···swift
public class Copy {
public static void main(String[] args) {
long s=System.currentTimeMillis();
FileOutputStream fos=null;
FileInputStream fis=null;
try {
fos=new FileOutputStream("E:\\java\\a.txt");
fis=new FileInputStream("D:\\a.txt");
int len=0;
byte[] b=new byte[1024];
while((len=fis.read())!=-1) {
System.out.println(new String(b,0,len));
fos.write(b,0,len);
}
} catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
throw new RuntimeException("文件复制失败");
}finally{
try {
if(fos!=null)
fos.close();
} catch (IOException e) {
throw new RuntimeException("关闭资源失败");
}finally {
try {
if(fis!=null)
fis.close();
} catch (IOException e) {
throw new RuntimeException("关闭资源失败");
}
}
}
long m=System.currentTimeMillis();
System.out.println(m-s);
}
}
