2018-05-08 IO 流复制

···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);
}

}