Java-将文件上载到URL的post请求

我正在寻找使用POST请求将文件上传到服务器的可能性

我一直在尝试使用restTemplates，但不起作用，然后我尝试使用以下代码：

HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

    String urlParam = "http://myURL";

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

    MultipartEntity mpEntity = new MultipartEntity();
    ContentBody cbFile = new FileBody(file, "image/jpeg");
    mpEntity.addPart("file", cbFile);

    ArrayList<NameValuePair> postParameters;
    postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("id_category", "0"));
    postParameters.add(new BasicNameValuePair("token", "c4c533d2825f8791a07265d812d62d90"));
    postParameters.add(new BasicNameValuePair("tab", "AP"));
    postParameters.add(new BasicNameValuePair("action", "addImage"));
    postParameters.add(new BasicNameValuePair("action", "addImage"));
    postParameters.add(new BasicNameValuePair("qqfile", "IMG_0599.jpg"));

    httppost.setEntity(new UrlEncodedFormEntity(postParameters));

    Header headers2 = new BasicHeader("Cookie", cookieNew);

    httppost.setEntity(mpEntity);
    httppost.setHeader(headers2);
    System.out.println("executing request " + httppost.getRequestLine());
    HttpResponse responseX = httpclient.execute(httppost);
    HttpEntity resEntity = responseX.getEntity();

System.out.println(responseX.getStatusLine());
    if (resEntity != null) {
        System.out.println(EntityUtils.toString(resEntity));
    }
    if (resEntity != null) {
        resEntity.consumeContent();
    }

    httpclient.getConnectionManager().shutdown();

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您知道原因以及如何避免吗？

实体设置了两次

httppost.setEntity(new UrlEncodedFormEntity(postParameters)); //it is overwritten by next one
httppost.setEntity(mpEntity);

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具有不同的值-因此使用最后一个。您应该向多部分实体添加参数

试试这样的方法：

HttpURLConnection conn = (HttpURLConnection) new URL("http://something").openConnection();
OutputStream outputStream = conn.getOutputStream();
// Write your object to the output stream
InputStream inputStream = conn.getInputStream();

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你得到了什么样的回应？我已经更新了信息

httppost.setEntity(new UrlEncodedFormEntity(postParameters)); //it is overwritten by next one
httppost.setEntity(mpEntity);

HttpURLConnection conn = (HttpURLConnection) new URL("http://something").openConnection();
OutputStream outputStream = conn.getOutputStream();
// Write your object to the output stream
InputStream inputStream = conn.getInputStream();