IO流复制文件

1. 经过测试可以复制 txt excel csv exe pdf文件其他格式的没测，估计也没问题

public class Hello {
    private static final  String LINE_SEPARATOR = System.getProperty("line.separator");//换行
    public static void main(String[] args) throws Exception {
        FileInputStream reader = new FileInputStream("d:/毕向东Java基础课堂笔记.pdf");
        FileOutputStream writer = new FileOutputStream("e:\\毕向东Java基础课堂笔记.pdf");
        int len = 0;
        byte[] buffer = new byte[1024*1024];//1MB缓存
        while((len = reader.read(buffer))!=-1){ //len = reader.read(buffer) buffer千万不要忘了，否则复制的文件超大
            writer.write(buffer ,0 , len);
            writer.flush();
        }
        System.out.println("复制成功");
        writer.close();
        reader.close();
    }
}

2.优化复制文件

    public static void main(String[] args) throws Exception {
        File src = new File("d:/Evernote_6.1.2.2292.exe");
        File des = new File("e:\\NEW_Evernote_6.1.2.2292.exe");

        copyFile(src,des);
    }

    private static void copyFile(File src, File des) throws  Exception{
        FileInputStream reader = new FileInputStream(src);
        FileOutputStream writer = new FileOutputStream(des);
        int len = 0;
        byte[] buffer = new byte[1024*1024];//1MB缓存
        while((len = reader.read(buffer))!=-1){ //len = reader.read(buffer) buffer千万不要忘了，否则复制的文件超大，陷入死循环
            writer.write(buffer ,0 , len);
            writer.flush();
        }
        System.out.println("复制成功");
        writer.close();
        reader.close();
    }