Struts2 Json 获取基类的属性

  使用Struts2 JSON默认只能获取当前类(Action)的属性，对于基类的属性是屏蔽了的。例如：

public abstract class BaseAcion extends ActionSupport {
    private String result;
    private String message;

    //getters, setters
}

public class MyAction extends BaseAction {
    private String myFirstField;
    private String mySecondField;

    public String execute() {
         ...
         myFirstField = "someValue";
         mySecondField = "someOtherValue";
         ...
         result = SUCCESS;
         message = "Some message here";
         ...
         return result;
    }

    //methods, getters, setters
}

配置文件：

<package name="my-package" namespace="/" extends="json-default" >
    <action name="myAction" class="MyAction">
        <result type="json"></result>
    </action> 
</package>

请求Action返回的JSON里只有：

{
    "myFirstField":"someValue",
    "mySecondField":"someOtherValue"
}

而没有包括BaseAction的resulthe和message。

若需要JSON同时获取基类的属性，需要设置：

<result type="json">
  <param name="ignoreHierarchy">false</param>
</result>

详细可参考JSONPlugin

另外的写法是：

@ParentPackage("json-default")
@Result(name="success", type="json", params={"noCache","true", "ignoreHierarchy","false"})
@SuppressWarnings("serial")
public class MyAction extends BaseAction {
    private String myFirstField;
    private String mySecondField;

    public String execute() {
         ...
         myFirstField = "someValue";
         mySecondField = "someOtherValue";
         ...
         result = SUCCESS;
         message = "Some message here";
         ...
         return result;
    }

    //methods, getters, setters
}