下面是我学习过程中总结的几个复制文件的方法，代码如下：
/**
* 复制媒体文件,该例子是复制1.mp3文件,列出了四种方式.
*/
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class BufferedStreamCopyFiles {
public static void main(String[] args) throws IOException {
/**
* 共有四个方法,但建议用demo1,demo2;因为demo3需要创建数组, 如果文件大,光创建数组就需要很多时间;demo4一定也不要用,
* 效率非常慢.
*/
demo1();
demo2();
demo3();
demo4();
}
public static void demo1() throws FileNotFoundException, IOException {
FileInputStream fis = new FileInputStream("d:\\1.mp3");
FileOutputStream fos = new FileOutputStream("d:\\01.mp3");
int len = 0;
byte[] buf = new byte[1024];
while ((len = fis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fis.close();
fos.close();
}
public static void demo2() throws IOException {
FileInputStream fis = new FileInputStream("d:\\1.mp3");
BufferedInputStream bufis = new BufferedInputStream(fis);
FileOutputStream fos = new FileOutputStream("d:\\02.mp3");
BufferedOutputStream bufos = new BufferedOutputStream(fos);
int len = 0;
while ((len = bufis.read()) != -1) {
bufos.write(len);
}
bufis.close();
bufos.close();
}
// 不建议这种方式
public static void demo3() throws IOException {
FileInputStream fis = new FileInputStream("d:\\1.mp3");
FileOutputStream fos = new FileOutputStream("d:\\03.mp3");
byte[] buf = new byte[fis.available()];
fis.read(buf);
fos.write(buf);
fos.close();
fis.close();
}
public static void demo4() throws IOException {
FileInputStream fis = new FileInputStream("d:\\1.mp3");
FileOutputStream fos = new FileOutputStream("d:\\04.mp3");
int ch = 0;
while ((ch = fis.read()) != -1) {
fos.write(ch);
}
fos.close();
fis.close();
}
}