ZK Spring Essentials/Working with ZK Spring/Working with ZK Spring Core/Using Custom ZK Scopes For Spring Beans

Purpose

Use ZK custom scope for Spring beans.

Example

In this example we will present user to enter a message which can be set into a Spring bean. This bean is set to the custom desktop-scope so that it can be shared by other pages, controllers, view models attached to this same desktop.

Configuration

Java Config

import org.zkoss.spring.config.ZkScopesConfigurer;

@Configuration
@Import(ZkScopesConfigurer.class)
public class YourApplicationConfiguration {
    ...
}

XML Config

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core-4.0.xsd">

	<!-- Enables ZK custom scopes for Spring Beans -->
	<zksp:zk-config/>
</beans>

Previous version 3.2 (or earlier)

To enable ZK custom scopes for your Spring Beans all you need is to add <zk-config/> element to your spring bean configuration file. Here is snippet from our sample application configuration

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:zksp="http://www.zkoss.org/2008/zkspring/core"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.zkoss.org/2008/zkspring/core http://www.zkoss.org/2008/zkspring/core/zkspring-core.xsd">

    <!-- Enables ZK custom scopes for Spring Beans -->
    <zksp:zk-config/>
...

Note that you need to declare ZK Spring Core namespace at the start of your configuration file.

ZUML

Let's take a look at the main page source

<?xml version="1.0" encoding="UTF-8"?>
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
<window title="Custom Scopes Example - Main Page" border="normal" height="100px" width="400px" 
    apply="${scopesCtrl}">
    <label value="Enter Message Text:"></label>
    <textbox id="name" />
    <button id="setMsgBtn" label="Set" />
    <button id="showMsgBtn" label="Show Message" />
    <button id="showWinBtn" label="Show Window" />
</window>

It has one textbox to enter a message. On clicking Set button we store this text in a SimpleMessageBean which is Autowired into scopesCtrl controller.

Java

Here is the SimpleMessageBean source and you can see its scope is set to "desktop" scope using Scope annotation.

@Component("msgBean")
@Scope("desktop")
public class SimpleMessageBean {

    private String msg;
    
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

Here is the controller source in which SimpleMessageBean is autowired.

@Component("scopedCtrl")
@Scope("prototype")
public class ScopedController extends SelectorComposer {

    @AutoWired
    private SimpleMessageBean msgBean; //wire spring bean

    @Wired
    private Textbox name; //wire ZK component

    @Listen("onClick = #setMsgBtn")
    public void setMessage(Event evt) {
        msgBean.setMsg(name.getValue());
    }
    
    @Listen("onClick = #showMsgBtn")
    public void showMessage(Event evt) throws InterruptedException {
        Messagebox.show(msgBean.getMsg());
    }

    @Listen("onClick = #showWinBtn")
    public void showMessage(Event evt) throws InterruptedException {
        Window win = (Window) Executions.getCurrent().createComponents("customScopesWindow.zul", null, null);
        win.doHighlighted();
    }
}

Now when you click Show window button on the main page it creates a new page called customScopesWindow.zul and attaches it to the current desktop. Here is the source code for this page

<?xml version="1.0" encoding="UTF-8"?>
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>
<window title="Custom Scopes Example - Window Page" border="normal" height="100px"
    width="400px" closable="true">
    <label value="Message Text:"></label>
    <textbox id="name" value="${msgBean.msg}"/>
</window>

Since it is attached to the same desktop we have access SimpleMessageBean instance stored in the desktop scope. We use our standard approach to use DelegatingVariableResolver to access such bean and assign its value to a textbox.

Version History

Version	Date	Content