通过HttpClient上传文件时我应该设置什么mimeType？

Question

我的代码如下。我发现使用此代码无法正确上载某些类型的文件，例如7-zip压缩文件。此外，还有一些正确上传。

发生此问题时，上载的文件大小小于整个文件。如果我更改了mime类型，则会更改上传的文件大小。

所以我猜这是mime类型的问题。我应该设置哪种mime类型来上传不同类型的文件？我应该为不同的文件类型单独设置，还是为所有文件类型设置一般类型？

public void DoUpload(String url, String filename) {
        HttpClient httpclient = new DefaultHttpClient();
        httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

        HttpPost httppost = new HttpPost(url);
        File file = new File(filename);

        MultipartEntity mpEntity = new MultipartEntity();
        ContentBody cbFile = new FileBody(file, "application/x-normal");
        mpEntity.addPart("userfile", cbFile);

        httppost.setEntity(mpEntity);
        //writeLog("executing request " + httppost.getRequestLine());

        initTime = System.nanoTime();
        try {
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity resEntity = response.getEntity();

                //writeLog(response.getStatusLine().toString());
                if (resEntity != null) {
                  //writeLog(EntityUtils.toString(resEntity));
                }
                if (resEntity != null) {
                  resEntity.consumeContent();
                }
                writeLog(String.format("Upload: [%s] Success!!! ...upload time: %d ms", 
                            file.toString(), (System.nanoTime()-initTime)/1000000));
        }
        catch (Exception e) {
            writeLog(String.format("Upload: [%s] FAILED!!! error: %s", file.toString(), e.toString()));
        }
        httpclient.getConnectionManager().shutdown();
}