Fully understand Java byte array and file read/write _java

fully understand Java byte arrays and file reads and writes

Import Java.io.ByteArrayOutputStream;
Import Java.io.File;
Import Java.io.FileInputStream;
Import Java.io.FileOutputStream;

Import java.io.IOException; public class Filehelper {<span style= "White-space:pre" > </span>//the first way to get the contents of a file public byte[] GetContent (stri

    Ng FilePath) throws IOException {File File = new file (FilePath);
    Long fileSize = File.length ();
      if (FileSize > Integer.max_value) {System.out.println ("file Too big ...");
    return null;

    FileInputStream fi = new FileInputStream (file);

    byte[] buffer = new byte[(int) fileSize];

    int offset = 0;

    int numread = 0;

      while (Offset < buffer.length && (Numread = fi.read (buffer, offset, buffer.length-offset)) >= 0) {

    Offset + + Numread;
          //Ensure that all data is read if (offset!= buffer.length) {throw new IOException ("Could not completely read file"

    + File.getname ());

    } fi.close ();
  return buffer; }//SecondType get file content way public byte[] GetContent2 (String filePath) throws IOException {FileInputStream in=new fileinputstream (f
    
    Ilepath);
    
    Bytearrayoutputstream out=new Bytearrayoutputstream (1024);
    
    System.out.println ("bytes available:" +in.available ());
    
    Byte[] Temp=new byte[1024];
    
    int size=0;
    while ((Size=in.read (temp))!=-1) {out.write (temp,0,size);
    
    } in.close ();
    Byte[] Bytes=out.tobytearray ();
    
    System.out.println ("bytes size got is:" +bytes.length);
  return bytes;  ///write byte array to file public void CreateFile (String path, byte[] content) throws IOException {FileOutputStream Fos =

    New FileOutputStream (path);
    Fos.write (content);
  Fos.close ();
 }

}

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