Struts2 JSON拦截器没有填充我的Action类 [英] Struts2 JSON interceptor not populating my Action class

问题描述

我正在开发一个Web应用程序，其中客户端JavaScript库（ExtJS）使用JSON请求有效负载向启用Struts的后端发送请求。我的问题是我无法弄清楚如何将有效载荷中的变量导入我的Action类。

I am working on a web app in which the client JavaScript library (ExtJS) sends requests to my Struts-enabled backend with a JSON request payload. My problem is that I can't figure out how to get the variables from the payload into my Action class.

我从使用日志语句知道我的正确方法前端正在调用action类。只是我期待的变量是 null ，当它们不应该是。

I know from using log statements that the correct method in my action class is being called by the frontend. It's just that the variables I am expecting are null when they shouldn't be.

我正在尝试使用 struts2-json-plugin 作为拦截器。 Struts拦截器对我来说是新手，我无法在网上找到任何关于以这种方式使用 struts2-json-plugin 的明确示例。

I'm trying to use struts2-json-plugin as an interceptor. Struts interceptors are new to me, and I haven't been able to find any clear examples on the web about using struts2-json-plugin in this way.

以下是我的 pom.xml中的Struts依赖项：

<dependency>
  <groupId>org.apache.struts</groupId>
  <artifactId>struts2-core</artifactId>
  <version>2.2.3.1</version>
</dependency>
<dependency>
   <groupId>org.apache.struts</groupId>
   <artifactId>struts2-json-plugin</artifactId>
   <version>2.2.3.1</version>
</dependency>        

这是请求正文（照顾Firebug）：

Here is the request body (care of Firebug):

{"id":15,"translation":"Blah blah"}

我的Action类的相关部分如下所示：

The relevant parts of my Action class look like this:

public class TranslationsAction extends ActionSupport {

    private Long id;
    private String translation;

    public String save() throws Exception {

        log.debug("TranslationsAction.save() called.");
        log.debug("ID: " + this.id + ", Translation: " + this.translation);

        return "{\"foo\":\"bar\"}";
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setTranslation(String translation) {
        this.translation = translation;
    }

}

这是我的相关部分 struts.xml ：

<package name="foo" namespace="/foobar" extends="json-default">    
    <action name="save-translation" method="save"
            class="my.package.name.action.TranslationsAction">
        <result name="success">/jsp/json.jsp</result>
    </action>
</package>

任何想法？

推荐答案

我自己发现了这个问题。我无法正确配置 struts.xml 。我需要首先在我的包中定义一个拦截器，然后告诉我的操作使用它，如：

I found the problem myself. I had failed to configure struts.xml properly. I needed to first define an interceptor within my package, and then tell my action to use it, as in:

<package name="foo" namespace="/foobar" extends="json-default">    

    <!-- Added this: -->
    <interceptors>
        <interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
    </interceptors>

    <action name="save-translation" method="save"
            class="my.package.name.action.TranslationsAction">

        <!-- And added this: -->
        <interceptor-ref name="myDefaultInterceptorStack" />
        <interceptor-ref name="json" />

        <result name="success">/jsp/json.jsp</result>
    </action>
</package>

这对我来说是一个愚蠢的疏忽。 ：-\

It was a silly omission on my part. :-\

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