JBuilder開(kāi)發(fā)Spring實(shí)例

2019-11-17 05:56:06

字體：大中小

供稿：網(wǎng)友

1. 下載sPRing包，網(wǎng)址如下

http://www.springframework.org/download.Html

解壓后的目錄中包含了dist、lib等子目錄

2. 在JBuilder2005中增加spring庫(kù)，選擇菜單Tools-Configure-Libraries，在彈出的對(duì)話框中點(diǎn)擊New按鈕，輸入spring庫(kù)的名稱(chēng)：spring，點(diǎn)擊Add按鈕，將dist目錄中的所有jar文件增加到spring庫(kù)中

3. 新建工程文件，選菜單File-New Project，給工程文件取名為myProject

設(shè)置工程文件的屬性，選菜單Project-Project Properties，選擇Tomcat作為服務(wù)器，將spring庫(kù)加入Path/Required Libraries。因?yàn)槔又杏玫搅薼og4j，將包含了log4j的庫(kù)加入Path/Required Libraries，注重到lib目錄下有兩個(gè)子目錄log4j和jakarta-commons，它們的用法是不同的,如下面的代碼片斷所示：

log4j

import org.apache.log4j.Level;

import org.apache.log4j.Logger;

public class SpringappController implements Controller {

/** Logger for this class and subclasses */

static Logger logger = Logger.getLogger(SpringappController.class);

jakarta-commons

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

public class SpringappController implements Controller {

/** Logger for this class and subclasses */

protected final Log logger = LogFactory.getLog(getClass());

4. 新建Web模塊，選菜單File-New，給Web模塊取名為springapp

5. 新建hello.jsp文件如下：

<%@ page contentType="text/html; charset=Big5" %>

<html>

<head><title>Example :: Spring application</title></head>

<body>

<h1>Hello - Spring Application</h1>

<p>Greetings.</p>

</body>

</html>

6. 新建類(lèi)文件SpringappController.java如下：

package spring;

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 org.apache.commons.logging.Log;

//import org.apache.commons.logging.LogFactory;

import org.apache.log4j.Level;

import org.apache.log4j.Logger;

public class SpringappController implements Controller {

/** Logger for this class and subclasses */

// protected final Log logger = LogFactory.getLog(getClass());

static Logger logger = Logger.getLogger(SpringappController.class);

public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

logger.info("SpringappController - returning hello view");

return new ModelAndView("hello.jsp");

}

7. 修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>

<web-app>

<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>

</web-app>

8. 在web-inf目錄中新建springapp-servlet.xml文件如下

<?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>

<props>

<prop key="/hello.htm">springappController</prop>

</props>

</property>

</bean>

</beans>

9. 在web-inf目錄中新建log4j.properties文件如下：

log4j.rootCategory=INFO, stdout, logfile

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - <%m>%n

log4j.appender.logfile=org.apache.log4j.RollingFileAppender

log4j.appender.logfile.File=springapp.log

log4j.appender.logfile.MaxFileSize=512KB

# Keep three backup files

log4j.appender.logfile.MaxBackupIndex=3

log4j.appender.logfile.layout=org.apache.log4j.PatternLayout

#Pattern to output : date priority [category] - <message>line_separator

log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - <%m>%n

10. 設(shè)置web模塊springapp的屬性Content，加入文件log4j.properties，因?yàn)閏lasses目錄是自動(dòng)產(chǎn)生的，這一步是為了把文件log4j.properties加到classes目錄。

11. 設(shè)置Run Configuration，選菜單Run-Configurations，新建一個(gè)Run Configuration，Type選Server，Launch URI設(shè)置為：/springapp/hello.htm，給它取名為hello

12. 運(yùn)行，你會(huì)在messages窗口中看到如下信息：

資訊: Server startup in 9253 ms

2004-11-05 15:05:00,585 INFO [spring.SpringappController] - <SpringappController - returning hello view>

2004/11/5 下午 03:05:00 org.springframework.web.servlet.view.AbstractCachingViewResolver resolveViewName

資訊: Cached view 'hello.jsp'

在myProject/Tomcat/springapp.log文件中增加了一行如下所示：

2004-11-05 15:11:32,348 INFO [spring.SpringappController] - <SpringappController - returning hello view>

這說(shuō)明你已成功建立了基本的spring應(yīng)用。

13. 增加對(duì)jstl的支持，設(shè)置工程文件的屬性，選菜單Project-Project Properties，將jstl庫(kù)加入Path/Required Libraries。

14. 改進(jìn)前面的例子，改進(jìn)的文件如下：

增加“header”文件include.jsp，這是一些jsp文件的公用部分，這樣可以使得開(kāi)發(fā)和維護(hù)更輕易。所有jsp文件放在web-inf/jsp目錄下，為的是只有Controller可以訪問(wèn)View。

springapp/war/WEB-INF/jsp/include.jsp

<%@ page session="false"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>

利用JSTL，<c:redirect>將頁(yè)面重定向到Controller，這樣就建立了index.jsp和應(yīng)用架構(gòu)的聯(lián)系。

springapp/war/index.jsp

<%@ include file="/WEB-INF/jsp/include.jsp" %>

<%-- Redirected because we can't set the welcome page to a virtual URL. --%>
<c:redirect url="/hello.htm"/>

利用JSTL的<c:out>標(biāo)記，把從Model提取的，傳遞給View的當(dāng)前日期和時(shí)間作為輸出。

springapp/war/WEB-INF/jsp/hello.jsp

<%@ include file="/WEB-INF/jsp/include.jsp" %>

<html>
<head><title>Hello :: Spring Application</title></head>
<body>
<h1>Hello - Spring Application</h1>
<p>Greetings, it is now <c:out value="${now}"/>
</p>
</body>
</html>

在SpringappController.java中增加包含了當(dāng)前日期和時(shí)間的string作為Model

springapp/src/SpringappController.java

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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SpringappController implements Controller {

    /** Logger for this class and subclasses */
    protected final Log logger = LogFactory.getLog(getClass());

    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String now = (new java.util.Date()).toString();
        logger.info("returning hello view with " + now);

        return new ModelAndView("WEB-INF/jsp/hello.jsp", "now", now);
    }
}

15. 瀏覽改進(jìn)后的結(jié)果http://localhost:8080/springapp，首先訪問(wèn)index.jsp，然后重定向到hello.htm，接著把控制交給Controller，Controller把日期和時(shí)間傳送給View。

只能在瀏覽器這樣測(cè)試。在JBuilder2005中設(shè)置Run Configuration不能訪問(wèn)http://localhost:8080/springapp，但可以訪問(wèn)http://localhost:8080/springapp/index.jsp

在上面的例子中，Controller指定了View的完全路徑，使得Controller和View之間存在不必要的依靠。為了移出這種依靠，我們可以用類(lèi)ResourceBundleViewResolver 和 a SimpleUrlHandlerMapping在屬性文件中定義這種依靠，對(duì)于簡(jiǎn)單的情形，我們也可以利用InternalResourceViewResolver設(shè)置前綴和后綴，下面就用第二種方法。修改文件springapp-servlet.xml包含ViewResolver設(shè)置，我們還選擇使用JstlView，這使得我們可以結(jié)合使用JSTL和message resource bundles，因此可以支持國(guó)際化。

現(xiàn)在，我們就可以移出Controller中View名稱(chēng)的前綴和后綴了。

這樣修改后的例子應(yīng)該仍能運(yùn)行。

16. 增加商業(yè)邏輯類(lèi)

為了分開(kāi)Web邏輯和商業(yè)邏輯，我們建立兩個(gè)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以便顯示商業(yè)數(shù)據(jù)，增加對(duì)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. 增加一些測(cè)試數(shù)據(jù)

我們現(xiàn)在還不打算增加代碼，從數(shù)據(jù)庫(kù)裝載商業(yè)對(duì)象。我們只springapp-servlet.xml中增加bean和messageSource設(shè)置，提供一些測(cè)試數(shù)據(jù)和對(duì)messages resource bundle的支持。

19. 增加message bundle

springapp/war/WEB-INF/classes/messages.properties

title=SpringApp
heading=Hello :: SpringApp
greeting=Greetings, it is now

20. 瀏覽改進(jìn)后的結(jié)果http://localhost:8080/springapp

實(shí)現(xiàn)數(shù)據(jù)庫(kù)持久層

21. 設(shè)置HSQL數(shù)據(jù)庫(kù)，在JBuilder2005中增加HSQL庫(kù)，選擇菜單Tools-Configure-Libraries，在彈出的對(duì)話框中點(diǎn)擊New按鈕，輸入HSQL庫(kù)的名稱(chēng)：HSQL，點(diǎn)擊Add按鈕，將lib/hsqldb目錄下的文件hsqldb.jar增加到HSQL庫(kù)中。

選擇菜單Enterprise-Enterprise Setup，在彈出的對(duì)話框中選擇Database Drivers，按Add按鈕增加HSQL庫(kù)。

選擇菜單Tools-Database Pilot，然后選擇菜單Files-New輸入Driver：org.hsqldb.jdbcDriver，URL：jdbc:hsqldb:db/test，雙擊hsqldb:db/test，輸入U(xiǎn)serName：sa，不必輸入PasssWord。輸入如下的SQL語(yǔ)句并執(zhí)行

CREATE TABLE products (

id INTEGER NOT NULL PRIMARY KEY,

description varchar(255),

price decimal(15,2)

);

CREATE INDEX products_description ON products(description);

INSERT INTO products (id, description, price) values(1, 'Lamp', 5.78);

INSERT INTO products (id, description, price) values(2, 'Table', 75.29);

INSERT INTO products (id, description, price) values(3, 'Chair', 22.81);

這樣就會(huì)在JBuilder_Home/bin目錄下創(chuàng)建一個(gè)目錄db，存放了數(shù)據(jù)庫(kù)test的數(shù)據(jù)

22. 創(chuàng)建JDBC DAO (Data access Object)實(shí)現(xiàn)

springapp/src/db/ProductManagerDao.java

package db;

import bus.Product;
import java.util.List;

public interface ProductManagerDao {

public List getProductList();

public void increasePrice(Product prod, int pct);

}

springapp/src/db/ProductManagerDaoJdbc.java

package db;

import bus.Product;
import java.util.List;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.jdbc.object.MappingSqlQuery;
import org.springframework.jdbc.object.SqlUpdate;
import org.springframework.jdbc.core.SqlParameter;

public class ProductManagerDaoJdbc implements ProductManagerDao {

    /** Logger for this class and subclasses */
    protected final Log logger = LogFactory.getLog(getClass());

    private DataSource ds;

    public List getProductList() {
        logger.info("Getting products!");
        ProductQuery pq = new ProductQuery(ds);
        return pq.execute();
    }

    public void increasePrice(Product prod, int pct) {
        logger.info("Increasing price by " + pct + "%");
        SqlUpdate su =
            new SqlUpdate(ds, "update products set price = price * (100 + ?) / 100 where id = ?");
        su.declareParameter(new SqlParameter("increase", Types.INTEGER));
        su.declareParameter(new SqlParameter("ID", Types.INTEGER));
        su.compile();
        Object[] oa = new Object[2];
        oa[0] = new Integer(pct);
        oa[1] = new Integer(prod.getId());
        int count = su.update(oa);
        logger.info("Rows affected: " + count);
    }

    public void setDataSource(DataSource ds) {
        this.ds = ds;
    }

    class ProductQuery extends MappingSqlQuery {

        ProductQuery(DataSource ds) {
            super(ds, "SELECT id, description, price from products");
            compile();
        }

        protected Object mapRow(ResultSet rs, int rowNum) throws SQLException {
            Product prod = new Product();
            prod.setId(rs.getInt("id"));
            prod.setDescription(rs.getString("description"));
            prod.setPrice(new Double(rs.getDouble("price")));
            return prod;
        }

    }

}

springapp/src/bus/Product.java

package bus;

import java.io.Serializable;

public class Product implements Serializable {

    private int id;
    private String description;
    private Double price;

    public void setId(int i) {
        id = i;
    }

    public int getId() {
        return id;
    }

    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/test/TestProductManagerDaoJdbc.java

package tests;

import java.util.List;
import java.util.ArrayList;
import junit.framework.TestCase;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import db.ProductManagerDaoJdbc;
import bus.Product;

public class TestProductManagerDaoJdbc extends TestCase {

    private ProductManagerDaoJdbc pmdao;

    public void setUp() {
        pmdao = new ProductManagerDaoJdbc();

        DriverManagerDataSource ds = new DriverManagerDataSource();
        ds.setDriverClassName("org.hsqldb.jdbcDriver");
        ds.setUrl("jdbc:hsqldb:db/test");
        ds.setUsername("sa");
        ds.setPassword("");
        pmdao.setDataSource(ds);
    }

    public void testGetProductList() {
        List l = pmdao.getProductList();
        Product p1 = (Product) l.get(0);
        assertEquals("Lamp", p1.getDescription());
        Product p2 = (Product) l.get(1);
        assertEquals("Table", p2.getDescription());
    }

    public void testIncreasePrice() {
        List l1 = pmdao.getProductList();
        Product p1 = (Product) l1.get(0);
        assertEquals(new Double("5.78"), p1.getPrice());
        pmdao.increasePrice(p1, 10);
        List l2 = pmdao.getProductList();
        Product p2 = (Product) l2.get(0);
        assertEquals(new Double("6.36"), p2.getPrice());
    }

}

23. 修改Web應(yīng)用使其使用數(shù)據(jù)庫(kù)持久層

springapp/src/bus/ProductManager.java

package bus;

import java.io.Serializable;
import java.util.ListIterator;
import java.util.List;
import db.ProductManagerDao;

public class ProductManager implements Serializable {

    private ProductManagerDao pmd;
    private List products;

    public void setProductManagerDao(ProductManagerDao pmd) {
        this.pmd = pmd;
    }

/*
    public void setProducts(List p) {
        products = p;
    }
*/

    public List getProducts() {
        products = pmd.getProductList();
        return products;
    }

    public void increasePrice(int pct) {
        ListIterator li = products.listIterator();
        while (li.hasNext()) {
            Product p = (Product) li.next();

/*
            double newPrice = p.getPrice().doubleValue() * (100 + pct)/100;
            p.setPrice(new Double(newPrice));
*/
            pmd.increasePrice(p, pct);
        }

    }

}

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">



<beans>

    
    <bean id="springappController" class="web.SpringappController">
        <property name="productManager">
            <ref bean="prodMan"/>
        </property>
    </bean>

    
    <bean id="priceIncreaseValidator" class="bus.PriceIncreaseValidator"/>
    <bean id="priceIncreaseForm" class="web.PriceIncreaseFormController">
        <property name="sessionForm"><value>true</value></property>
        <property name="commandName"><value>priceIncrease</value></property>
        <property name="commandClass"><value>bus.PriceIncrease</value></property>
        <property name="validator"><ref bean="priceIncreaseValidator"/></property>
        <property name="formView"><value>priceincrease</value></property>
        <property name="successView"><value>hello.htm</value></property>
        <property name="productManager">
            <ref bean="prodMan"/>
        </property>
    </bean>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name="driverClassName"><value>org.hsqldb.jdbcDriver</value></property>

      <property name="url">
        <value>jdbc:hsqldb:/home/trisberg/workspace/springapp/db/test</value>
      </property>
      <property name="username"><value>sa</value></property>
      <property name="password"><value></value></property>
    </bean>

    <bean id="prodManDao" class="db.ProductManagerDaoJdbc">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
    </bean>

    <bean id="prodMan" class="bus.ProductManager">
        <property name="productManagerDao">
            <ref bean="prodManDao"/>
        </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>
                <prop key="/priceincrease.htm">priceIncreaseForm</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>

springapp/src/tests/MockProductManagerDaoImpl.java

package tests;

import bus.Product;
import java.util.List;
import db.ProductManagerDao;
import bus.Product;

public class MockProductManagerDaoImpl implements ProductManagerDao {

    private List products;

    public void setProducts(List p) {
        products = p;
    }

    public List getProductList() {
        return products;
    }

    public void increasePrice(Product prod, int pct) {
        double newPrice = prod.getPrice().doubleValue() * (100 + pct)/100;
        prod.setPrice(new Double(newPrice));
    }

}

springapp/src/tests/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">



<beans>
    <bean id="springappController" class="web.SpringappController">
        <property name="productManager">
            <ref bean="prodMan"/>
        </property>
    </bean>

    <bean id="prodManDao" class="tests.MockProductManagerDaoImpl">
        <property name="products">
            <list>
                <ref bean="product1"/>
                <ref bean="product2"/>
                <ref bean="product3"/>
            </list>
        </property>
    </bean>

    <bean id="prodMan" class="bus.ProductManager">
        <property name="productManagerDao">
            <ref bean="prodManDao"/>
        </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>

</beans>

springapp/src/tests/TestProductManager .java

package tests;

import java.util.List;
import java.util.ArrayList;
import junit.framework.TestCase;
import db.ProductManagerDao;
import bus.ProductManager;
import bus.Product;

public class TestProductManager extends TestCase {

    private ProductManager pm;

    public void setUp() {
        pm = new ProductManager();
        Product p = new Product();
        p.setDescription("Chair");
        p.setPrice(new Double("20.50"));
        ArrayList al = new ArrayList();
        al.add(p);
        p = new Product();
        p.setDescription("Table");
        p.setPrice(new Double("150.10"));
        al.add(p);
/*
        pm.setProducts(al);
*/
        MockProductManagerDaoImpl pmdao = new MockProductManagerDaoImpl();
        pmdao.setProducts(al);
        pm.setProductManagerDao(pmdao);
        pm.getProducts();
    }

    public void testGetProducs() {
        List l = pm.getProducts();
        Product p1 = (Product) l.get(0);
        assertEquals("Chair", p1.getDescription());
        Product p2 = (Product) l.get(1);
        assertEquals("Table", p2.getDescription());
    }

    public void testIncreasePrice() {
        pm.increasePrice(10);

        List l = pm.getProducts();
        Product p = (Product) l.get(0);
        assertEquals(new Double("22.55"), p.getPrice());
        p = (Product) l.get(1);
        assertEquals(new Double("165.11"), p.getPrice());
    }

}