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CopyFile.java
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86 lines (72 loc) · 2.48 KB
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package code_01_byte;
import java.io.*;
/**
* 使用字节流对象复制文件
*/
public class CopyFile {
public static void main(String[] args) throws IOException {
String strFile="国旗歌.mp4";
String destFile="demo3.mp4";
long start = System.currentTimeMillis();
//copyFile(strFile,destFile); //共耗时：75309毫秒
//copyFile2(strFile,destFile); //共耗时：153毫秒
//copyFile3(strFile,destFile);//共耗时：282毫秒
copyFile4(strFile,destFile);//共耗时：44毫秒
long end = System.currentTimeMillis();
System.out.println("共耗时：" + (end - start) + "毫秒");
}
/**
* 基本字节流一次读写一个字节
*/
public static void copyFile(String srcFile,String destFile) throws IOException {
FileInputStream fis=new FileInputStream(srcFile);
FileOutputStream fos=new FileOutputStream(destFile);
int by=0;
while((by=fis.read())!=-1){
fos.write(by);
}
fis.close();
fos.close();
}
/**
* 基本字节流一次读写一个字节数组
*/
public static void copyFile2(String srcFile,String destFile) throws IOException{
FileInputStream fis=new FileInputStream(srcFile);
FileOutputStream fos=new FileOutputStream(destFile);
int len=0;
byte[] bys=new byte[1024];
while((len=fis.read(bys))!=-1){
fos.write(bys,0,len);
}
fis.close();
fos.close();
}
/**
* 高效字节流一次读写一个字节
*/
public static void copyFile3(String srcFile,String destFile) throws IOException{
BufferedInputStream bis=new BufferedInputStream(new FileInputStream(srcFile));
BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(destFile));
int by=0;
while((by=bis.read())!=-1){
bos.write(by);
}
bis.close();
bos.close();
}
/**
* 高效字节流一次读写一个字节数组
*/
public static void copyFile4(String srcFile,String destFile) throws IOException{
BufferedInputStream bis=new BufferedInputStream(new FileInputStream(srcFile));
BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(destFile));
int len=0;
byte[] bys=new byte[1024];
while((len=bis.read(bys))!=-1){
bos.write(bys,0,len);
}
bis.close();
bos.close();
}
}