使用Jersey上传文件：FormDataContentDisposition为null [英] File upload with Jersey : FormDataContentDisposition is null

问题描述

我正在尝试使用Jersey实现文件上传，所以我按照这个例子：
http://www.mkyong.com/webservices/jax-rs/file-upload-example-in-jersey/
哪个适用于HTML页面。现在我将它改编为我的应用程序，这里是代码：

I'm trying to implement file upload with Jersey so I followed this example : http://www.mkyong.com/webservices/jax-rs/file-upload-example-in-jersey/ which worked well with an HTML page. Now I adapted it to my application, here is code :

  public Response uploadFile(
    @FormDataParam("file") InputStream uploadedInputStream,
    @FormDataParam("file") FormDataContentDisposition fileDetail)
    throws IOException {

Response.Status respStatus = Response.Status.OK;

if (fileDetail == null) {
    respStatus = Response.Status.INTERNAL_SERVER_ERROR;
} else {
    try {
    initPath();
    if (fileDetail.getSize() > OntoWebStudioUtil
        .getUploadFileLimit()) {
        respStatus = Response.Status.NOT_ACCEPTABLE;
        return Response.status(respStatus).build();
    }

    writeToFile(uploadedInputStream, tempDirectory);
    } catch (Exception e) {
    respStatus = Response.Status.INTERNAL_SERVER_ERROR;
    e.printStackTrace();
    }
}
return Response.status(respStatus).build();
}

但是使用调试视图，一旦我上传了我的图片并按下按钮发送和然后到这里，uploadedInputStream和fileDetail都为null。所以我无能为力......
我是Servlet的初学者，然后是REST，所以请放纵。

But with debug view, once I uploaded my picture and pushed the button send and then get here, uploadedInputStream and fileDetail are null. So I can do nothing... I am a beginner with Servlet and then REST, so please be indulgent.

谢谢。

推荐答案

我发现为什么它无法正常工作：
这是因为你在FormDataParameter之后选择的名字（ myForm）必须与您在HTML表单中选择的名称相同（name =myForm）

I found why it wasn't working : It is because the name you choose after the FormDataParameter("myForm") has to be the same as the name you choosed in your HTML form (name = "myForm")

所以，

@FormDataParam("myForm") InputStream uploadedInputStream,
@FormDataParam("myform") FormDataContentDisposition fileDetail)

表格必须类似于

    <form action=".../rest/fileupload" method="post" enctype="multipart/form-data">
   <p>
    Select a file : <input type="file" name="myForm"/>
   </p>
   <input type="submit" value="Upload It" />
</form>

希望它能帮助像我这样的其他初学者：）

Hope it will help some other beginners like me :)

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