Question

我一直在通过HttpURLConnection关注上传文件的步骤outlined here。在我的例子中，有一个名为“json”的POST参数，需要退出服务器上的_POST['json']。

问题是，_POST['json']中没有任何内容，除非我尝试上传文件;文件数据放在_POST['json']中，而不是_FILES['filename']。

目标是实现这一目标：

_POST['json'] = {"fileData":"Some extra data about the file(s)"}
_FILES['filename'] = the file I uploaded.

我构建请求的代码是：

try {
            url  = new URL(_requestObject.getUrl());
            conn = (HttpURLConnection)url.openConnection();

            conn.setRequestProperty("Content-Type", MMWebAPIConstants.MM_REQUEST_CONTENT_TYPE_HF + MMWebAPIConstants.MM_REQUEST_BOUNDARY);
            conn.addRequestProperty("Connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);

            if ( ! _requestObject.getAction().equals(MMWebAPIConstants.ACTION_LOGIN) ) {
                for ( String cookie : MMSessionManager.getSharedInstance().getCookies() )
                    conn.addRequestProperty("Cookie", cookie);
            }

            outstream = conn.getOutputStream();
            writer    = new PrintWriter(new OutputStreamWriter(outstream, "UTF-8"), true);

            writer.append("--" + MMWebAPIConstants.MM_REQUEST_BOUNDARY).append(crlf);
            writer.append("Content-Disposition: form-data; name=\"json\"").append(crlf);
            writer.append("Content-Type: text/plain; charset=UTF-8").append(crlf);
            writer.append(postValue.toString()).append(crlf).flush();

            if ( hasfiles ) {
                byte[]      bytes = null;
                InputStream input = null;

                for ( String filename : _requestObject.getFilePaths() ) {
                    String filepath = this.getContext().getFilesDir().getAbsolutePath() + "/" + filename;
                    String type     = URLConnection.guessContentTypeFromName(filename);
                    bytes           = new byte[5120];
                    input           = new FileInputStream(filepath);

                    writer.append("--" + MMWebAPIConstants.MM_REQUEST_BOUNDARY).append(crlf);
                    writer.append("Content-Disposition: form-data; name=\"" + filename + "\"; filename=\"" + filename + "\"").append(crlf);
                    writer.append("Content-Type: " + type).append(crlf);
                    writer.append("Content-Transfer-Encoding: binary").append(crlf);
                    writer.append(crlf).flush();

                    for ( int l = 0; (l = input.read(bytes)) > 0; ) {
                        outstream.write(bytes, 0, l);
                    }

                    outstream.flush();
                    writer.append(crlf).flush();
                }
            }

            writer.append("--" + MMWebAPIConstants.MM_REQUEST_BOUNDARY + "--").append(crlf);

            responseObject = this.getResponse(conn);

            this.getCookiesFromRequest(conn);

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if ( writer != null ) writer.close();
            if ( conn != null ) conn.disconnect();
        }

帖子和文件数组看起来像：

ERROR - 2012-08-02 18:49:59 --> POST: Array
(
    [json] => PNG


IHDR#JzsBIT|d
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9J2O; e:=Md?DI{a;Lr56xA+~ҍZO|{orB{Iu<VkWL<x<m=+ȡhE5$:ͲI\k `9_5Ofx7EX"D#'NO:ƧjS+uj:gjP=,rɳW3I    s>DM4ޖ)մ_*``@JZ6(ʝZ3\ u5삮*rת@Rkc$o=JRs$%aϮi]ځl;]Q7lI6K  \ `L?OAsشZQOٍߍ*Y7VyoZuJYq,iM`SyYUSJfjѮf["0%y5N_0Z5"\ߚ$/fC!-ca^Mpfizvߚ???,)ak"_bUE>ml,BcMSB[7y')O7I7c>m3;Or6]qrAfe8t]I>0Zc!6Ϡ8
YT0\YA\?<#'GXGI^c"<Ͳ]cU;k$'y/z$Ƣ&N g<-0Џr'IRJAŗ9|ʉj3IL[Yo<fugq2;-acY[cw/Ô#,U /X"0x,k>uF&LRN$snu;דO    ~M</aSQ[Sy˶<*z`(RByP4Wh `L1=X   s3ٖ'9VaJ WML
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 ס
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)

ERROR - 2012-08-02 18:49:59 --> FILES: Array
(
)

更新：

作为试用版，我尝试了this thread（它引发了运行时异常），我尝试了没有文件上传，但没有填充_POST['json']，但仍然引发了运行时异常。

请寻求一些帮助。

Answer 1

看起来您没有正确添加帖子参数。你需要Post Parameters。

请参阅：Using HttpClient and HttpPost in Android with post parameters

HttpURLConnection不发送发布数据

1 个答案: