MyFaces Oracle大数据表分页封装

MyFaces Oracle大数据表分页封装

这里将整个DataTable和DataScroller，dataModel等全部封装，使用时只需要继承基类BasePageBean和页面使用binding PanelGird即可。<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

其中DataPage和PagedListDataModel类来自于网络，目前仍然存在重复查询的问题。

package commons.jsf; import java.util.List; /** * A simple class that represents a "page" of data out of a longer set, ie a list of objects together with info to indicate the starting row and the full size of the dataset. EJBs * can return instances of this type when returning subsets of available data. */ public class DataPage<T> { private int datasetSize; private int startRow; private List<T> 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<T> 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<T> getData() { return data; } public void setStartRow(int startRow) { this.startRow = startRow; } }

package commons.jsf; import java.util.ArrayList; import java.util.List; import javax.faces.model.DataModel; /** * 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&apos;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. */ public abstract class PagedListDataModel<T> extends DataModel { int pageSize; int rowIndex; DataPage<T> 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; // if (page != null ) // { // page.setStartRow(rowIndex); // } } /** */ /** * Return the total number of rows of data available (not just the number of rows in the current page!). */ public int getRowCount() { return getPage().getDatasetSize(); } /** */ /** * Return a DataPage object; if one is not currently available then fetch one. Note that this doesn&apos;t ensure that the datapage returned includes the current rowIndex row; see * getRowData. */ public DataPage<T> getPage() { 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 page = fetchPage(startRow, pageSize); return page; } /** */ /** * Return the object corresponding to the current rowIndex. If the DataPage object currently cached doesn&apos;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); } // Check if rowIndex is equal to startRow, // useful for dynamic sorting on pages /* * if (rowIndex == page.getStartRow()){ page = fetchPage(rowIndex, pageSize); } */ 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) { page = fetchPage(rowIndex, pageSize); startRow = page.getStartRow(); } else if (rowIndex >= endRow) { page = fetchPage(rowIndex, pageSize); startRow = page.getStartRow(); } // System.out.println("rowIndex:" + rowIndex + ",pageSize:" + pageSize + ",startRow:" + startRow + ",endRow:" + endRow); try { List list = page.getData(); if (list != null && list.size() > 0) { if (rowIndex >= startRow) { return page.getData().get(rowIndex - startRow); } else { return new ArrayList(0); } } else { return new ArrayList(0); } } catch (Exception e) { //添加catch屏蔽连续点击的索引溢出异常 return new ArrayList(0); } } 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<T> page = getPage(); 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<T> fetchPage(int startRow, int pageSize); }

package commons.jsf; import javax.faces.application.Application; import javax.faces.component.UIColumn; import org.apache.myfaces.custom.crosstable.UIColumns; public interface CellCallBack { UIColumn doCell(int index, Application app, String rowVar); }

package commons.jsf; import java.util.Iterator; import java.util.List; import javax.faces.application.Application; import javax.faces.component.UIColumn; import javax.faces.component.UIComponent; import javax.faces.component.UIParameter; import javax.faces.component.html.HtmlDataTable; import javax.faces.component.html.HtmlOutputFormat; import javax.faces.component.html.HtmlOutputLink; import javax.faces.context.FacesContext; import javax.faces.el.ValueBinding; import org.apache.myfaces.component.html.ext.HtmlOutputText; import org.apache.myfaces.component.html.ext.HtmlPanelGrid; import org.apache.myfaces.component.html.ext.HtmlPanelGroup; import org.apache.myfaces.custom.datascroller.HtmlDataScroller; import commons.FacesUtils; public class DataGird { private HtmlPanelGrid dynamicGrid; private HtmlDataTable dataTable; private HtmlDataScroller ds1; private HtmlDataScroller ds2; /** * 创建翻页 * * @return */ private HtmlDataScroller newDataScroller1(String dataId, int step, int maxPage) { // 数据滚动 ds1 = new HtmlDataScroller(); ds1.setFor(dataId); ds1.setFastStep(step); ds1.setPageCountVar("pageCount"); ds1.setPageIndexVar("pageIndex"); ds1.setRowsCountVar("rowsCount"); ds1.setDisplayedRowsCountVar("displayedRowsCountVar"); ds1.setFirstRowIndexVar("firstRowIndexVar"); ds1.setLastRowIndexVar("lastRowIndexVar"); if (maxPage > 0) { ds1.setPaginator(true); ds1.setPaginatorMaxPages(maxPage); } else { ds1.setPaginator(false); } // ds1.setPaginatorActiveColumnStyle("font-weight:bold;"); ds1.setPaginatorTableClass("paginator"); ds1.setStyleClass("scroller"); ds1.setRendered(true); final HtmlOutputText output1 = new HtmlOutputText(); output1.setValue("首页"); final HtmlOutputText output2 = new HtmlOutputText(); output2.setValue("末页"); final HtmlOutputText output3 = new HtmlOutputText(); output3.setValue("上一页"); final HtmlOutputText output4 = new HtmlOutputText(); output4.setValue("下一页"); ds1.setFirst(output1); ds1.setLast(output2); ds1.setPrevious(output3); ds1.setNext(output4); if (step > 0) { final HtmlOutputText output5 = new HtmlOutputText(); output5.setValue("后" + step + "页"); final HtmlOutputText output6 = new HtmlOutputText(); output6.setValue("前" + step + "页"); ds1.setFastForward(output5); ds1.setFastRewind(output6); } // // // Application app = FacesContext.getCurrentInstance().getApplication(); // final HtmlOutputFormat format = new HtmlOutputFormat(); // format.setValue("总记录数{0},第{1}/共{2}页"); // final UIParameter p1 = new UIParameter(); // final UIParameter p2 = new UIParameter(); // final UIParameter p3 = new UIParameter(); // p1.setValueBinding("value", app.createValueBinding("#{rowsCount}")); // p2.setValueBinding("value", app.createValueBinding("#{pageIndex}")); // p3.setValueBinding("value", app.createValueBinding("#{pageCount}")); // format.getChildren().add(p1); // format.getChildren().add(p2); // format.getChildren().add(p3); // ds1.getChildren().add(format); return ds1; } /** * 创建数据输出 * * @return */ private HtmlDataScroller newDataScroller2(String dataId, int step, int maxPage) { Application app = FacesContext.getCurrentInstance().getApplication(); // 数据滚动 ds1 = new HtmlDataScroller(); ds1.setFor(dataId); ds1.setFastStep(step); ds1.setPageCountVar("pageCount"); ds1.setPageIndexVar("pageIndex"); ds1.setRowsCountVar("rowsCount"); ds1.setDisplayedRowsCountVar("displayedRowsCountVar"); ds1.setFirstRowIndexVar("firstRowIndexVar"); ds1.setLastRowIndexVar("lastRowIndexVar"); ds1.setPaginator(false); // ds1.setPaginatorActiveColumnStyle("font-weight:bold;"); ds1.setPaginatorTableClass("paginator"); ds1.setStyleClass("scroller"); final HtmlOutputFormat format = new HtmlOutputFormat(); format.setValue("总记录数{0},第{1}/共{2}页"); final UIParameter p1 = new UIParameter(); final UIParameter p2 = new UIParameter(); final UIParameter p3 = new UIParameter(); p1.setValueBinding("value", app.createValueBinding("#{rowsCount}")); p2.setValueBinding("value", app.createValueBinding("#{pageIndex}")); p3.setValueBinding("value", app.createValueBinding("#{pageCount}")); format.getChildren().add(p1); format.getChildren().add(p2); format.getChildren().add(p3); ds1.getChildren().add(format); ds1.setRendered(true); return ds1; } /** * 新建一个数据表格 * * @return */ private void createDataTable(DataGirdBean girdBean, CellCallBack call) { Application app = FacesContext.getCurrentInstance().getApplication(); final UIComponent c = FacesUtils.findComponentInRoot(girdBean.getGirdId()); if (c == null) { dynamicGrid = (HtmlPanelGrid) app.createComponent(HtmlPanelGrid.COMPONENT_TYPE); dynamicGrid.setId(girdBean.getGirdId()); } else { dynamicGrid = (HtmlPanelGrid) c; } dynamicGrid.getChildren().clear(); // clear old stuff dynamicGrid.setWidth(girdBean.getGirdWidth()); dataTable = new HtmlDataTable(); dataTable.setId(girdBean.getDataTableId()); dataTable.setRendered(true); dataTable.setWidth(girdBean.getDataTableWidth()); // final List list = dataTable.getChildren(); // list.clear(); // Setup data bindings dataTable.setVar("list"); dataTable.setValueBinding("value", (ValueBinding) app.createValueBinding(girdBean.getDataTableValueBinding())); dataTable.setBorder(0); dataTable.setCellpadding(girdBean.getDataTableCellpadding()); dataTable.setCellspacing(girdBean.getDataTableCellspacing()); dataTable.setStyleClass(girdBean.getDataTableStyleClass()); dataTable.setRows(girdBean.getDataTableRows()); String[] header = girdBean.getDataTableHeader(); for (int i = 0; i < header.length; i++) { UIColumn column = new UIColumn(); HtmlOutputText output = new HtmlOutputText(); output.setValueBinding("value", app.createValueBinding("#{list[" + i + "]}")); column.getChildren().add(output); if (call != null) { column = call.doCell(i,app, "list"); } final HtmlOutputText headerComponent = new HtmlOutputText(); headerComponent.setValue(header[i]); column.setHeader(headerComponent); dataTable.getChildren().add(column); } HtmlPanelGroup pg = new HtmlPanelGroup(); pg.getChildren().add(this.newDataScroller1(girdBean.getDataTableId(), girdBean.getDsStep(), girdBean.getDsMaxPage())); pg.getChildren().add(this.newDataScroller2(girdBean.getDataTableId(), girdBean.getDsStep(), girdBean.getDsMaxPage())); dynamicGrid.getChildren().add(dataTable); dynamicGrid.getChildren().add(pg); } public HtmlPanelGrid createDataPanel(DataGirdBean girdBean, CellCallBack call) { this.createDataTable(girdBean, call); return dynamicGrid; } public HtmlPanelGrid createDataPanel(DataGirdBean girdBean) { this.createDataTable(girdBean, null); return dynamicGrid; } }

package commons.jsf; public class DataGirdBean { private String girdId = "dynamicGrid"; private String girdWidth = "100%"; private String dataTableStyleClass; private String dataTableId = "dynamicTable"; private String dataTableValueBinding; private String dataTableCellpadding = "0"; private String dataTableCellspacing = "0"; private String dataTableWidth = "100%"; private int dataTableRows = 13; private String[] dataTableHeader; private int dsStep = 10; private int dsMaxPage = 10; public String getDataTableCellpadding() { return dataTableCellpadding; } public void setDataTableCellpadding(String dataTableCellpadding) { this.dataTableCellpadding = dataTableCellpadding; } public String getDataTableCellspacing() { return dataTableCellspacing; } public void setDataTableCellspacing(String dataTableCellspacing) { this.dataTableCellspacing = dataTableCellspacing; } public String[] getDataTableHeader() { return dataTableHeader; } public void setDataTableHeader(String[] dataTableHeader) { this.dataTableHeader = dataTableHeader; } public String getDataTableId() { return dataTableId; } public void setDataTableId(String dataTableId) { this.dataTableId = dataTableId; } public int getDataTableRows() { return dataTableRows; } public void setDataTableRows(int dataTableRows) { this.dataTableRows = dataTableRows; } public String getDataTableStyleClass() { return dataTableStyleClass; } public void setDataTableStyleClass(String dataTableStyleClass) { this.dataTableStyleClass = dataTableStyleClass; } public String getDataTableValueBinding() { return dataTableValueBinding; } public void setDataTableValueBinding(String dataTableValueBinding) { this.dataTableValueBinding = dataTableValueBinding; } public String getGirdId() { return girdId; } public void setGirdId(String girdId) { this.girdId = girdId; } public String getGirdWidth() { return girdWidth; } public void setGirdWidth(String girdWidth) { this.girdWidth = girdWidth; } public String getDataTableWidth() { return dataTableWidth; } public void setDataTableWidth(String dataTableWidth) { this.dataTableWidth = dataTableWidth; } public int getDsMaxPage() { return dsMaxPage; } public void setDsMaxPage(int dsMaxPage) { this.dsMaxPage = dsMaxPage; } public int getDsStep() { return dsStep; } public void setDsStep(int dsStep) { this.dsStep = dsStep; } }

package commons.jsf; import java.util.List; import javax.faces.model.DataModel; import org.apache.myfaces.component.html.ext.HtmlPanelGrid; public abstract class BasePageBean { protected DataModel dataModel; protected HtmlPanelGrid dynamicGrid; protected String[] header; public static final int PAGESIZE = 15; public DataModel getDataModel() { if (dataModel == null) { dataModel = new LocalDataModel(PAGESIZE); dataModel.setWrappedData(getDataPage(0, PAGESIZE)); } return dataModel; } private class LocalDataModel extends PagedListDataModel { public LocalDataModel(int pageSize) { super(pageSize); } public DataPage fetchPage(int startRow, int pageSize) { System.out.println(startRow + "====" + pageSize); return getDataPage(startRow, pageSize); } } protected abstract DataPage getDataPage(int startRow, int pageSize); public abstract void createDataTable(); // { // List<Object[]> list = null;// ReadCount1Service.getInstance().count(this.condition, , startRow, pageSize); // int dataSetSize = 0;// ReadCount1Service.getInstance().countCt(); // // System.out.println("-------" + this.dataList.size() + "--" + dataSetSize); // return new DataPage(dataSetSize, startRow, list); // } public void setDataModel(DataModel dataModel) { this.dataModel = dataModel; } public HtmlPanelGrid getDynamicGrid() { createDataTable(); return dynamicGrid; } public void setDynamicGrid(HtmlPanelGrid dynamicGrid) { this.dynamicGrid = dynamicGrid; } public String[] getHeader() { return header; } public void setHeader(String[] header) { this.header = header; } }

package commons; import javax.faces.FactoryFinder; import javax.faces.application.Application; import javax.faces.application.ApplicationFactory; import javax.faces.application.FacesMessage; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; import javax.faces.context.ExternalContext; import javax.faces.el.ValueBinding; import javax.faces.webapp.UIComponentTag; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.util.Iterator; import java.util.Locale; import java.util.MissingResourceException; import java.util.ResourceBundle; /** * Util class for JSF. * * @author Sergey Aleksandrov */ public class FacesUtils { private static final Log log = LogFactory.getLog(FacesUtils.class); private static final String DEFAULT_BUNDLE = "javax.faces.Messages"; /** * Get servlet context. * * @return the servlet context */ public static ServletContext getServletContext() { return getServletContext(FacesContext.getCurrentInstance()); } /** * Get servlet context. * * @param facesContext * FacesContext * @return the servlet context */ public static ServletContext getServletContext(FacesContext facesContext) { return (ServletContext) facesContext.getExternalContext().getContext(); } public static Object getManagedBean(FacesContext ctx, String beanName) { return ctx.getApplication().getVariableResolver().resolveVariable(ctx, beanName); } /** * Get managed bean based on the bean name. * * @param beanName * the bean name * @return the managed bean associated with the bean name */ public static Object getManagedBean(String beanName) { return getManagedBean(FacesContext.getCurrentInstance(), beanName); } /** * Get managed bean based on the bean name. * * @param facesContext * FacesContext * @param beanName * the bean name * @return the managed bean associated with the bean name */ // public static Object getManagedBean(FacesContext facesContext, String beanName) { // Object o = getValueBinding(getJsfEl(beanName)).getValue(facesContext); // return o; // } /** * Remove the managed bean based on the bean name. * * @param beanName * the bean name of the managed bean to be removed */ public static void resetManagedBean(String beanName) { resetManagedBean(FacesContext.getCurrentInstance(), beanName); } /** * Remove the managed bean based on the bean name. * * @param facesContext * FacesContext * @param beanName * the bean name of the managed bean to be removed */ public static void resetManagedBean(FacesContext facesContext, String beanName) { getValueBinding(getJsfEl(beanName)).setValue(facesContext, null); } /** * Store the managed bean inside the session scope. * * @param beanName * the name of the managed bean to be stored * @param managedBean * the managed bean to be stored */ public static void setManagedBeanInSession(String beanName, Object managedBean) { setManagedBeanInSession(FacesContext.getCurrentInstance(), beanName, managedBean); } /** * Store the managed bean inside the session scope. * * @param beanName * the name of the managed bean to be stored * @param managedBean * the managed bean to be stored */ public static void setManagedBeanInSession(FacesContext facesContext, String beanName, Object managedBean) { facesContext.getExternalContext().getSessionMap().put(beanName, managedBean); } /** * Get parameter value from request scope. * * @param name * the name of the parameter * @return the parameter value */ public static String getRequestParameter(String name) { return getRequestParameter(FacesContext.getCurrentInstance(), name); } /** * Get parameter value from request scope. * * @param name * the name of the parameter * @return the parameter value */ public static String getRequestParameter(FacesContext facesContext, String name) { return (String) facesContext.getExternalContext().getRequestParameterMap().get(name); } /** * * @param locale * @return */ public static ResourceBundle getApplicationBundle(Locale locale) { return getApplicationBundle(FacesContext.getCurrentInstance(), locale); } /** * get application bundle * * @param facesContext * @param locale * @return */ public static ResourceBundle getApplicationBundle(FacesContext facesContext, Locale locale) { String bundleName = facesContext.getApplication().getMessageBundle(); if (bundleName != null) { try { return ResourceBundle.getBundle(bundleName, locale, Thread.currentThread().getContextClassLoader()); } catch (MissingResourceException e) { log.error("Resource bundle " + bundleName + " could not be found."); return null; } } else { return null; } } /** * get default bundle * * @param locale * @return */ public static ResourceBundle getDefaultBundle(Locale locale) { try { return ResourceBundle.getBundle(DEFAULT_BUNDLE, locale, FacesContext.class.getClassLoader()); } catch (MissingResourceException e) { log.error("Resource bundle " + DEFAULT_BUNDLE + " could not be found."); return null; } } /** * get current instance of Application * * @return current instance of Application */ public static Application getApplication() { ApplicationFactory appFactory = (ApplicationFactory) FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY); return appFactory.getApplication(); } /** * get ValueBinding by an EL expression which like "#{expression}" * * @param el * @return */ public static ValueBinding getValueBinding(String el) { return getApplication().createValueBinding(el); } /** * get the instanceof of HttpServletRequest * * @return */ public static HttpServletRequest getServletRequest() { return (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest(); } public static Object getElValue(String el) { return getValueBinding(el).getValue(FacesContext.getCurrentInstance()); } private static String getJsfEl(String value) { return "#{" + value + "}"; } /** * Add error message to a sepcific client. * * @param clientId * the client id * @param msg * the error message */ public static String getMessageByKey(String key) { String messageBundleName = FacesContext.getCurrentInstance().getApplication().getMessageBundle(); ResourceBundle resourceBundle = ResourceBundle.getBundle(messageBundleName); try { return resourceBundle.getString(key); } catch (Exception e) { return key; } } /** * Add error message. * * @param msg * the error message */ public static void addErrorMessage(String msg) { addErrorMessage(null, msg); } /** * Add error message to a sepcific client. * * @param clientId * the client id * @param msg * the error message */ public static void addErrorMessage(String clientId, String msg) { FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg)); } /** * find Component In Root By ID * * @param id * @return */ public static UIComponent findComponentInRoot(String id) { UIComponent ret = null; FacesContext context = FacesContext.getCurrentInstance(); if (context != null) { UIComponent root = context.getViewRoot(); ret = findComponent(root, id); } return ret; } private static UIComponent findComponent(UIComponent base, String id) { // Is the “base” component itself the match we are looking for? if (id.equals(base.getId())) { return base; } // Search through our facets and children UIComponent kid = null; UIComponent result = null; Iterator kids = base.getFacetsAndChildren(); while (kids.hasNext() && (result == null)) { kid = (UIComponent) kids.next(); if (id.equals(kid.getId())) { result = kid; break; } result = findComponent(kid, id); if (result != null) { break; } } return result; } }

例子程序：

package dwr; import java.util.List; import javax.faces.application.Application; import javax.faces.component.UIColumn; import org.apache.myfaces.component.html.ext.HtmlOutputText; import org.apache.myfaces.custom.checkbox.HtmlCheckbox; import commons.jsf.BasePageBean; import commons.jsf.CellCallBack; import commons.jsf.DataGird; import commons.jsf.DataGirdBean; import commons.jsf.DataPage; public class TestBean extends BasePageBean { @Override public void createDataTable() { DataGirdBean girdBean = new DataGirdBean(); String[] header = { "cust_no", "cust_name", "cust_addr", "linkman " }; girdBean.setDataTableHeader(header); girdBean.setDataTableValueBinding("#{TestBean.dataModel}"); DataGird gird = new DataGird(); this.dynamicGrid = gird.createDataPanel(girdBean); this.dynamicGrid = gird.createDataPanel(girdBean, new CellCallBack() { public UIColumn doCell(int index, Application app, String rowVar) { UIColumn column = new UIColumn(); HtmlOutputText o = new HtmlOutputText(); o.setValueBinding("value", app.createValueBinding("#{list[" + index + "]}")); return column; } }); } @Override protected DataPage getDataPage(int startRow, int pageSize) { List<Object[]> list = TestService.getInstance().getList(startRow, pageSize); int dataSetSize = TestService.getInstance().getCt(); // System.out.println("-------" + this.dataList.size() + "--" + dataSetSize); return new DataPage(dataSetSize, startRow, list); } }

package dwr; import java.util.ArrayList; import java.util.List; import commons.DbUtil; public class TestService { private static TestService instance = new TestService(); private String ctSQL = ""; private TestService() { } public List<Object[]> getList(int startRow, int endRow) { String sql = "select t.cust_no,t.cust_name,t.cust_addr,t.linkman from cust_info t"; this.ctSQL = "select count(*) from cust_info"; return DbUtil.query(sql, startRow, endRow); } public int getCt() { String ct = DbUtil.querySingleObj(ctSQL); return Integer.parseInt(ct); } public static TestService getInstance() { return instance; } }

package commons; import java.sql.CallableStatement; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import javax.sql.DataSource; import org.apache.commons.dbutils.DbUtils; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.ResultSetHandler; import org.apache.commons.dbutils.handlers.ArrayListHandler; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; import org.springframework.dao.DataAccessException; import org.springframework.jdbc.core.CallableStatementCreator; import org.springframework.jdbc.core.ConnectionCallback; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.PreparedStatementCallback; import org.springframework.jdbc.core.RowCallbackHandler; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.core.StatementCallback; import plmt.DbParam; import util.SpringFacesUtil; public class DbUtil { private static DataSource dataSource; private static JdbcTemplate jdbcTemplate; private static DbUtil instance = new DbUtil(); static { dataSource = (DataSource) SpringFacesUtil.getBean("dataSource"); jdbcTemplate = new JdbcTemplate(dataSource); } private DbUtil() { } /** * @return the dataSource */ public static DataSource getDataSource() { return dataSource; } @SuppressWarnings("unchecked") public static List<Object[]> query(String sql) { // System.out.println("SQL:" + sql); QueryRunner run = new QueryRunner(getDataSource()); List<Object[]> list = null; try { list = (List<Object[]>) run.query(sql, new ArrayListHandler()); } catch (SQLException e) { e.printStackTrace(); } return list; } @SuppressWarnings("unchecked") public static List<Object[]> query(String sql, int startRow, int endRow) { String sql1 = "select * from (select zx_page_table.*,rownum page_rownum from (" + sql + ") zx_page_table where rownum<=" + (endRow + startRow) + ") where page_rownum>=" + startRow + ""; System.out.println("SQL:" + sql1); return query(sql1); } public static String querySingleObj(String sql) { List<Object[]> l = query(sql); String v = null; if (l != null && l.size() > 0) { Object[] o = l.get(0); v = o[0] == null ? null : o[0].toString(); } return v; } /** * 调用存储过程 * * @param call * @param lidt */ public static void procedure(final String call, final List<DbParam> params) { getJdbcTemplate().execute(new ConnectionCallback() { public Object doInConnection(Connection conn) throws SQLException, DataAccessException { CallableStatement proc = null; proc = conn.prepareCall(call); int i = 1; if (params != null) { for (DbParam param : params) { proc.setString(i, (String) param.getParamValue()); i++; } } proc.execute(); return null; } }); } /** * 调用存储过程 * * @param call * @param lidt */ public static void procedure(final String call, final String[] params) { getJdbcTemplate().execute(new ConnectionCallback() { public Object doInConnection(Connection conn) throws SQLException, DataAccessException { CallableStatement proc = conn.prepareCall(call); int i = 1; if (params != null) { for (String param : params) { proc.setString(i, param); i++; } } proc.execute(); return null; } }); } public static void execute(String sql) { // System.out.println("SQL:" + sql); getJdbcTemplate().execute(sql); } public static void update(String sql) { // System.out.println("SQL:" + sql); getJdbcTemplate().execute(sql); } public static void update(final String[] sql) { // for (String string : sql) { // System.out.println("SQL:" + string); // } getJdbcTemplate().batchUpdate(sql); } public static Object[] toArray(ResultSet rs) throws SQLException { ResultSetMetaData meta = rs.getMetaData(); int cols = meta.getColumnCount(); Object[] result = new Object[cols]; for (int i = 0; i < cols; i++) { result[i] = rs.getObject(i + 1); } return result; } public static DbUtil getInstance() { return instance; } public static JdbcTemplate getJdbcTemplate() { return jdbcTemplate; } }

<%@ page language="java" contentType="text/html;charset=UTF-8"%> <%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%> <%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%> <%@taglib prefix="t" uri="http://myfaces.apache.org/tomahawk"%> <html> <head> </head> <f:view> <body> <h:form id="form1"> <t:panelGrid binding="#{TestBean.dynamicGrid}"></t:panelGrid> </h:form> </body> </f:view> </html>

其中DbUtil可以根据自己所使用的持久化方案来调整。

源代码<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> :https://p-blog.youkuaiyun.com/images/p_blog_youkuaiyun.com/myloon/EntryImages/20080718/commons.jpg</shapetype>

<shapetype stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">将jpg修改为zip</shapetype>

其中在backBean中可自定义实现每一个单元格填充的数据样式和修饰，如下：

this.dynamicGrid = gird.createDataPanel(girdBean, new CellCallBack() {

public UIColumn doCell(int index, Application app, String rowVar) {

UIColumn column = new UIColumn();

HtmlOutputText o = new HtmlOutputText();

o.setValueBinding("value", app.createValueBinding("#{list[" + index + "]}"));

return column;

}

});