What is the reason my byte array is full of zeros after converting a file which have text init? [duplicate]

Question

I am trying read a text file and insert those content into database. My file.length() is 3540 But the byte array is full of zeros. As a result when I open the text file, it is empty.

File file = new File("/temp/abc.txt");
byte[] bytesArray = new byte[(int) file.length()]; 
databaseBean.setContentInByteArray(bytesArray);

Here the byteArray is full of zeroes.

The short answer is that your code is not opening and reading the file. See the linked Q&A for ways to read a file into a byte array. — Stephen C
– Stephen C, Commented Jul 2, 2019 at 13:42

Joop Eggen · Accepted Answer · 2019-07-02 12:52:24Z

0

Path file = Paths.get("/temp/abc.txt");
byte[] bytesArray = Files.readAllBytes(path); 
databaseBean.setContentInByteArray(bytesArray);

A File is just a holder for a physical file on disk, a path, not its content.

new byte[42] will create a zeroed array of 42 bytes.

You would have to read those bytes. Path is a newer, more general class i.o. File and I used the Files class to read all those bytes.

answered Jul 2, 2019 at 12:52

Joop Eggen

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