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August 3, 2015 02:15
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测试io与nio性能
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| package visu.platform.analyzer; | |
| import java.io.*; | |
| import java.nio.ByteBuffer; | |
| import java.nio.channels.FileChannel; | |
| /** | |
| * <p>类说明:</p> | |
| * | |
| * @version 1.0 | |
| * <p>文件名：Iotest</p> | |
| * <p>创建人及时间： suntiancheng 2015/8/2</p> | |
| * <p/> | |
| * <p>修改人：</p> | |
| * <p>修改时间：</p> | |
| * <p>修改描述：</p> | |
| */ | |
| public class IoTest { | |
| /** 186M文件 | |
| * 采用传统IO InputStream 读取，耗时：442 | |
| 采用传统IO BufferedInputStream 读取，耗时：584 | |
| 采用传统IO RandomAccessFile 读取，耗时：745 | |
| 采用NIO FileChannel 自带方法 读取，耗时：387 | |
| 采用NIO FileChannel 循环 读取，耗时：479 | |
| * @param args | |
| * @throws IOException | |
| */ | |
| public static void main(String[] args) throws IOException { | |
| File file = new File("H:\\visu20150515.zip"); | |
| File file1 = new File("H:\\visu20150516.zip"); | |
| System.out.println(file.getTotalSpace()); | |
| copyFile(file, file1); | |
| file1.delete(); | |
| copyFile1(file, file1); | |
| file1.delete(); | |
| copyFile3(file, file1); | |
| file1.delete(); | |
| copyFile4(file, file1); | |
| file1.delete(); | |
| copyFile5(file, file1); | |
| } | |
| public static void copyFile(final File from, final File to) throws IOException { | |
| long beginTime = System.currentTimeMillis(); | |
| final InputStream is = new FileInputStream(from); | |
| final OutputStream os = new FileOutputStream(to); | |
| final byte[] buf = new byte[8192]; | |
| int read = 0; | |
| while ((read = is.read(buf)) != -1) { | |
| os.write(buf, 0, read); | |
| } | |
| os.flush(); | |
| os.close(); | |
| is.close(); | |
| System.out.println("采用传统IO InputStream 读取，耗时：" + (System.currentTimeMillis() - beginTime)); | |
| } | |
| public static void copyFile1(final File from, final File to) throws IOException { | |
| long beginTime = System.currentTimeMillis(); | |
| FileInputStream fis = new FileInputStream(from); | |
| FileOutputStream fos = new FileOutputStream(to); | |
| BufferedInputStream bis = new BufferedInputStream(fis); | |
| BufferedOutputStream bos = new BufferedOutputStream(fos); | |
| byte[] b = new byte[8192]; | |
| int len = 0; | |
| while ((len = bis.read(b)) != -1) { | |
| bos.write(b, 0, len); | |
| } | |
| bos.flush(); | |
| fis.close(); | |
| fos.close(); | |
| bis.close(); | |
| bos.close(); | |
| System.out.println("采用传统IO BufferedInputStream 读取，耗时：" + (System.currentTimeMillis() - beginTime)); | |
| } | |
| public static void copyFile3(final File from, final File to) throws IOException { | |
| long beginTime = System.currentTimeMillis(); | |
| FileInputStream fis = new FileInputStream(from); | |
| RandomAccessFile raf = new RandomAccessFile(to, "rw"); | |
| byte[] b = new byte[8192]; | |
| int len = 0; | |
| while ((len = fis.read(b)) != -1) { | |
| raf.write(b, 0, len); | |
| } | |
| raf.close(); | |
| fis.close(); | |
| System.out.println("采用传统IO RandomAccessFile 读取，耗时：" + (System.currentTimeMillis() - beginTime)); | |
| } | |
| public static void copyFile4(final File from, final File to) throws IOException { | |
| long beginTime = System.currentTimeMillis(); | |
| FileChannel fc = new FileInputStream(from).getChannel(); | |
| FileChannel fco = new FileOutputStream(to) | |
| .getChannel(); | |
| fco.transferFrom(fc, 0, fc.size()); | |
| fco.close(); | |
| fc.close(); | |
| System.out.println("采用NIO FileChannel 自带方法 读取，耗时：" + (System.currentTimeMillis() - beginTime)); | |
| } | |
| public static void copyFile5(final File from, final File to) throws IOException { | |
| long beginTime = System.currentTimeMillis(); | |
| FileChannel fc = new FileInputStream(from).getChannel(); | |
| FileChannel fco = new FileOutputStream(to).getChannel(); | |
| ByteBuffer buf = ByteBuffer.allocate(8192); | |
| while (fc.read(buf) != -1) { | |
| buf.flip(); | |
| fco.write(buf); | |
| buf.clear(); | |
| } | |
| System.out.println("采用NIO FileChannel 循环 读取，耗时：" + (System.currentTimeMillis() - beginTime)); | |
| } | |
| } |
Author
Author
5.39 GB
采用传统IO InputStream 读取，耗时：53357
采用传统IO BufferedInputStream 读取，耗时：51795
采用传统IO RandomAccessFile 读取，耗时：51041
采用NIO FileChannel 自带方法 读取，耗时：51221
采用NIO FileChannel 循环 读取，耗时：56318
Author
186M
采用传统IO InputStream 读取，耗时：442
采用传统IO BufferedInputStream 读取，耗时：584
采用传统IO RandomAccessFile 读取，耗时：745
采用NIO FileChannel 自带方法 读取，耗时：387
采用NIO FileChannel 循环 读取，耗时：479
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1GB
采用传统IO InputStream 读取，耗时：10694
采用传统IO BufferedInputStream 读取，耗时：9426
采用传统IO RandomAccessFile 读取，耗时：9223
采用NIO FileChannel 自带方法 读取，耗时：9764
采用NIO FileChannel 循环 读取，耗时：9213