是否有一种方便的方法来为struts2中的json结果配置noCache和excludeNullProperties参数?

问题描述

我正在将struts-json-plugin.2.2.3用于结果类型为json的操作，这是一个演示配置:

I am using struts-json-plugin.2.2.3 for Actions whose result type is json, here is an demo configuration:

<action name="dept_*" class="com.XXX.action.DepartmentAction" method="{1}">
        <result name="search">dept_search.jsp</result>
        <result name="search_ajax" type="json"><param name="root">deptList</param><param name="excludeNullProperties">true</param><param name="noCache">true</param></result>
        <result name="save" type="json"><param name="root">jsonResult</param><param name="excludeNullProperties">true</param><param name="noCache">true</param></result>
        <result name="count" type="json"><param name="root">pageCount</param><param name="excludeNullProperties">true</param><param name="noCache">true</param></result>
    </action>

此配置工作正常.但是对于我项目中的所有Action，noCache和excludeNullProperties都具有与上面的代码相同的配置值，因此我正在寻找一种将它们配置在一个地方并用于所有地方的方法.我在JSONInterceptor类中找到了相同的名称属性，因此我将其配置为:

This configuration works fine. But for all Actions in my project, noCache and excludeNullProperties have same configuration value just like code above, so I am searching a way to configure them in one place and used for all. I find in JSONInterceptor class, there are same name properties, so I configured like this:

  <interceptors>
        <interceptor-stack name="ecsStack">
            <interceptor-ref name="defaultStack"></interceptor-ref>
            <interceptor-ref name="json"><param name="noCache">true</param><param name="excludeNullProperties">true</param><param name="contentType">application/json;charset=utf-8</param></interceptor-ref>
        </interceptor-stack>
    </interceptors>

    <default-interceptor-ref name="ecsStack"></default-interceptor-ref>

并删除Action result中的相同配置，但是不能按预期工作，响应标头中没有cache-control，expires和pragma信息，并且将null属性发送到浏览器.那么为什么它不起作用?
是否有方便的方法来配置这两个参数?

And remove same configurations in Action result, but it does not work as expected, there is no cache-control, expires and pragma information in response headers, and null properties are sent to browser.So why it does not work?
If there is a convenient way to configure these two parameters?

推荐答案

在struts.xml文件中尝试以下result-type配置:

Try this result-type configuration in struts.xml file:

<result-type name="json" class="org.apache.struts2.json.JSONResult">
  <param name="noCache">true</param>
  <param name="excludeNullProperties">true</param>
</result-type>

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