安卓客户端文件上传至服务器：简单实现(安卓file文件上传服务器)

在安卓客户端，可以使用HttpURLConnection或者第三方库如OkHttp、Retrofit等实现文件上传至服务器。

安卓客户端文件上传至服务器：简单实现

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简介

本文将介绍如何在安卓客户端上实现文件上传至服务器的功能，我们将使用Android的HttpURLConnection类来实现HTTP请求，并通过POST方法将文件上传到服务器。

准备工作

在开始之前，请确保您已经安装了Android Studio，并创建了一个新的Android项目。

步骤

1. 添加网络权限

在AndroidManifest.xml文件中添加以下权限：

2. 选择文件

我们需要让用户选择一个要上传的文件，可以使用Intent来调用系统的文件选择器。

private static final int PICK_FILE_REQUEST = 1;
private void openFileChooser() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("*/*");
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    startActivityForResult(intent, PICK_FILE_REQUEST);
}

3. 获取文件路径

当用户选择了文件后，我们需要获取文件的绝对路径，可以通过以下方法实现：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == PICK_FILE_REQUEST && resultCode == RESULT_OK) {
        Uri fileUri = data.getData();
        uploadFile(fileUri);
    }
}
private String getFilePath(Uri fileUri) {
    String[] projection = {MediaStore.Images.Media.DATA};
    Cursor cursor = getContentResolver().query(fileUri, projection, null, null, null);
    if (cursor != null) {
        int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);
        cursor.moveToFirst();
        String filePath = cursor.getString(columnIndex);
        cursor.close();
        return filePath;
    }
    return null;
}

4. 上传文件

现在我们可以编写一个方法来上传文件，这里我们使用HttpURLConnection类来实现HTTP请求。

private void uploadFile(Uri fileUri) {
    String filePath = getFilePath(fileUri);
    if (filePath != null) {
        File file = new File(filePath);
        String boundary = "*****";
        String lineEnd = "\r
";
        String twoHyphens = "--";
        String serverUrl = "https://example.com/upload"; // 替换为你的服务器地址
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(serverUrl).openConnection();
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
            outputStream.writeBytes(twoHyphens + boundary + lineEnd);
            outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + file.getName() + "\"" + lineEnd);
            outputStream.writeBytes(lineEnd);
            FileInputStream fileInputStream = new FileInputStream(file);
            int bytesAvailable = fileInputStream.available();
            int bufferSize = Math.min(bytesAvailable, 1024);
            byte[] buffer = new byte[bufferSize];
            int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            while (bytesRead > 0) {
                outputStream.write(buffer, 0, bufferSize);
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, 1024);
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            }
            outputStream.writeBytes(lineEnd);
            outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
            outputStream.flush();
            outputStream.close();
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                reader.close();
                inputStream.close();
                Log.d("Upload", "Response: " + response.toString());
            } else {
                Log.e("Upload", "Error: " + responseCode);
            }
        } catch (Exception e) {
            Log.e("Upload", "Error: " + e.getMessage());
        }
    }
}