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发表时间：2008-05-18
第一章
引入myfaces的其中一个t标签： <%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%> <t:dataTable id="data" styleClass="scrollerTable" headerClass="standardTable_Header" footerClass="standardTable_Header" rowClasses="standardTable_Row1,standardTable_Row2" columnClasses="standardTable_Column,standardTable_ColumnCentered,standardTable_Column" var="car" value="#{scrollerList.list}" preserveDataModel="false" rows="10"></t:dataTable> 讲解： t:dataTable标签是用来分页输出List数组 id定义分页表的id， styleClass定义表的样式css类 headerClass定义表头的样式css类 footerClass定义表尾的样式css类 rowClasses定义行的样式css类 columnClasses定义列的样式css类 var定义每一条记录 value指定要分页的数据 rows指定每页显示数据 <t:dataScroller id="scroll_1" for="data" fastStep="10" pageCountVar="pageCount" pageIndexVar="pageIndex" styleClass="scroller" paginator="true" paginatorMaxPages="5" paginatorTableClass="paginator" paginatorActiveColumnStyle="font-weight:bold;" immediate="true" actionListener="#{scrollerList.scrollerAction}"> </t: dataScroller > 讲解： t:dataScroller显示分页信息 id定义分页格式id for指向数据源 fastStep向前向后快进的页数 pageCountVar总页数 pageIndexVar当前页数 styleClass定义分页格式的css类 paginator是否显示页数变化轨迹 paginatorMaxPages指定页数变化轨迹中的数量 第二章 应用Myfaces 进行On-demand loading分页 index.jsp>>> <%@ page session="false" contentType="text/xml;charset=utf-8"%> <% response.sendRedirect("dataScroller.jsf"); %> dataScroller.jsp>>>页面中的图片和css请参见myfaces.apache.org的simple <%@ page session="false" contentType="text/html;charset=utf-8"%> <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%> <%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%> <html> <%@include file="inc/head.inc"%> <body> <f:view> <h:form> <f:loadBundle basename="org.apache.myfaces.examples.resource.example_messages" var="example_messages" /> <h:panelGroup id="body"> <t:dataTable id="data" styleClass="scrollerTable" headerClass="standardTable_Header" footerClass="standardTable_Header" rowClasses="standardTable_Row1,standardTable_Row2" columnClasses="standardTable_Column,standardTable_ColumnCentered,standardTable_Column" var="car" value="#{scrollerList.dataModel}" preserveDataModel="true" rows="10"> <h:column> <f:facet name="header"> </f:facet> <h:outputText value="#{car.id}" /> </h:column> <h:column> <f:facet name="header"> <h:outputText value="#{example_messages['label_cars']}" /> </f:facet> <h:outputText value="#{car.type}" /> </h:column> <h:column> <f:facet name="header"> <h:outputText value="#{example_messages['label_color']}" /> </f:facet> <h:outputText value="#{car.color}" /> </h:column> </t:dataTable> <h:panelGrid columns="1" styleClass="scrollerTable2" columnClasses="standardTable_ColumnCentered"> <t:dataScroller id="scroll_1" for="data" fastStep="10" pageCountVar="pageCount" pageIndexVar="pageIndex" styleClass="scroller" paginator="true" paginatorMaxPages="5" paginatorTableClass="paginator" paginatorActiveColumnStyle="font-weight:bold;" actionListener="#{scrollerList.scrollerAction}"> <f:facet name="first"> <t:graphicImage url="images/arrow-first.gif" border="1" /> </f:facet> <f:facet name="last"> <t:graphicImage url="images/arrow-last.gif" border="1" /> </f:facet> <f:facet name="previous"> <t:graphicImage url="images/arrow-previous.gif" border="1" /> </f:facet> <f:facet name="next"> <t:graphicImage url="images/arrow-next.gif" border="1" /> </f:facet> <f:facet name="fastforward"> <t:graphicImage url="images/arrow-ff.gif" border="1" /> </f:facet> <f:facet name="fastrewind"> <t:graphicImage url="images/arrow-fr.gif" border="1" /> </f:facet> </t:dataScroller> <t:dataScroller id="scroll_2" for="data" rowsCountVar="rowsCount" displayedRowsCountVar="displayedRowsCountVar" firstRowIndexVar="firstRowIndex" lastRowIndexVar="lastRowIndex" pageCountVar="pageCount" pageIndexVar="pageIndex"> <h:outputFormat value="#{example_messages['dataScroller_pages']}" styleClass="standard"> <f:param value="#{rowsCount}" /> <f:param value="#{displayedRowsCountVar}" /> <f:param value="#{firstRowIndex}" /> <f:param value="#{lastRowIndex}" /> <f:param value="#{pageIndex}" /> <f:param value="#{pageCount}" /> </h:outputFormat> </t:dataScroller> </h:panelGrid> </h:panelGroup> <t:commandLink value="test" immediate="true" /> </h:form> </f:view> </body> </html> Car.java>>> package org.apache.myfaces.examples.listexample; import java.io.Serializable; public class Car implements Serializable { /** * serial id for serialisation versioning */ private static final long serialVersionUID = 1L; private String id; private String type; private String color; public Car() { } public Car(String id, String type, String color) { this.id = id; this.type = type; this.color = color; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } } DataPage.java>>> package org.apache.myfaces.examples.listexample; import java.util.List; public class DataPage { /** * 将需要的页的数据封装到一个DataPage中去， 这个类表示了我们需要的一页的数据，<br> * 里面包含有三个元素：datasetSize，startRow，和一个用于表示具体数据的List。<br> * datasetSize表示了这个记录集的总条数，查询数据的时候，使用同样的条件取count即可，<br> * startRow表示该页的起始行在数据库中所有记录集中的位置 */ private int datasetSize; private int startRow; private List data; /** */ /** * Create an object representing a sublist of a dataset. * * @param datasetSize * is the total number of matching rows available. * * @param startRow * is the index within the complete dataset of the first element * in the data list. * * @param data * is a list of consecutive objects from the dataset. */ public DataPage(int datasetSize, int startRow, List data) { this.datasetSize = datasetSize; this.startRow = startRow; this.data = data; } /** */ /** * Return the number of items in the full dataset. */ public int getDatasetSize() { return datasetSize; } /** */ /** * Return the offset within the full dataset of the first element in the * list held by this object. */ public int getStartRow() { return startRow; } /** */ /** * Return the list of objects held by this object, which is a continuous * subset of the full dataset. */ public List getData() { return data; } } DataScrollerList.java>>> package org.apache.myfaces.examples.listexample; import java.util.ArrayList; import java.util.List; import javax.faces.context.FacesContext; import javax.faces.event.ActionEvent; import javax.faces.model.DataModel; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.myfaces.custom.datascroller.ScrollerActionEvent; import org.apache.myfaces.examples.dao.CarDAO; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class DataScrollerList extends BasePagedBackingBean { private final Log log = LogFactory.getLog("DataScrollerList"); private CarDAO carDAO = (CarDAO) getBean("carDAOBean"); public DataScrollerList() { log.info("创建 DataScroller"); } public void scrollerAction(ActionEvent event) { ScrollerActionEvent scrollerEvent = (ScrollerActionEvent) event; FacesContext.getCurrentInstance().getExternalContext().log( "scrollerAction: facet: " + scrollerEvent.getScrollerfacet() + ", pageindex: " + scrollerEvent.getPageIndex()); } public int getTotalCount() { int totalCount = 0; totalCount = carDAO.getTotalCount(); return totalCount; } /** * 在DataScrollerList这个 Backing Bean中加一些东西，<br> * 调用业务逻辑，并将数据交给PagedListDataModel，来帮我们完成最后的分页工作。 */ public DataPage getDataPage(int startRow, int pageSize) { DataPage dataPage = carDAO.getDataPage(startRow, pageSize); return dataPage; } } BasePagedBackingBean.java>>> package org.apache.myfaces.examples.listexample; import javax.faces.model.DataModel; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public abstract class BasePagedBackingBean { private final Log log = LogFactory.getLog("BasePagedBackingBean"); protected abstract DataPage getDataPage(int startRow, int pageSize); public abstract int getTotalCount(); private DataModel dataModel; private int i = 0; // 为什么getDataModel这个方法要调用两次？非常不解啊 public DataModel getDataModel() { i++; log.info("第" + i + "次调用 getDataModel."); if (dataModel == null) { log.info("创建 DataModel"); dataModel = new LocalDataModel(10); } return dataModel; } public Object getBean(String beanName) { ApplicationContext ac = new ClassPathXmlApplicationContext( "spring/applicationContext.xml"); Object ob = (Object) ac.getBean(beanName); return ob; } private class LocalDataModel extends PagedListDataModel { public LocalDataModel(int pageSize) { super(pageSize); } public int fetchRowCount() { return getTotalCount(); } public DataPage fetchPage(int startRow, int pageSize) { // call enclosing managed bean method to fetch the data return getDataPage(startRow, pageSize); } } } PagedListDataModel.java>>> package org.apache.myfaces.examples.listexample; import javax.faces.model.DataModel; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** */ /** * A special type of JSF DataModel to allow a datatable and datascroller to page * through a large set of data without having to hold the entire set of data in * memory at once. * <p> * Any time a managed bean wants to avoid holding an entire dataset, the managed * bean should declare an inner class which extends this class and implements * the fetchData method. This method is called as needed when the table requires * data that isn\'t available in the current data page held by this object. * <p> * This does require the managed bean (and in general the business method that * the managed bean uses) to provide the data wrapped in a DataPage object that * provides info on the full size of the dataset. */ /** * 这个类里面的方法被myfaces<t:dataTable>调用顺序为：<br> * 1.构造函数public PagedListDataModel(int pageSize) <br> * 2.getRowCount()<br> * 3.setRowIndex()<br> * 4.public boolean isRowAvailable()<br> * 5.public Object getRowData() */ public abstract class PagedListDataModel extends DataModel { private final Log log = LogFactory.getLog("PagedListDataModel"); int pageSize; int rowIndex; private int rowCount = -1; DataPage page; /** */ /** * Create a datamodel that pages through the data showing the specified * number of rows on each page. */ public PagedListDataModel(int pageSize) { super(); this.pageSize = pageSize; this.rowIndex = -1; this.page = null; } /** */ /** * Not used in this class; data is fetched via a callback to the fetchData * method rather than by explicitly assigning a list. */ public void setWrappedData(Object o) { if (o instanceof DataPage) { this.page = (DataPage) o; } else { throw new UnsupportedOperationException("setWrappedData"); } } public int getRowIndex() { return rowIndex; } /** */ /** * Specify what the "current row" within the dataset is. Note that the * UIData component will repeatedly call this method followed by getRowData * to obtain the objects to render in the table. */ public void setRowIndex(int index) { rowIndex = index; } /** * Return the total number of rows of data available (not just the number of * rows in the current page!). */ public int getRowCount() { if (rowCount < 0) { log.info("默认rowCount:" + rowCount); rowCount = fetchRowCount(); log.info("初始化rowCount:" + rowCount); } return rowCount; } /** * Return a DataPage object; if one is not currently available then fetch * one. Note that this doesn\'t ensure that the datapage returned includes * the current rowIndex row; see getRowData. */ private DataPage getPage(String name) { if (page != null) { return page; } int rowIndex = getRowIndex(); int startRow = rowIndex; if (rowIndex == -1) { // even when no row is selected, we still need a page // object so that we know the amount of data available. startRow = 0; } // invoke method on enclosing class log.info("getPage：" + name + "创建page"); page = fetchPage(startRow, pageSize); return page; } /** */ /** * Return the object corresponding to the current rowIndex. If the DataPage * object currently cached doesn\'t include that index then fetchPage is * called to retrieve the appropriate page. */ public Object getRowData() { if (rowIndex < 0) { throw new IllegalArgumentException( "Invalid rowIndex for PagedListDataModel; not within page"); } // ensure page exists; if rowIndex is beyond dataset size, then // we should still get back a DataPage object with the dataset size // in it if (page == null) { page = fetchPage(rowIndex, pageSize); rowCount = page.getDatasetSize();// log.info("getRowData：创建page"); } int datasetSize = page.getDatasetSize(); int startRow = page.getStartRow(); int nRows = page.getData().size(); int endRow = startRow + nRows; if (rowIndex >= datasetSize) { throw new IllegalArgumentException("Invalid rowIndex"); } if (rowIndex < startRow) { log.info("fetchPage：向前取数据,getRowData：创建page,rowIndex:" + rowIndex); page = fetchPage(rowIndex, pageSize); log.info("翻页之前rowCount:" + rowCount); rowCount = page.getDatasetSize();// log.info("翻页之后rowCount:" + rowCount); startRow = page.getStartRow(); } else if (rowIndex >= endRow) { log.info("fetchPage：向后取数据,getRowData：创建page,rowIndex:" + rowIndex); page = fetchPage(rowIndex, pageSize); log.info("翻页之前rowCount:" + rowCount); rowCount = page.getDatasetSize();// log.info("翻页之后rowCount:" + rowCount); startRow = page.getStartRow(); } return page.getData().get(rowIndex - startRow); } public Object getWrappedData() { return page.getData(); } /** */ /** * Return true if the rowIndex value is currently set to a value that * matches some element in the dataset. Note that it may match a row that is * not in the currently cached DataPage; if so then when getRowData is * called the required DataPage will be fetched by calling fetchData. */ public boolean isRowAvailable() { DataPage page = getPage("isRowAvailable"); if (page == null) { return false; } int rowIndex = getRowIndex(); if (rowIndex < 0) { return false; } else if (rowIndex >= page.getDatasetSize()) { return false; } else { return true; } } /** */ /** * Method which must be implemented in cooperation with the managed bean * class to fetch data on demand. */ public abstract DataPage fetchPage(int startRow, int pageSize); public abstract int fetchRowCount(); } CarDAO.java>>> package org.apache.myfaces.examples.dao; import org.apache.myfaces.examples.listexample.DataPage; public interface CarDAO { public DataPage getDataPage(int startRow, int pageSize); public int getTotalCount(); } CarDAOImpl.java>>> package org.apache.myfaces.examples.dao.impl; import java.util.List; import org.apache.myfaces.examples.dao.CarDAO; import org.apache.myfaces.examples.listexample.DataPage; import org.hibernate.Query; import org.hibernate.Session; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; public class CarDAOImpl extends HibernateDaoSupport implements CarDAO { public DataPage getDataPage(int startRow, int pageSize) { DataPage page = new DataPage(getCountCars(), startRow, getCars( startRow, pageSize)); return page; } public int getTotalCount() { return getCountCars(); } public List getCars(int startRow, int pageSize) { Session session = this.getSession(); String sql = "from Car"; Query query = session.createQuery(sql); query.setFirstResult(startRow); query.setMaxResults(pageSize); List list = query.list(); return list; } public int getCountCars() { String sql = "select count(*) from Car"; List list = getHibernateTemplate().find(sql); int count = 0; if (list.size() > 0) { count = ((Long) list.get(0)).intValue(); } return count; } } 配置文件： web.xml>>> <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <listener> <listener-class> org.apache.myfaces.webapp.StartupServletContextListener </listener-class> </listener> <listener> <listener-class> org.springframework.web.util.Log4jConfigListener </listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/classes/spring/applicationContext.xml </param-value> </context-param> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j.properties</param-value> </context-param> <context-param> <param-name>log4jRefreshInterval</param-name> <param-value>60000</param-value> </context-param> <servlet> <servlet-name>context</servlet-name> <servlet-class> org.springframework.web.context.ContextLoaderServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>0</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.jsf</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <error-page> <error-code>500</error-code> <location>/error.jsp</location> </error-page> </web-app> Car.hbm.xml>>> <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <!-- Mapping file autogenerated by MyEclipse - Hibernate Tools --> <hibernate-mapping> <class name="org.apache.myfaces.examples.listexample.Car" table="CAR"> <id name="id" type="java.lang.String"> <column name="ID" precision="22" scale="0" /> <generator class="assigned" /> </id> <property name="type" type="java.lang.String"> <column name="TYPE" length="20" /> </property> <property name="color" type="java.lang.String"> <column name="COLOR" length="20" /> </property> </class> </hibernate-mapping> faces-config.xml>>> <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN" "http://java.sun.com/dtd/web-facesconfig_1_1.dtd"> <faces-config> <!-- Managed Beans for dataScroller.jsp --> <managed-bean> <managed-bean-name>scrollerList</managed-bean-name> <managed-bean-class> org.apache.myfaces.examples.listexample.DataScrollerList </managed-bean-class> <managed-bean-scope>session</managed-bean-scope> </managed-bean> <navigation-rule> <navigation-case> <from-outcome>go_datascroller</from-outcome> <to-view-id>/dataScroller.jsp</to-view-id> </navigation-case> </navigation-rule> </faces-config> applicationConfig.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="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName"> <value>java:comp/env/VSPN18DATASOURCE</value> </property> </bean> --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@localhost:1521:oracle" /> <property name="username" value="vst" /> <property name="password" value="vst" /> <property name="maxActive" value="100" /> <property name="maxIdle" value="30" /> <property name="maxWait" value="1000" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource"> <ref bean="dataSource" /> </property> <property name="mappingResources"> <list> <value>org\apache\myfaces\examples\listexample\Car.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.OracleDialect </prop> <prop key="hibernate.show_sql">true</prop> </props> </property> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory"> <ref local="sessionFactory" /> </property> </bean> <bean id="carDAO" class="org.apache.myfaces.examples.dao.impl.CarDAOImpl"> <property name="sessionFactory"> <ref local="sessionFactory" /> </property> </bean> <bean id="carDAOBean" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager"> <ref bean="transactionManager" /> </property> <property name="target"> <ref local="carDAO" /> </property> <property name="transactionAttributes"> <props> <prop key="insert*">PROPAGATION_REQUIRED</prop> <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop> </props> </property> </bean> </beans> log4j.properties>>> log4j.rootLogger=INFO, stdout 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.logger.uk.ltd.getahead.dwr = ERROR log4j.logger.org.hibernate = ERROR log4j.logger.org.springframework= ERROR log4j.logger.org.apache.myfaces= ERROR 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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