Salesforce 使用StandardController 在后台类中获取当前记录Id

public class AddressInfoController {
    //带有特定参数的构造函数
    public AddressInfoController(ApexPages.StandardController controller)
    {
	contractId = controller.getId();
	//获取记录 controller.getRecord();
	record = ApexPages.currentPage().getParameters().get('RecordType');
    }
}