编写Service文件
新建一个php文件，命名为EmployeeService.php。首先写上这一句，include必要的支持代码：
require_once 'MSAjaxService.php';
然后定义一个Employee类。四个属性一目了然，不用多说：
class Employee
{
public $Id;
public $Name;
public $Email;
public $Salary;
function __construct($id, $name, $email, $salary)
{
$this->Id = $id;
$this->Name = $name;
$this->Email = $email;
$this->Salary= $salary;
}
}
接下来是EmployeeService类，继承与MSAjaxService.php中的MSAjaxService基类。其中定义一个方法，用来返回一个Employee对象：
class EmployeeService extends MSAjaxService
{
function GetEmployee()
{
return new Employee(12345, "Dflying Chen", "
[email protected]", 1000);
}
}
然后新建一个EmployeeService的实例，并且调用基类的ProcessRequest()方法，处理该请求：
$theService = new EmployeeService();
$theService->ProcessRequest();
大功告成！
