大家好是抹茶今天給大家?guī)硪粋€java教程识虚，快速拷貝拷貝文件方法僚害。

·下列緩存拷貝方法
使用緩存拷貝適合拷貝一些中等大小的文件。

    /*Copy
     *緩存拷貝
     *Params path 路徑
     *Params newpath 新路徑
     */
    public static void Copy(String path, String newpath) throws Exception{
        InputStream in = new FileInputStream(path);
        OutputStream os = new FileOutputStream(newpath);
        byte[] b = new byte[1024];
        int len = 0;
        while((len = in.read(b))!=-1)
            os.write(b,0,len);
        os.flush();
        os.close();
        in.close();
    }

·下列緩沖拷貝方法
使用緩沖拷貝適合拷貝一些大型的文件效率高。

    /*Copys
     *緩沖拷貝
     *Params path 路徑
     *Params newpath 新路徑
     */
    public static void Copys(String path, String newpath) throws Exception{
        InputStream in = new FileInputStream(path);
        OutputStream os = new FileOutputStream(newpath);
        BufferedInputStream bin = new BufferedInputStream(in);
        BufferedOutputStream bos = new BufferedOutputStream(os);
        byte[] b = new byte[1024];
        int len = 0;
        while((len = bin.read(b))!=-1)
            bos.write(b,0,1024);
        bos.flush();
        bos.close();
        bin.close();
    }

Demo

//Demo
public class Copy
{
    public static void main(String[] args) throws Exception
    {
        long starttime = System.currentTimeMillis();
        Copy("C:\\lly.zip","D:\\lly.zip.bak");
        System.out.println(System.currentTimeMillis()-starttime+"ms");
        starttime = System.currentTimeMillis();
        Copys("C:\\lly.zip","D:\\lly.zip");
        System.out.println(System.currentTimeMillis()-starttime+"ms");
    }
    /*Copy
     *緩存拷貝
     *Params path 路徑
     *Params newpath 新路徑
     */
    public static void Copy(String path, String newpath) throws Exception{
        InputStream in = new FileInputStream(path);
        OutputStream os = new FileOutputStream(newpath);
        byte[] b = new byte[1024];
        int len = 0;
        while((len = in.read(b))!=-1)
            os.write(b,0,len);
        os.flush();
        os.close();
        in.close();
    }
    /*Copys
     *緩沖拷貝
     *Params path 路徑
     *Params newpath 新路徑
     */
    public static void Copys(String path, String newpath) throws Exception{
        InputStream in = new FileInputStream(path);
        OutputStream os = new FileOutputStream(newpath);
        BufferedInputStream bin = new BufferedInputStream(in);
        BufferedOutputStream bos = new BufferedOutputStream(os);
        byte[] b = new byte[1024];
        int len = 0;
        while((len = bin.read(b))!=-1)
            bos.write(b,0,1024);
        bos.flush();
        bos.close();
        bin.close();
    }
}