action向页面传递数据，拦截那些没必要传到客户端的方法。includeProperties

如果action的属性很多，我们想要从Action返回到调用页面的数据。这个时候配置includeProperties或者 excludeProperties拦截器即可。而这2个拦截器的定义都在struts2的json-default包内，所以要使用该拦截器的包都要继承自json-default。

< struts >
    < constant value = "spring" name = "struts.objectFactory" />
    < include file = "struts-admin.xml" ></ include >
    < package name = "default" extends = "json-default" >
        < action class = "com.person.PersonAction" name = "person" method = "view" >
            < result type = "json" >
                < param name = "includeProperties" >person\.name,persoon\.age,person\.gender </ param >
            </ result >
        </ action >
    </ package >
</ struts >

经过测试，下面的设置也是可以的，就是在includeProperties里面直接写你所在Action的属性

< struts >
    < constant value = "spring" name = "struts.objectFactory" />
    < include file = "struts-admin.xml" ></ include >
    < package name = "default" extends = "json-default" >
        < action class = "com.person.PersonAction" name = "person" method = "view" >
            < result type = "json" >
                < param name = "includeProperties" >name,age,gender </ param >
            </ result >
        </ action >
    </ package >
</ struts >

利用Struts 2的支持的可配置结果，可以达到过滤器的效果。Action的处理结果配置支持正则表达式。但是如果返回的对象是一个数组格式的Json数据。比如 peson Bean中有对象persion1…person9，而我只要JSON插件，则可以用如下的正则表达式。

< struts >
    < constant value = "spring" name = "struts.objectFactory" />
    < include file = "struts-admin.xml" ></ include >
    < package name = "default" extends = "json-default" >
        < action class = "com.person.PersonAction" name = "person" method = "view" >
            < result type = "json" >
                < param name = "includeProperties" >person\.name,persoon\.age,person\.gender </ param >
            </ result >
        </ action >
    </ package >
</ struts >
<!--利用Struts 2的支持的可配置结果，可以达到过滤器的效果。Action的处理结果配置支持正则表达式。 但是如果返回的对象是一个数组格式的Json数据。比如peson Bean中有对象persion1...person9，而我只要person1的json数据， 则可以用如下的正则表达式。 -->
< struts >
    < constant value = "spring" name = "struts.objectFactory" />
    < include file = "struts-admin.xml" ></ include >
    < package name = "default" extends = "json-default" >
        < action class = "com.person.PersonAction" name = "person" method = "view" >
            < result type = "json" >
                < param name = "includeProperties" >person\[\d+\]\.person1 </ param >
            </ result >
        </ action >
    </ package >
</ struts >
<!--excludeProperties拦截器的用法与此类同，如果拦截的仅仅是一个对象，如果拦截掉person Bean的整个对象。 -->
< struts >
    < constant value = "spring" name = "struts.objectFactory" />
    < include file = "struts-admin.xml" ></ include >
    < package name = "default" extends = "json-default" >
        < action class = "com.person.PersonAction" name = "person" method = "view" >
            < result type = "json" >
                < param name = "excludeProperties" >person </ param >
            </ result >
        </ action >
    </ package >
</ struts >

     传递List或者对象是，后面要加上  .*   代表全部的意思。

<param name="includeProperties">topicList.*</param> 

需要注意的是,如果用JSON插件把返回结果定为JSON。而JSON的原理是在ACTION中的get方法都会序列化，所以前面是get的方法只要没指定不序列化，都会执行，那么可以在该方法的前面加注解声明该方法不做序列化。

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@JSON (serialize = false ) public User getUser() { return this .User; } @JSON (format = "yyyy-MM-dd" ) public Date getStartDate() { return this .startDate; }