Java SE 分段读取文件

23600787

public void read() throws IOException{
        File f = new File("d:\\a.xml");
        FileInputStream fis = new FileInputStream(f);
        OutputStream os = new FileOutputStream("d:\\b.xml.copy");
        byte[] buff = new byte[1024 * 1024 * 2];//2M内存
        int len;
        while ((len = fis.read(buff)) != -1) {
            os.write(buff, 0, len);
        };
        os.close(); fis.close();
}