zk框架之Connecting to Java World
一、EL表达式在页面上被访问到时会被当做server，因此它可以访问下面的：
1、Components by using its id
2、variables defined in zscript
3、隐含对象
<window title="EL">
<textbox id="tb" value="${self.parent.title}"/>
${tb.value}
<button label="Enter" if="${not empty param.edit}"/>
<zscript>Date now = new Date();</zscript>
<datebox value="${now]"/>
</window>
二、Variable Resolver
三、Associate with java method
引用static的方法，如下：
package com.jing.zk;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class Customer {
private String name;
private String age;
public static Collection<Customer> getAll(String condition){
List<Customer> customerList = new ArrayList<Customer>();
Customer c = new Customer();
c.setName("王京晶");
c.setAge("24");
Customer c1 = new Customer();
c1.setName("王伟");
c1.setAge("23");
customerList.add(c);
customerList.add(c1);
return customerList;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
zul文件如下：
<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<?xel-method prefix="c" name="getAllCustomers" class="com.jing.zk.Customer"
signature="java.util.Collection getAll(java.lang.String)"?>
<zk>
<window title="new page title" border="normal">
<listbox >
<listitem label="${ each.name}" forEach="${c:getAllCustomers('*') }"> </listitem>
</listbox>
</window>
</zk>
四、Associate with multiple java method
<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<?taglib uri="/WEB-INF/tld/my.tld" prefix="my"?>
<zk>
<window title="new page title" border="normal">
<listbox >
<listitem label="${ each.name}" forEach="${my:getAllCustomers('*') }"> </listitem>
</listbox>
</window>
</zk>
其中，my.tld文件如下：
<taglib>
<function>
<name>getAllCustomers</name>
<function-class>com.jing.zk.Customer</function-class>
<function-signature>java.util.Collection getAll(java.lang.String)</function-signature>
</function>
<!-- any member of functions are allowed -->
</taglib>