如何在android studio中将pdf文件发送到服务器

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
startActivityForResult(intent, PICK_PDF_REQUEST);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_PDF_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
        Uri uri = data.getData();
        String filePath = getFilePathFromUri(uri);
        // 在这里执行上传操作
    }
}

private String getFilePathFromUri(Uri uri) {
    String filePath = "";
    Cursor cursor = getContentResolver().query(uri, null, null, null, null);
    if (cursor != null && cursor.moveToFirst()) {
        int index = cursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
        filePath = cursor.getString(index);
        cursor.close();
    }
    return filePath;
}

File file = new File(filePath);

OkHttpClient client = new OkHttpClient();

RequestBody requestBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("pdf", file.getName(), RequestBody.create(MediaType.parse("application/pdf"), file))
        .build();

Request request = new Request.Builder()
        .url("YOUR_SERVER_URL")
        .post(requestBody)
        .build();

try {
    Response response = client.newCall(request).execute();
    // 处理服务器响应
} catch (IOException e) {
    e.printStackTrace();
}