java - Multipart ServletWebRequest.getFiles() 返回空映射

Question

在 Wicket 1.5 中，我们以这种方式处理上传的文件:

public UploadValuePage(PageParameters parameters) {
    super(parameters);
    Bytes maxSize = Bytes.kilobytes(20000);
    ServletWebRequest swr = (ServletWebRequest) getRequest();
    MultipartServletWebRequest mswr = swr.newMultipartWebRequest(maxSize, "uploadId");
    FileItem item = mswr.getFile("fileInput").get(0);
    // process item
}

但是迁移到 Wicket 6 后 map 中没有文件。为什么？

Answer 1

在网上搜索后，我发现了这个:
http://wicketinaction.com/2012/11/uploading-files-to-wicket-iresource/

因此，从 Wicket 6.18.0 开始，我们需要额外的一行:

public UploadValuePage(PageParameters parameters) {
    super(parameters);
    Bytes maxSize = Bytes.kilobytes(20000);
    ServletWebRequest swr = (ServletWebRequest) getRequest();
    MultipartServletWebRequest mswr = swr.newMultipartWebRequest(maxSize, "uploadId");
    mswr.parseFileParts(); // since Wicket 6.18.0
    FileItem item = mswr.getFile("fileInput").get(0);
    // process item
}