Java FileNotFoundException打开失败：eNot（没有这样的文件或目录）

我有一个名为“and.doc”的文件，它有大量的记录，每个记录都有这种形状

表达：防御

所以我想

• 用扫描仪读取文件
• 使用

  作为分隔符

• 找到从定义中拆分表达式的方法
• 并以某种方式将它们添加到我的Sqlite数据库中（如果有人知道如何做到这一点，那就太好了）

我正在使用这个代码

    try {


  mf =new File("/home/agh/AndroidStudioProjects/Dicod/app/src/main/res/raw/and.doc");
        inputFile = new Scanner(mf);
        inputFile.useDelimiter(";");
        while (inputFile.hasNext())
        {
            String x = inputFile.next();
            Toast.makeText(getApplicationContext(),x,Toast.LENGTH_LONG).show();

       //Splitting and adding to the databse

        }


    }

    catch(FileNotFoundException e) {
        e.printStackTrace();
    }`

但我总是犯这个错误

06-23 04:38:28.771 23620-23620/? W/System.err: java.io.FileNotFoundException: /home/agh/AndroidStudioProjects/Dicod/app/src/main/res/raw/and.txt: open failed: ENOENT (No such file or directory)
06-23 04:38:28.771 23620-23620/? W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:465)
06-23 04:38:28.771 23620-23620/? W/System.err:     at java.io.FileInputStream.<init>(FileInputStream.java:76)
06-23 04:38:28.771 23620-23620/? W/System.err:     at java.util.Scanner.<init>(Scanner.java:158)
06-23 04:38:28.772 23620-23620/? W/System.err:     at java.util.Scanner.<init>(Scanner.java:138)
06-23 04:38:28.772 23620-23620/? W/System.err:     at com.example.agh.dicod.MainActivity.onCreate(MainActivity.java:28)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.Activity.performCreate(Activity.java:5990)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.ActivityThread.access$800(ActivityThread.java:156)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.os.Looper.loop(Looper.java:211)
06-23 04:38:28.772 23620-23620/? W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5389)
06-23 04:38:28.772 23620-23620/? W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
06-23 04:38:28.772 23620-23620/? W/System.err:     at java.lang.reflect.Method.invoke(Method.java:372)
06-23 04:38:28.772 23620-23620/? W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
06-23 04:38:28.772 23620-23620/? W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
06-23 04:38:28.772 23620-23620/? W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
06-23 04:38:28.773 23620-23620/? W/System.err:     at libcore.io.Posix.open(Native Method)
06-23 04:38:28.773 23620-23620/? W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
06-23 04:38:28.773 23620-23620/? W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:451)
06-23 04:38:28.773 23620-23620/? W/System.err:  ... 17 more

06-2304:38:28.77123620-23620/？W/System.err:java.io.FileNotFoundException:/home/agh/AndroidStudioProjects/Dicod/app/src/main/res/raw/and.txt:open failed:enoint（没有这样的文件或目录）
06-23 04:38:28.771 23620-23620/? W/System.err:at libcore.io.IoBridge.open（IoBridge.java:465）
06-23 04:38:28.771 23620-23620/? W/System.err:at java.io.FileInputStream。（FileInputStream.java:76）
06-23 04:38:28.771 23620-23620/? W/System.err:at java.util.Scanner.（Scanner.java:158）
06-23 04:38:28.772 23620-23620/? W/System.err:at java.util.Scanner.（Scanner.java:138）
06-23 04:38:28.772 23620-23620/? W/System.err:at com.example.agh.dicod.MainActivity.onCreate（MainActivity.java:28）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.Activity.performCreate（Activity.java:5990）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1106）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2332）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2442）
06-23 04:38:28.772 23620-23620/? W/System.err:android.app.ActivityThread.access$800（ActivityThread.java:156）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.ActivityThread$H.handleMessage（ActivityThread.java:1351）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.os.Handler.dispatchMessage（Handler.java:102）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.os.Looper.loop（Looper.java:211）
06-23 04:38:28.772 23620-23620/? W/System.err:at-android.app.ActivityThread.main（ActivityThread.java:5389）
06-23 04:38:28.772 23620-23620/? W/System.err:at java.lang.reflect.Method.invoke（本机方法）
06-23 04:38:28.772 23620-23620/? W/System.err:at java.lang.reflect.Method.invoke（Method.java:372）
06-23 04:38:28.772 23620-23620/? W/System.err:com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1020）
06-23 04:38:28.772 23620-23620/? W/System.err:com.android.internal.os.ZygoteInit.main（ZygoteInit.java:815）
06-23 04:38:28.772 23620-23620/? W/System.err:原因：android.System.ErrnoException:打开失败：enoint（没有这样的文件或目录）
06-23 04:38:28.773 23620-23620/? W/System.err:at libcore.io.Posix.open（本机方法）
06-23 04:38:28.773 23620-23620/? W/System.err:at libcore.io.BlockGuardOs.open（BlockGuardOs.java:186）
06-23 04:38:28.773 23620-23620/? W/System.err:at libcore.io.IoBridge.open（IoBridge.java:451）
06-23 04:38:28.773 23620-23620/? W/System.err:。。。还有17个

可能文件不在所选目录中，或者未授予读取外部存储权限

请注意，如果以API 23为目标，则必须在运行时请求权限，而不仅仅是在清单中

---

该文件不存在。使用

file（）

类创建文件并将流写入其中。然后从中读取数据。尝试将权限添加到Manifest.xml，然后重试

<manifest ...>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
                     />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
                         />
    ...
</manifest>

...

@Abdul2511

我不确定我是否理解写流部分

我认为他的意思是，尽管下面的代码将读取目录中的文本文件内容 作为参数传递的文件myfile应该是提取的目录

// getdata() is the method which reads the data
    // the data that is saved in byte format in the file
    private String getdata(File myfile) {
        FileInputStream fileInputStream = null;
        try {
            Log.i("file_read_send_to_getData_function",myfile.toString());
            fileInputStream = new FileInputStream(myfile);
            int i = -1;
            StringBuffer buffer = new StringBuffer();
            while ((i = fileInputStream.read()) != -1) {
                buffer.append((char) i);
            }
            return buffer.toString();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

---

我想你要通过的目录

"/home/agh/AndroidStudioProjects/Dicod/app/src/main/res/raw/and.doc"

存在于您的计算机上，但该文件需要来自您的android设备或android emulator的目录，这就是它引发异常的原因

如果您的“and.doc”存在于android设备的共享外部存储“/storage/emulated/0/Documents/”中，那么只要您正确提取目录，我认为该文件将能够访问它

以下是如何获取sd卡中的文档文件夹目录的示例

File externalStorageDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS); //getting external storage directory
                    //it's another method to get the directory of a file inside the external storage of a device
                    File folder = new File(externalStorageDirectory + "/Password");

---

替换为“/Password”，将其替换为您的文件夹名

@Abdul2511

，并以某种方式将其添加到我的Sqlite数据库中

下面是一个示例代码，您可以使用它作为参考，了解如何在android设备中保存和检索sqlLITE数据库中的数据 我们的SQLite数据库的根类是SQLiteOpenHelper 扩展SQLiteOpenHelper将把SQLite数据库的根类导入到我们的数据库类中

    //root class of our SQLite database is SQLiteOpenHelper
//extends SQLiteOpenHelper will import that root class of SQLite databse into our NoteDatabase class
public class NoteDatabase extends SQLiteOpenHelper {

private static final int DATABASEVERSION= 2;
private static final String DATABASE_NAME = "your database name";
private static final String DATABASE_TABLE = "your table name";

//column names for database
private static final String KEY_ID="id";
private static final String KEY_TITLE="expression";
private static final String KEY_CONTENT="defenition";
private static final String KEY_DATE="date";
private static final String KEY_TIME="time";

public static List<Note> allNotes;

//creating a constructor for our noteDatabase
NoteDatabase(Context context){
    super(context,DATABASE_NAME,null,DATABASEVERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
    //onCreate is called everytime the noteDatabase instance is created inside any class of this application
    //creating the database table
    String query = "CREATE TABLE " + DATABASE_TABLE +" ("+ KEY_ID +" INTEGER PRIMARY KEY AUTOINCREMENT , "+
            KEY_TITLE+" TEXT, "+
            KEY_CONTENT+" TEXT, "+
            KEY_DATE+" TEXT, "+
            KEY_TIME+" TEXT "+")";
    db.execSQL(query);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 //checking for updates for our database
    if(oldVersion>=newVersion){
        return;
    }
    else{
        //update the table if new version is available
        db.execSQL("DROP TABLE IF EXISTS "+DATABASE_TABLE);
        onCreate(db);
    }
}

//it will take Note as a parameter this note will contain all the information like title, content , date and time
//and it will send that note from addnote activity to this node database
//Note note is the class that we just created
public long addnote(Note note){
   //here we will insert the data
    SQLiteDatabase db = this.getWritableDatabase();
    //this contentValues will create a dictionary like structure
    ContentValues contentValues = new ContentValues();
    //now we can save our value to the keys that we have created in this class
   // contentValues.put(KEY_ID,note.getID()); ***Do not insert Id inside SQLite instead auto increament the id to be unique
    contentValues.put(KEY_TITLE,note.getTitle());
    contentValues.put(KEY_CONTENT,note.getContent());
    contentValues.put(KEY_TIME,note.getTime());
    contentValues.put(KEY_DATE,note.getDate());

    //now we will insert the data
    //if the data is inserted successfully it will return the long value of the primary key
    long ID = db.insert(DATABASE_TABLE,null,contentValues);
    db.close();
    Log.i("ID", Long.toString(ID));
    return ID;
}
//this will get all the notes present in the database
//so that we can desplay it in our ListView
public List<Note> getNotes(){
    //we will pull the data from the database using element's unique id
    //select * from databse where id = whatever the id we have passed on here
    //* means acessing all the data in that particular id elements
    //creating an instance of our database
    SQLiteDatabase db = this.getReadableDatabase();
    //creating a list of generic type called Note
    allNotes = new ArrayList<>();
    String query = "SELECT * FROM "+DATABASE_TABLE;
    Cursor cursor = db.rawQuery(query,null);
    if(cursor.moveToFirst()){
        //i am going to pull all the data from the database and pass that data onto our listView
        do{

            //now creating a new note and save the data from the database by using cursor
            Note note = new Note();
            note.setID(cursor.getLong(0));
            note.setTitle(cursor.getString(1));
            note.setContent(cursor.getString(2));
            note.setDate(cursor.getString(3));
            note.setTime(cursor.getString(4));

            //adding this to lisView
            allNotes.add(note);

        }while(cursor.moveToNext());
    }
    return allNotes;
}

//updating the database
//replacing the old data with the updated data set inside the database
public int editNote(Note note){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(KEY_TITLE,note.getTitle());
    contentValues.put(KEY_CONTENT,note.getContent());
    contentValues.put(KEY_DATE,note.getDate());
    contentValues.put(KEY_TIME,note.getTime());
    return db.update(DATABASE_TABLE, contentValues,KEY_ID+"=?",new String[]{String.valueOf(note.getID())});
}

//the method will handel the deletion of the notes
//this method will be called from the noteDetails.class
void deleteNote(long id){
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(DATABASE_TABLE,KEY_ID+"=?",new String[]{String.valueOf(id)});
    db.close();
}

}

//我们的SQLite数据库的根类是SQLiteOpenHelper
//扩展SQLiteOpenHelper将把SQLite数据库的根类导入我们的NoteDatabase类
公共类NoteDatabase扩展了SQLiteOpenHelper{
私有静态最终int数据库版本=2；
私有静态最终字符串数据库\u NAME=“您的数据库名称”；
私有静态最终字符串数据库\u TABLE=“您的表名”；
//数据库的列名
私有静态最终字符串密钥\u ID=“ID”；
私有静态最终字符串键\u TITLE=“expression”；
私有静态最终字符串键\u CONTENT=“defentition”；
私有静态最终字符串键\u DATE=“DATE”；
私有静态最终字符串键\u TIME=“TIME”；
公共静态列表所有注释；
//为我们的Notes数据库创建构造函数
NoteDatabase（上下文）{
super（上下文、数据库名称、null、数据库版本）；
}
@凌驾
public void onCreate（SQLiteDatabase db）{
//每次在该应用程序的任何类中创建noteDatabase实例时，都会调用onCreate
//创建dat