java-reading data from a file

1, FileInputStream ()

              //constructs a byte input stream object with the parameter file nameFileInputStream fin =NewFileInputStream ("Message"); System.out.println ("Input stream can be read in bytes:" +fin.available ()); //set up byte array B, the data read from the input stream is temporarily stored in B              byteB[] =New byte[Fin.available ()]; //reading data from an input streamFin.read (b); String STR5=NewString (b);              System.out.println (STR5); //close the input stream, the operation of the file, be sure to close the input and output stream at the endFin.close ();

2, Randomaccessfile ()

              String str6= "";              ArrayList<String> strs=new arraylist<string>();              Randomaccessfile file=new randomaccessfile ("message", "R");               = file.readline ();                while (str6!=null) {                  strs.add (STR6);                   = file.readline ();              }                for (int j=0;j<strs.size (); j + +) {                  System.out.println (Strs.get (j));              }              File.close ();

3. File

              File file2=New file ("message");              if (file2.exists () &&file2.isfile ()) {                  InputStream is=newbyte while(Is.read (buf)! = -1// per read print System.out.println (new String (BUF));}}         

4. Avoid garbled characters

File File3 =New File ("message");if (file3.exists () &&File3.isfile ()) {Try {InputStream is = newnew InputStreamReader (IS, "utf-8");  char[] cbuf = new char [Is.available ()]; // StringBuffer Sb2=new stringbuffer () 2 while (Reader.read (cbuf)! = -1) {Sb2.append (CBUF);} System.out.println (Sb2.tostring ()); } catch (Exception e) {}}     /span>             

5, BufferedReader

File File =NewFile ("Message"); Try{InputStream is=Newfileinputstream (file); if(File.exists () &&File.isfile ()) {BufferedReader br=NewBufferedReader (NewInputStreamReader (IS, "Utf-8")); StringBuffer SB2=NewStringBuffer (); String Line=NULL;  while(line = Br.readline ())! =NULL) {sb2.append ( line+ "\ n");                    } br.close ();                System.out.println (Sb2.tostring ()); }            } Catch(Exception e) {}

java-reading data from a file