웹 인터페이스의 개발
1. Controller에 비즈니스 로직 reference 추가
기존에 만든 HelloController를 좀 더 제대로 된 이름으로 변경하자.
그 이름은 InventoryController.
HelloController는 InventoryController로, HelloControllerTests는 InventoryControllerTests로
변경한다.
InventoryController를 날자와 Product List를 가진 Map을 리턴하도록 수정한다.
src/springapp/web/InventoryController.java
package springapp.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 springapp.service.ProductManager;
public class InventoryController implements Controller {
protected final Log logger = LogFactory.getLog(getClass());
private ProductManager productManager;
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<String, Object> myModel = new HashMap<String, Object>();
myModel.put("now", now); myModel.put("products", this.productManager.getProducts());
return new ModelAndView("hello", "model", myModel); }
public void setProductManager(ProductManager productManager) { this.productManager = productManager;
}
}
test/springapp/web/InventoryControllerTests.java
package springapp.web;
import java.util.Map;
import org.springframework.web.servlet.ModelAndView;
import springapp.service.SimpleProductManager;
import springapp.web.InventoryController;
import junit.framework.TestCase;
public class InventoryControllerTests extends TestCase {
public void testHandleRequestView() throws Exception{ InventoryController controller = new InventoryController();
controller.setProductManager(new SimpleProductManager());
ModelAndView modelAndView = controller.handleRequest(null, null);
assertEquals("hello", modelAndView.getViewName()); assertNotNull(modelAndView.getModel());
Map modelMap = (Map) modelAndView.getModel().get("model"); String nowValue = (String) modelMap.get("now"); assertNotNull(nowValue);
}
}
2. Message bundle 지원과 비즈니스 데이터의 display를 위해 view를 수정
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>
3. 비즈니스 객체와 테스트 데이터를 추가
war/WEB-INF/springapp-servlet.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<!-- the application context definition for the springapp DispatcherServlet -->
<bean id="productManager" class="springapp.service.SimpleProductManager">
<property name="products">
<list>
<ref bean="product1"/>
<ref bean="product2"/>
<ref bean="product3"/>
</list>
</property>
</bean>
<bean id="product1" class="springapp.domain.Product">
<property name="description" value="Lamp"/>
<property name="price" value="5.75"/>
</bean>
<bean id="product2" class="springapp.domain.Product">
<property name="description" value="Table"/>
<property name="price" value="75.25"/>
</bean>
<bean id="product3" class="springapp.domain.Product">
<property name="description" value="Chair"/>
<property name="price" value="22.79"/>
</bean>
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="messages"/>
</bean>
<bean name="/hello.htm" class="springapp.web.InventoryController">
<property name="productManager" ref="productManager"/>
</bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
4. Message bundle 와 clean 타켓 추가
war/WEB-INF/classes 아래에 messages.properties를 생성한다.
war/WEB-INF/classes/messages.properties
title=SpringApp
heading=Hello :: SpringApp
greeting=Greetings, it is now
소스 파일이름이 변경되었으므로, clean 과 undeploy 타겟을 build에 추가한다.
build.xml
<target name="clean" description="Clean output directories">
<delete>
<fileset dir="${build.dir}"> <include name="**/*.class"/>
</fileset>
</delete>
</target>
<target name="undeploy" description="Un-Deploy application">
<delete>
<fileset dir="${deploy.path}/${name}"> <include name="**/*.*"/>
</fileset>
</delete>
</target>
톰캣을 stop시키고, clean, undeploy, deploy를 차례로 실행하고, 톰캣을
start하면 된다.
5. form의 추가
form을 위해서 spring-framework-2.5/dist/resources/spring-form.tld 를
war/WEB-INF/tld 에 복사한다.
Web.xml에 <taglib/>를 추가한다.
war/WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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>springapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springapp</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>/spring</taglib-uri>
<taglib-location>/WEB-INF/tld/spring-form.tld</taglib-location>
</taglib>
</jsp-config>
</web-app>
태그 라이브러리를 적용한 priceincrease.jsp를 war/WEB-INF/jsp디렉토리에
생성한다.
springapp/war/WEB-INF/jsp/priceincrease.jsp
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<title><fmt:message key="title"/></title>
<style>
.error { color: red; } </style>
</head>
<body>
<h1><fmt:message key="priceincrease.heading"/></h1>
<form:form method="post" commandName="priceIncrease">
<table width="95%" bgcolor="f8f8ff" border="0" cellspacing="0" cellpadding="5">
<tr>
<td align="right" width="20%">Increase (%):</td>
<td width="20%">
<form:input path="percentage"/>
</td>
<td width="60%">
<form:errors path="percentage" cssClass="error"/>
</td>
</tr>
</table>
<br>
<input type="submit" align="center" value="Execute">
</form:form>
<a href="<c:url value="hello.htm"/>">Home</a>
</body>
</html>
간단한 javaBean class를 만든다.
springapp/src/springapp/service/PriceIncrease.java
package springapp.service;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncrease {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private int percentage;
public void setPercentage(int i) { percentage = i;
logger.info("Percentage set to " + i); }
public int getPercentage() { return percentage;
}
}
체크할 Validator 클래스를 만든다.
src/springapp/service/PriceIncreaseValidator.java
package springapp.service;
import org.springframework.validation.Validator;
import org.springframework.validation.Errors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncreaseValidator implements Validator { private int DEFAULT_MIN_PERCENTAGE = 0;
private int DEFAULT_MAX_PERCENTAGE = 50;
private int minPercentage = DEFAULT_MIN_PERCENTAGE;
private int maxPercentage = DEFAULT_MAX_PERCENTAGE;
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
public boolean supports(Class clazz) { return PriceIncrease.class.equals(clazz);
}
public void validate(Object obj, Errors errors) { PriceIncrease pi = (PriceIncrease) obj;
if (pi == null) { errors.rejectValue("percentage", "error.not-specified", null, "Value required."); }
else { logger.info("Validating with " + pi + ": " + pi.getPercentage()); if (pi.getPercentage() > maxPercentage) { errors.rejectValue("percentage", "error.too-high", new Object[] {new Integer(maxPercentage)}, "Value too high."); }
if (pi.getPercentage() <= minPercentage) { errors.rejectValue("percentage", "error.too-low", new Object[] {new Integer(minPercentage)}, "Value too low."); }
}
}
public void setMinPercentage(int i) { minPercentage = i;
}
public int getMinPercentage() { return minPercentage;
}
public void setMaxPercentage(int i) { maxPercentage = i;
}
public int getMaxPercentage() { return maxPercentage;
}
}
6. form controller의 추가
war/WEB-INF/springapp-servlet.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<!-- the application context definition for the springapp DispatcherServlet -->
<beans>
<bean id="productManager" class="springapp.service.SimpleProductManager">
<property name="products">
<list>
<ref bean="product1"/>
<ref bean="product2"/>
<ref bean="product3"/>
</list>
</property>
</bean>
<bean id="product1" class="springapp.domain.Product">
<property name="description" value="Lamp"/>
<property name="price" value="5.75"/>
</bean>
<bean id="product2" class="springapp.domain.Product">
<property name="description" value="Table"/>
<property name="price" value="75.25"/>
</bean>
<bean id="product3" class="springapp.domain.Product">
<property name="description" value="Chair"/>
<property name="price" value="22.79"/>
</bean>
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="messages"/>
</bean>
<bean name="/hello.htm" class="springapp.web.InventoryController">
<property name="productManager" ref="productManager"/>
</bean>
<bean name="/priceincrease.htm" class="springapp.web.PriceIncreaseFormController">
<property name="sessionForm" value="true"/>
<property name="commandName" value="priceIncrease"/>
<property name="commandClass" value="springapp.service.PriceIncrease"/>
<property name="validator">
<bean class="springapp.service.PriceIncreaseValidator"/>
</property>
<property name="formView" value="priceincrease"/>
<property name="successView" value="hello.htm"/>
<property name="productManager" ref="productManager"/>
</bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
src/web/PriceIncreaseFormController.java
package springapp.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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import springapp.service.ProductManager;
import springapp.service.PriceIncrease;
public class PriceIncreaseFormController extends SimpleFormController {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private ProductManager productManager;
public ModelAndView onSubmit(Object command)
throws ServletException {
int increase = ((PriceIncrease) command).getPercentage();
logger.info("Increasing prices by " + increase + "%.");
productManager.increasePrice(increase);
logger.info("returning from PriceIncreaseForm view to " + getSuccessView());
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 productManager) { this.productManager = productManager;
}
public ProductManager getProductManager() { return productManager;
}
}
war/WEB-INF/classes/messages.properties
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!!!
hello.jsp 의 수정
<%@ 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>
