스프링 tutorial (6)

개발/스프링 2008. 7. 26. 16:55

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>
 

 

 

 

 

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