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This article mainly introduces the relevant knowledge of "what is the method of Java NIO performance testing". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "what is the method of Java NIO performance testing" can help you solve the problem.

Time (ms)

File size (byte)

Buffer (byte)

four hundred and thirty four

603900

10000

0

0

one thousand

0

forty-six

one hundred

0

one hundred and eighty eight

fifty

0

two hundred and eighty one

five

0

2406

one

forty-seven

12000

Java Code:

Package com; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import junit.framework.TestCase / * NIO read write test * * @ author wutao * * / public class NioDemo extends TestCase {public void testRead () throws IOException {int [] sizes = {10000, 1000, 100,50,5,1}; / / Arrays.sort (sizes) System.out.println (new File ("text.txt"). Length (); for (int I = 0; I < sizes.length; iTunes +) {int size = sizes [I]; FileInputStream fins = new FileInputStream ("text.txt"); FileChannel fc = fins.getChannel () If (! new File ("text2.txt") .exists ()) {new File ("text2.txt") .createNewFile ();} ByteBuffer buffer = ByteBuffer.allocate (size); FileOutputStream fouts = new FileOutputStream ("text2.txt"); FileChannel fc2 = fouts.getChannel () Long start = System.currentTimeMillis (); while (true) {buffer.clear (); int r = fc.read (buffer); if (r =-1) {break } buffer.flip (); fc2.write (buffer);} long end = System.currentTimeMillis (); System.out.println ("-" + size + "-") System.out.println (end-start); fc.close (); fc2.close (); fins.close (); fouts.close () } Java ™I/O, 2nd Edition By Elliotte Rusty Harold... Publisher: O'Reilly Pub Date: May 2006 Print ISBN-10: 0596-52750-0 Print ISBN-13: 978-59-652750-1 Pages: 726import java.io.*; import java.nio.*; import java.nio.channels.*; public class NIOCopier {public static void main (String [] args) throws IOException {FileInputStream inFile = new FileInputStream (args [0]); FileOutputStream outFile = new FileOutputStream (args [1]) FileChannel inChannel = inFile.getChannel (); FileChannel outChannel = outFile.getChannel (); for (ByteBuffer buffer = ByteBuffer.allocate (1024); inChannel.read (buffer)! =-1; buffer.clear ()) {buffer.flip (); while (buffer.hasRemaining ()) outChannel.write (buffer);} inChannel.close () OutChannel.close ();}} this is the end of the introduction to "what is the method of Java NIO performance testing". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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