java - App-Engine (Java) 文件上传

Question

我使用以下示例成功地在 App-Engine 上上传了文件:

How to upload and store an image with google app engine (java)

和

How to upload pics in appengine java

问题是，我正在提交其他字段以及文件字段，如下所示:

<form action="index.jsp" method="post" enctype="multipart/form-data">
    <input name="name" type="text" value=""> <br/>
    <input name="imageField" type="file" size="30"> <br/>
    <input name="Submit" type="submit" value="Sumbit">
</form>

在我的 servlet 中，我在查询时得到 null

name = request.getParameter("name");

为什么会这样？有没有办法检索文本字段值？

Answer 1

您必须通过 FileItemIterator。在您提到的示例中，仅处理图像 (FileItemStream imageItm = iter.next();)。

// From the example: http://stackoverflow.com/questions/1513603/how-to-upload-and-store-an-image-with-google-app-engine-java
FileItemIterator iter = upload.getItemIterator(req);
// Parse the request
while (iter.hasNext()) {
    FileItemStream item = iter.next();
    String name = item.getFieldName();
    InputStream stream = item.openStream();
    if (item.isFormField()) {
        System.out.println("Form field " + name + " with value "
            + Streams.asString(stream) + " detected.");
    } else {
        // Image here.
        System.out.println("File field " + name + " with file name "
            + item.getName() + " detected.");
        // Process the input stream
        ...
    }
}

参见 http://www.jguru.com/faq/view.jsp?EID=1045507了解更多详情。