ ＜prop key="/hello.htm"＞springappController＜/prop＞ ＜/props＞ ＜/property＞ ＜/bean＞ ＜bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"＞ ＜property name="viewClass"＞＜value＞org.springframework.web.servlet.view.JstlView＜/value＞＜/property＞ ＜property name="prefix"＞＜value＞/WEB-INF/jsp/＜/value＞＜/property＞ ＜property name="suffix"＞＜value＞.jsp＜/value＞＜/property＞ ＜/bean＞ ＜/beans＞ |
