Java输入输出流复制文件所用时间对比

2020-06-03 11:17scx_white JAVA教程

这篇文章主要介绍了Java输入输出流复制文件所用时间对比的相关资料,非常不错，具有参考解决价值，需要的朋友可以参考下

废话不多说，关键代码如下所述：

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									package com.edu.xynu; 

									import java.io.BufferedInputStream; 

									import java.io.BufferedOutputStream; 

									import java.io.File; 

									import java.io.FileInputStream; 

									import java.io.FileOutputStream; 

									import java.io.IOException; 

									public class IOUnitCopy { 

									//按字节 

									public static void copyByByte(File srcFile,File destFile) throws IOException{ 

									FileInputStream fis=new FileInputStream(srcFile); 

									FileOutputStream fos=new FileOutputStream(destFile); 

									int i; 

									while((i=fis.read())!=-1){ 

									fos.write(i); 

									} 

									fis.close(); 

									fos.close(); 

									} 

									//按字节数组 

									public static void copyByByteArray(File srcFile,File destFile) throws IOException{ 

									FileInputStream fis=new FileInputStream(srcFile); 

									FileOutputStream fos=new FileOutputStream(destFile); 

									byte []buf=new byte[10*1024]; 

									int i; 

									while((i=fis.read(buf, 0, buf.length))!=-1){ 

									fos.write(buf, 0, i); 

									} 

									fis.close(); 

									fos.close(); 

									} 

									//字节缓冲流 

									public static void copyByBuff(File srcFile,File destFile) throws IOException{ 

									BufferedInputStream bis=new BufferedInputStream(new FileInputStream(srcFile)); 

									BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(destFile)); 

									int i; 

									while((i=bis.read())!=-1){ 

									bos.write(i); 

									} 

									bos.flush(); 

									bis.close(); 

									bos.close(); 

									} 

									//字节数组批量读取 缓冲输出流写入 

									public static void copyByBuffArray(File srcFile,File destFile) throws IOException{ 

									FileInputStream bis=new FileInputStream(srcFile); 

									BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(destFile)); 

									byte [] buf=new byte[10*1024]; 

									int len; 

									while((len=bis.read(buf,0,buf.length))!=-1){ 

									bos.write(buf,0,len); 

									} 

									bos.flush(); 

									bis.close(); 

									bos.close(); 

									} 

									} 

									package com.edu.xynu; 

									import java.io.File; 

									import java.io.IOException; 

									public class IOUnitsCopyTest { 

									public static void main(String[] args) { 

									// TODO Auto-generated method stub 

									try { 

									long start=System.currentTimeMillis(); 

									// IOUnitCopy.copyByByte(new File("c:\\1.mp3"), new File( 

									// "c:\\2.mp3"));//90713ms 

									// IOUnitCopy.copyByByteArray(new File("c:\\1.mp3"), new File( 

									// "c:\\3.mp3"));//41ms 

									// IOUnitCopy.copyByBuff(new File("c:\\1.mp3"), new File( 

									// "c:\\4.mp3"));//556ms 

									// IOUnitCopy.copyByByteArray(new File("c:\\1.mp3"), new File( 

									// "c:\\5.mp3"));//30ms 

									long end=System.currentTimeMillis(); 

									System.out.println(end-start); 

									} catch (IOException e) { 

									// TODO Auto-generated catch block 

									e.printStackTrace(); 

									} 

									} 

									}