package dayday.controll;

 import com.opensymphony.xwork2.ActionSupport;

 import com.opensymphony.xwork2.ModelDriven;

 import dayday.model.Product;

 import dayday.model.Suggest;

 import dayday.service.AddSuggest;

 /**

  * Created by I am master on 2017/2/22.

  */

 public class SuggestAction extends ActionSupport{

     //保存对象的信息

     private Suggest suggest;

     private AddSuggest addSuggest;

     private String sugName;

     private String sugEmail;

     private String sugPhone;

     private String sugContent;

     public String getSugName() {

         return sugName;

     }

     public void setSugName(String sugName) {

         this.sugName = sugName;

     }

     public String getSugEmail() {

         return sugEmail;

     }

     public void setSugEmail(String sugEmail) {

         this.sugEmail = sugEmail;

     }

     public String getSugPhone() {

         return sugPhone;

     }

     public void setSugPhone(String sugPhone) {

         this.sugPhone = sugPhone;

     }

     public String getSugContent() {

         return sugContent;

     }

     public void setSugContent(String sugContent) {

         this.sugContent = sugContent;

     }

     @Override

     public String execute()throws Exception{

         suggest.setSugContent(getSugContent());

         suggest.setSugEmail(getSugEmail());

         suggest.setSugName(getSugName());

         suggest.setSugPhone(getSugPhone());

         addSuggest.insertSuggest(suggest);

         return SUCCESS;

     }

 }

 package dayday.controll;

 import com.opensymphony.xwork2.ActionSupport;

 import com.opensymphony.xwork2.ModelDriven;

 import dayday.model.Product;

 import dayday.model.Suggest;

 import dayday.service.AddSuggest;

 /**

  * Created by I am master on 2017/2/22.

  */

 public class SuggestAction extends ActionSupport implements ModelDriven<Suggest>{

     //保存对象的信息

     private Suggest suggest;

     private AddSuggest addSuggest;

     @Override

     public String execute()throws Exception{

         addSuggest.insertSuggest(suggest);

         return SUCCESS;

     }

     @Override

     public Suggest getModel() {

         suggest=new Suggest();

         return suggest;

     }

 }

 1). 先会执行 ModelDrivenInterceptor 的 intercept 方法. 

     public String intercept(ActionInvocation invocation) throws Exception {

         //获取 Action 对象: SuggestAction 对象, 此时该 Action 已经实现了 ModelDriven 接口

         //public class SuggestAction extends ActionSupport, implements ModelDriven<Employee>

         Object action = invocation.getAction();

         //判断 action 是否是 ModelDriven 的实例

         if (action instanceof ModelDriven) {

             //强制转换为 ModelDriven 类型

             ModelDriven modelDriven = (ModelDriven) action;

             //获取值栈

             ValueStack stack = invocation.getStack();

             //调用 ModelDriven 接口的 getModel() 方法

             //即调用 EmployeeAction 的 getModel() 方法

             /*

             public Employee getModel() {

                 employee = new Employee();

                 return employee;

             }

             */

             Object model = modelDriven.getModel();

             if (model !=  null) {

                 //把 getModel() 方法的返回值压入到值栈的栈顶. 实际压入的是 EmployeeAction 的 employee 成员变量

                 stack.push(model);

             }

             if (refreshModelBeforeResult) {

                 invocation.addPreResultListener(new RefreshModelBeforeResult(modelDriven, model));

             }

         }

         return invocation.invoke();

     }

 2). 执行 ParametersInterceptor 的 intercept 方法: 把请求参数的值赋给栈顶对象对应的属性. 若栈顶对象没有对应的属性, 则查询

 值栈中下一个对象对应的属性...

 3). 注意: getModel 方法不能提供以下实现. 的确会返回一个 Suggest 对象到值栈的栈顶. 但当前 Action

 的 suggest 成员变量却是 null. 

 public Suggest getModel() {

     return new Suggest();

 }