Java之nio性能比较

结果:
used time:53574684
used time:1800077620
used time:12563690
可见MappedByteBuffer读写数据是最快的, 其次是FileChannel, 再其次就是RandomAccessFile.
public class BufferedCache {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
test3();
test2();
test1();
}

public static void test1() throws IOException {
long start = System.nanoTime();
FileChannel fc = new RandomAccessFile("/tmp/test.tmp", "rw").getChannel();
MappedByteBuffer mbb = fc.map(MapMode.READ_WRITE, 0, 8);

for (int i = 0; i < 100000; i++) {
mbb.putLong(0, i);
}
long end = System.nanoTime();
System.out.println("used time:" + (end - start));
fc.close();

}

public static void test2() throws IOException {
long start = System.nanoTime();
RandomAccessFile raf = new RandomAccessFile("/tmp/test.tmp", "rw");
for (int i = 0; i < 100000; i++) {
raf.seek(0);
raf.writeLong(i);
}
long end = System.nanoTime();
System.out.println("used time:" + (end - start));
raf.close();
}

public static void test3() throws IOException {
long start = System.nanoTime();
FileChannel fc = new RandomAccessFile("/tmp/test.tmp", "rw").getChannel();
ByteBuffer buf = ByteBuffer.allocate(8);
for (int i = 0; i < 100000; i++) {
buf.putLong(0, i);
fc.write(buf, 0);
}
long end = System.nanoTime();
System.out.println("used time:" + (end - start));
fc.close();

}
}

巴特西

Java之nio性能比较

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