Java read files are buffered using Mappedbytebuffer

Java read files are buffered using Mappedbytebuffer, which ensures that the side reads large files and handles them.

Package Sean;import Java.io.bytearrayinputstream;import Java.io.file;import java.io.randomaccessfile;import Java.nio.mappedbytebuffer;import Java.nio.channels.filechannel;import Java.util.scanner;public class Snippet { public void Readresource () {Long filelength = 0;final int buffer_size = 0x300000;//3M buffer//for (String Filedirectory:thi S.readresourcedirectory ())//Get the file storage path, I use a method here to read out the file//storage path from the XML file, of course, you can also use the absolute path to replace the Filedriectory//{file file = new File ("D:\\mydata.txt"); filelength = File.length (); try {mappedbytebuffer inputbuffer = new Randomaccessfile (file, "R"). Getchannel (). Map (FileChannel.MapMode.READ_ONLY, 0,filelength);//Read large file byte[] dst = new byte[buffer_size];// Read the contents of 3M each time for (int offset = 0; offset < filelength; offset + = Buffer_size) {if (Filelength-offset >= buffer_size) { for (int i = 0; i < buffer_size; i++) Dst[i] = Inputbuffer.get (offset + i);} else {for (int i = 0; i < Filelength-offset; i++) Dst[i] = Inputbuffer.get (offset + i);} Will get the 3M content to scanner, here's XXX refers to the Scanner parsed delimiter Scanner scan = new Scanner (new Bytearrayinputstream (DST)). Usedelimiter (""); while (Scan.hasnext ()) {// Here is the method for parsing the read text System.out.print (Scan.next () + "");} Scan.close ();}} catch (Exception e) {e.printstacktrace ();} }}public static void Main (string[] args) {Snippet sp = new Snippet (); Sp.readresource ();}}

Java read files are buffered using Mappedbytebuffer