Question

我有下一个问题......我在源头搜索了答案，但没有找到一个好的答案......

java.io.FileNotFoundException: /mounted/EmailClient/side-corner.png: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:453)
at java.io.FileOutputStream.<init>(FileOutputStream.
at java.io.FileOutputStream.<init>(FileOutputStream.java:73) etc

代码：

private static String saveFile(String filename, InputStream input) {
    String path = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(path)) {
        try {
            byte[] attachment = new byte[input.available()];
            input.read(attachment);
            File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/EmailClient/", filename);
            if (!file.mkdirs())
                Log.d("EmailClient", "saveFile: Dir not created");
            FileOutputStream out = new FileOutputStream(file); //PROBLEM!
            out.write(attachment);
            input.close();
            out.close();
            return path;
        } catch (IOException e) {
            Log.e("EmailClient", "saveFile: File not saved", e);;
        }
    }
    return path;
}

Answer 1

使用此代码

File folder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/EmailClient/");

folder.mkdirs();
File file = new File(folder,filename);
file.createNewFile();

Answer 2

我认为您正在尝试将文件保存在＆＃34; DIRECTORY_DOWNLOADS＆＃34;目录，。所以你应该按照下面的代码。下面的行给出了目录。

   path = Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_DOWNLOADS);

如果您想创建特定文件夹＆＃34; Email_Client＆＃34;在该路径内，写下这一行。

   File folder = new File(Environment.getExternalStoragePublicDirectory(
   Environment.DIRECTORY_DOWNLOADS)+"/Email_Client/");

你应该宣布许可＆＃34; WRITE_EXTERNAL_STORAGE＆＃34;

String fileName="myfile.txt";
            String input="Hello World";
            String path = Environment.getExternalStorageState();
            File file=null;
            if (Environment.MEDIA_MOUNTED.equals(path)) {
                try {
                    byte[] attachment = input.getBytes();

      File folder = new File(Environment.getExternalStoragePublicDirectory(
       Environment.DIRECTORY_DOWNLOADS)+"/Email_Client/");
       folder.mkdirs();


                         file=new File(folder,fileName);
          //Automatically creates the new empty file specified by the name,   if it is not exist.
                         file.createNewFile();
                        Log.i("EmailClient", "saveFile: Dir created");
                    FileOutputStream out = new FileOutputStream(file); 
                    out.write(attachment);

                    out.close();


                } catch (IOException e) {
                    Log.e("EmailClient", "saveFile: File not saved", e);;
                }
            }

请参阅此网址： https://developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory(java.lang.String)

Answer 3

如果您正在构建目标版本 API 级别高于 27 的应用，则默认情况下禁用存储访问。如果您想快速启用它，请在您的 AndroidManifest.xml 文件中添加以下行。

<manifest ... >
  <application 
       android:requestLegacyExternalStorage="true"   //add this line 
       ... >
    ...
  </application>
</manifest>

在Android中保存文件：java.io.FileNotFoundException。打开失败：ENOENT（没有这样的文件或目录）

3 个答案: