android - Android 中 MultiPart 可编译方法的 NoClassDefFoundError

Question

我正在处理以下问题:当尝试通过 MultiPart 实体上传图像时，似乎 HttpClient/MIME 上的几个更新正在破解一切。我正在尝试以下代码，但它因 NoClassDefFoundError 而失败:

public static void executeMultipartPost(File image, ArrayList<Cookie> cookies, String myUrlToPost) {
    try {
        // my post instance
        HttpPost httppost = new HttpPost(myUrlToPost);
        // setting cookies for the connection session
        if (cookies != null && cookies.size() > 0) {
            String cookieString = "";
            for (int i=0; i<cookies.size(); ++i) {
                cookieString += cookies.get(i).getName()+"="+cookies.get(i).getValue()+";";
            }
            cookieString += "domain=" + BaseUrl + "; " + "path=/";
            httppost.addHeader("Cookie", cookieString);
        }
        // creating the http client
        HttpClient httpclient = new DefaultHttpClient();
        // creating the multientity part [ERROR OCCURS IN THIS BELLOW LINE]
        MultipartEntity multipartEntity = new MultipartEntity();
        multipartEntity.addPart("photoupload", new FileBody(image));
        httppost.setEntity(multipartEntity);
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity resEntity = response.getEntity();
    } catch (Exception e) {}
}

此方法完全可编译并使用 httpclient-4.0.1.jar和 httpmime-4.2.jar libs，但同样，它在我的注释行上崩溃了。

我错过了什么吗？

Answer 1

好的，here你有 Multipart post 所需的库，所有功劳都归功于 Satya Komatineni 和 David Maclean，Pro Android 3 和现在 4 的作者，我引用他们的书

To do multipart POST calls, you need to get three additional Apache open source projects: Apache Commons IO, Mime4j, and HttpMime. You can download these projects from the following web sites: Commons IO: http://commons.apache.org/io/ Mime4j: http://james.apache.org/mime4j/ HttpMime: http://hc.apache.org/downloads.cgi (inside of HttpClient)