2022-03-28

public class Zuoye {
    // 文件缓冲流BufferedInputStream/BufferedOutputStream
    // 字符缓冲流BufferedWriter/BufferedReader
    // 4种方式实现
    public static void main(String[] args) throws IOException {
        File file = new File("D:\java\Lxz JavaSE\zuoye.txt");

        // 使用字符输入输出流FileWriter/FileReader
        //创建字输出流对象
        FileWriter fw = new FileWriter(file);
        fw.write("窗前明月光  ");
        fw.write("疑是地上霜  ");
        fw.write("就会这两句了。。。！");
        fw.flush();
        fw.close();

        FileReader fr = new FileReader(file);
        char[] a = new char[Math.toIntExact(file.length())];
        fr.read(a);   // 读取内容到数组
        for (int i = 0; i < a.length; i++) {
        }
        System.out.println(a);
        fr.close();

        // 文件输入输出流FileInputStream/FileOutputStream
        FileInputStream fis = new FileInputStream(file);
        FileOutputStream out = new FileOutputStream("D:\java\Lxz JavaSE\zuoye1.txt");
        long start = System.currentTimeMillis();
        byte[] bytes = new byte[1024];
        while (true) {
            int r = fis.read(bytes);
            if (r == -1) {
                break;
            } else {
                out.write(bytes, 0, r);
            }
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕" + (end - start));
        fis.close();
        out.close();
    }
}