Java 如何在创建的目录中下载文件

我已经在我的android设备中使用以下工具创建了一个目录或路径：

File dlFile = new File(Environment.getExternalStorageDirectory()
                + "/RAS/download/files");

我从服务器上下载了一个文件：

Uri uri = Uri.parse("http://IPADDRESS/RAS/phpword/outputs/template.docx");
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(uri);

如何将下载的文件放入我创建的目录或路径？

试试这个

    DownloadManager.Request request = new DownloadManager.Request(
            downloadUri);

    request.setAllowedNetworkTypes(
            DownloadManager.Request.NETWORK_WIFI
                    | DownloadManager.Request.NETWORK_MOBILE)
            .setAllowedOverRoaming(false).setTitle("Data")
            .setDescription("Downloading")
            .setDestinationInExternalPublicDir("/RAS/download/files", "test.docx");

    mgr.enqueue(request);

这是您提供路径的行

setDestinationInExternalPublicDir("/RAS/download/files", "test.docx");

---

首先，您必须确保在

AndroidManifest.xml

文件中具有以下权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

获得这样的权限结果

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case REQUEST: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    downloadFile();
            } else {
                Toast.makeText(mContext, "The app was not allowed to write in your storage", Toast.LENGTH_LONG).show();
            }
        }
    }
}

然后你可以尝试下面的方法

private void downloadFile(){
   Uri uri= Uri.parse("http://IPADDRESS/RAS/phpword/outputs/template.docx");

   // Create request for android download manager
   DownloadManager downloadManager = (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
   DownloadManager.Request request = new DownloadManager.Request(uri); 
   request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);

   // set title and description
   request.setTitle("Downloading");
   request.setDescription("File download using DownloadManager.");

   request.allowScanningByMediaScanner();

   request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

   //set the local destination for download file to a path within the application's external files directory
   request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"template.docx"); // here file will be download in download directory as template.docs, you can change the directory and file name as you want.
   request.setMimeType("*/*");
   downloadManager.enqueue(request);
}

private void downloadFile(){
   Uri uri= Uri.parse("http://IPADDRESS/RAS/phpword/outputs/template.docx");

   // Create request for android download manager
   DownloadManager downloadManager = (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
   DownloadManager.Request request = new DownloadManager.Request(uri); 
   request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);

   // set title and description
   request.setTitle("Downloading");
   request.setDescription("File download using DownloadManager.");

   request.allowScanningByMediaScanner();

   request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

   //set the local destination for download file to a path within the application's external files directory
   request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"template.docx"); // here file will be download in download directory as template.docs, you can change the directory and file name as you want.
   request.setMimeType("*/*");
   downloadManager.enqueue(request);
}