Just give the reference code and change the reading part to mine:

Public static void main(String[] args) {

File io _ Fil = new File(" E:\ \ Java \ \ study \ \ src \ \ io _ File . txt ")；

Try {

file inputstream file inputstream = new file inputstream(io _ Fil)；

Try {

byte b[]= new byte[(int)io _ fil . length()]； //The array size is determined by the file.

int len = file inputstream . read(b)； //Reading content

system . out . println(" content:"+new String(b))；

file inputstream . close()；

} catch (IOException e) {

e . printstacktrace()；

}

} catch(file not found exception e){

e . printstacktrace()；

}

}

}