第四周JAVA学习笔记(四)
使用BufferedInputStream和BufferedOutputStream来减少复制音频文件的时间,运行效果:
![](https://images2015.cnblogs.com/blog/903690/201604/903690-20160407184210640-706072010.png)
![](https://images2015.cnblogs.com/blog/903690/201604/903690-20160407184222625-1931652042.png)
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.junit.Test; public class CopyFile { @Test public void testCopyFile(){ long start = System.currentTimeMillis(); String src="C:\\Users\\think\\Desktop\\Java作业4\\a.mp3"; String dest="C:\\Users\\think\\Desktop\\Java作业4\\b.mp3"; CopyFile(src,dest); long end = System.currentTimeMillis(); System.out.print("花费的时间:" + (end - start)); } private void CopyFile(String src, String dest) { //使用缓冲流实现复制 BufferedInputStream bis = null; BufferedInputStream bos = null; try { //1.提供读入写入文件 File file1 = new File(src); File file2 = new File(dest); //2.创建相应的节点流 FileInputStream fis = new FileInputStream(file1); FileOutputStream fos =new FileOutputStream(file2); //3.将创建的节点流的对象传递给缓冲就的构造器中 BufferedInputStream bis1 = new BufferedInputStream(fis); BufferedOutputStream bos1 = new BufferedOutputStream(fos); //4.具体的实现文件复制的操作 byte[] b = new byte[1024]; //使用数组来实现传递,用1024个字节传递 int len; while((len = bis1.read(b)) != -1){ bos1.write(b,0,len); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ //5.关闭流 if(bos != null){ try { bos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(bis != null){ try { bis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } }