ZK Spreadsheet Essentials/Working with ZK Spreadsheet/Bind Java Bean to ZK Spreadsheet/Integrate ZK Spreadsheet with Spring

This article is out of date, please refer to http://books.zkoss.org/wiki/ZK_Spreadsheet_Essentials for more up to date information.

Available in ZK Spreadsheet EE only

ZK Spreadsheet can resolve the name expressions in cells to bind the data from the Spring-managed beans automatically.

Purpose

Data binding spreadsheet cells to Spring-managed beans.

Template Excel File with Proper Name Expressions

Construct an Excel template file with proper name expressions in cells.

You will see #NAME? in cells because Excel does not know such names. However, they will be interpreted when import into ZK Spreadsheet component.

How ZK Spreadsheet Resolve my Spring-managed Beans

For variables in cells, if valid Excel Defined Names found in template file, ZK Spreadsheet will use them. If not, ZK Spreadsheet follows ZK's EL expression variable resolving mechanism. It first tries to find any matching zscript variables defined in ZUML page. Then check ids of ZK fellow components. Then search in ZK components' attribute map. Finally ask variable resolvers defined in the zul page to retrieve the bean of the named variable. If still none is found, it will return #NAME? as Excel's original behavior. Once variables are resolved, the associated getter are called and value returned in the cell.

So simply declare the variable-resolver with org.zkoss.zkplus.spring.DelegatingVariableResolver on top of your ZUML page, you are now data-binding your ZK Spreadsheet with your Spring-managed beans directly.

ZUML

In ZUML page, we declare the variable resolver for retrieving Spring-managed beans so ZK Spreadsheet can find them and show the evaluated value in the spreadsheet's cells.

<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
<spreadsheet id="bsheet"
    src="/WEB-INF/excel/bean/bsheet.xls"
    maxrows="200"
    maxcolumns="40"
    vflex="1"
    width="100%">
</spreadsheet>

Spring Configuration File

Define bean definitions in spring-config.xml file, and put it into your WEB-INF directory.

<?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="dataBean" class="org.zkoss.zssessentials.bean.spring.DataBeanImpl"/>
</beans>

Web Configuration File

In web.xml, a typical configuration for Spring Framework.

  ...
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring-config.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  ...

Spring-managed Bean

Define DataBean interface and its implementation. Mainly getters and setters for various attributes for a balance sheet.

DataBean.java

package org.zkoss.zssessentials.bean.spring;
public interface DataBean {
	public double getLiquidAssets();

	public void setLiquidAssets(double liquidAssets);

	//...other getters and setters
}

DataBeanImpl.java

package org.zkoss.zssessentials.bean.spring;
public class DataBeanImpl implements DataBean {
	private double liquidAssets;
	private double fundInvestment;
	private double fixedAssets;
	private double intangibleAsset; 
	private double otherAssets;
	private double currentLiabilities;
	private double longTermLiabilities;
	private double otherLiabilities;
	private double capitalStock;
	private double capitalSurplus;
	private double retainedEarnings;
	private double otherEquity;
	private double treasuryStock;
	
	public double getLiquidAssets() {
		return liquidAssets;
	}

	public void setLiquidAssets(double liquidAssets) {
		this.liquidAssets = liquidAssets;
	}

	//...other getters and setters implementation
}

Result

When Value of Spring-managed Bean Changes

Will ZK Spreadsheet update the cells if the value of the Spring-managed bean changes? Sure, but you have to notify the ZK Spreadsheet book for such cases.

	bsheet.getBook().notifyChange(new String[] {"dataBean"});

When you notify the ZK Spreadsheet work book model that Spring-managed beans with the specified names have changed, it will collect which cells are affected (i.e. those dependent cells with the specified Spring bean names), and publish data change event accordingly. The ZK Spreadsheet UI or any other components that have subscribed to the work book's event queue and are interested in the event will then retrieve the new cells' data from the beans and update themselves.

Version History

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All source code listed in this book is at Github.