没有struts标签的struts 2文件上传 [英] struts 2 file upload without struts tags

问题描述

我需要使用struts标签

 < s：form action =doUploadmethod =post enctype =multipart / form-data> 
< s：file name =uploadlabel =File/> 
< s：submit /> 
< / s：form> 
  

利用 struts 2提供的文件上传功能？如果没有struts 2标签，我可以实现相同的功能吗？如果是的话，我可以知道约定需要在行动中或在配置文件中实现相同吗？

解决方案

， 您可以。然后动作使用的配置和约定保持不变。

如果使用< form 标签，那么您应该将动作属性值与映射到动作的路径一起放置。有关动作映射程序如何工作的详细信息，并将路径翻译为 ActionMapping ，请参阅 here。

在form标签中，应该放置 enctype =multipart / form-data，所以Struts可以把http请求包装到 MultipartRequestWrapper 并解析表单数据。然后 fileUpload 拦截器将参数添加到 params 拦截器将文件属性注入处理上传的操作。

$ b code> input 标签应该对应于属性 File 类型的名称。它由上面的两个拦截器使用，最后通过OGNL注入对象。

如果需要多个文件上传，则应该更改属性类型以处理集合对象。看起来这是在示例中完成的。

Do I need to make use the struts tags

<s:form action="doUpload" method="post" enctype="multipart/form-data">
    <s:file name="upload" label="File"/>
    <s:submit/>
</s:form>

to make use of File upload functionality that struts 2 is providing ? Can I achieve the same functionality without struts 2 tags ? if yes can i know the conventions need to be incorporated in action or in configuration files to achieve the same ?

解决方案

Shortly, yes, you can. Then the configuration and conventions used by the action remains the same.

If you use the <form tag then you should place the action attribute value with the path that map to the action. More about how the action mapper works and translates the path to the ActionMapping see here.

In the form tag you should place the enctype="multipart/form-data", so the Struts is able to wrap the http request to the MultipartRequestWrapper and parse form data. Then fileUpload interceptor adds parameters to the action context needed for the params interceptor to inject the file properties to the action that handles uploading.

The name of the input tag should correspond the name of the property File type. It's used by both interceptors above and finally the object is injected via OGNL.

If you need multiple files upload then you should change the properties type to be able to handle a collection of objects. Look like it's done in this example.

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