通过 apache 中的 php 文件将图像上传到服务器，使用 Android 上的 HttpUrlConnection

使用这个

//File path 
String filepath = ""
@Override
protected String doInBackground(Void... params) {
    String responseString = null;
    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    DataInputStream inStream = null;
    String lineEnd = "'r'n";
    String twoHyphens = "--";
    String boundary = "*****";
    int bytesRead;
    long sentData = 0;
    //URL
    String urlString = ""
    try {
        UUID uniqueKey = UUID.randomUUID();
        String fname = uniqueKey.toString();
        FileInputStream fileInputStream = new FileInputStream(new File(filePath));
        int length = fileInputStream.available();
        URL url = new URL(urlString);
        conn = (HttpURLConnection) url.openConnection();
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.setRequestProperty("Content-Type",
                "multipart/form-data;boundary=" + boundary);
        conn.setChunkedStreamingMode(1024);
        dos = new DataOutputStream(conn.getOutputStream());
        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name='"file'"; filename='""+ (new File(filePath)).getName()+"'"" + lineEnd);
        dos.writeBytes(lineEnd);
        int maxBufferSize = 1024;
        int bufferSize = Math.min(length, maxBufferSize);
        byte[ ] buffer = new byte[bufferSize];
        bytesRead = 0;
        int latestPercentDone;
        int percentDone = -1;
        bytesRead =  fileInputStream.read(buffer, 0, bufferSize);
        while (bytesRead > 0) {
            dos.write(buffer, 0, bytesRead);
            sentData += bytesRead;
            latestPercentDone = (int) ((sentData / (float) length) * 100);
            if (percentDone != latestPercentDone) {
                percentDone = latestPercentDone;
                publishProgress(percentDone);
            }
            int bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable,maxBufferSize);
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        }
        dos.writeBytes(lineEnd);
        dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
        fileInputStream.close();
        dos.flush();
        dos.close();
    } catch (MalformedURLException ex) {
    } catch (IOException ioe) {
    }
    try {
        statusCode = conn.getResponseCode();
        if (statusCode == 200) {
            responseString = "File Uploaded";
        } else {
            responseString = "Error occurred! Http Status Code: "
                    + statusCode;
        }

    } catch (IOException ioex) {
        responseString = ioex.getMessage();
    }
    return responseString;
}
@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
    System.out.println(result)
}

另外，请尝试在上传之前将文件写入某个位置。如果上传失败并且您想稍后重试，这将非常有用。

我昨天遇到了类似的问题。我讨厌发送图像和文本。在尝试了不同的方法后，我最终使用了okhttp3：https://github.com/square/okhttp。在我看来，这是最简单的方法。

在 Android 工作室中，首先您必须将 okhttp 添加到您的项目中。在 build.gradle 文件中的依赖项下添加它：

dependencies {
    compile 'com.squareup.okhttp3:okhttp:3.2.0
}

我在安卓项目中的java文件看起来类似于以下内容。它是片段类的一部分。因此，如果您要在活动中使用它，则可以使用它更改getActivity（）以获取上下文。我将要发送的文件的路径存储在 ArrayList（变量 imageList）中。函数 backgroundThreadAlert 只是响应所必需的。如果您不需要知道上传是否成功，则可以忽略此功能。

 public class UploadClient extends AsyncTask<String, String, JSONObject> {
    private ProgressDialog progressBar;
    String status = "";
    String formname = "mytext";
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressBar = new ProgressDialog(getActivity());
        progressBar.setMessage("Send files. Please wait...");
        progressBar.setIndeterminate(false);
        progressBar.setCancelable(false);
        progressBar.show();
    }
    @Override
    protected JSONObject doInBackground(String... params) {
        try {
            int picindex = 0;
            String url = "https://<urltouploadphp>/upload.php";
            MultipartBody.Builder buildernew = new MultipartBody.Builder();
            buildernew.setType(MultipartBody.FORM);
            buildernew.addFormDataPart("formname", formname);
            for(int j = 0; j < imageList.size(); j++) {  // imageList is a ArrayList<String> of local paths of the images i want to upload
                String imagepath = imageList.get(j);
                File imgfile = new File(imagepath);
                if(imgfile.exists()) {
                    buildernew.addFormDataPart("file" + picindex, imagepath, RequestBody.create(MediaType.parse("image/*"), imgfile));
                    picindex++;
                }
            }
            MultipartBody requestBody = buildernew.build();
            Request request = new Request.Builder()
                    .url(url)
                    .post(requestBody)
                    .build();
            OkHttpClient client = new OkHttpClient();
            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException throwable) {
                    throwable.printStackTrace();
                }
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
                    try {
                        String jsonData = response.body().string();
                        JSONObject Jobject = new JSONObject(jsonData);
                        status = Jobject.getString("status");
                    } catch (JSONException e) {
                        // Error in json
                    }
                    backgroundThreadAlert(getActivity());
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(JSONObject json) {
        if (progressBar.isShowing()) {
            progressBar.dismiss();
        }
    }
    // Looper function to call from background thread "onResponse" - in this case a AlertDialog
    public void backgroundThreadAlert(final Context context) {
        if (context != null) {
            new Handler(Looper.getMainLooper()).post(new Runnable() {
                AlertDialog.Builder warnSend = new AlertDialog.Builder(getActivity());
                @Override
                public void run() {
                    if (status.equals("FAILED")) {
                        warnSend.setTitle("Upload failed");
                        warnSend.setMessage("upload to server failed");
                    } else if (status.equals("SUCCESS")) {
                        warnSend.setTitle("Upload completed");
                        warnSend.setMessage("upload completed, images sent.");
                    } else {
                        // error - no connection to server ?
                    }
                    warnSend.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                        }
                    });
                    warnSend.show();
                }
            });
        }
    }
}

用这个调用任务：

new UploadClient().execute();

我在服务器上上传.php文件看起来与此类似：

<?php
    $name = $_POST['formname'];
    for($i = 0; $i < count($_FILES); $i++) {
        $fileName   = $_FILES['file'.$i]['name'];
        $fileType   = $_FILES['file'.$i]['type'];
        $rootName = explode(".", $fileName)[0];
        $extension = explode(".", $fileName)[1];
        $newName = $rootName.".".$extension;
        $moved = move_uploaded_file($_FILES["file".$i]["tmp_name"], $newName );
        if ($moved) $path = $newName;
    }
    // JSON-Response
    $time = time();
    if ($moved) {
         $arrayToSend = array('status'=>'SUCCESS','time'=>$time, 'name'=>$name, 'countPics'=>count($_FILES));
    } else {
         $arrayToSend = array('status'=>'FAILED','time'=>$time);
    }
    header('Content-Type:application/json');
    echo json_encode($arrayToSend);
?>

希望，它有帮助。