[java进阶]——IO流基本字节流和字符流，字符流中的缓冲流，递归实现多级文件拷贝

FileInputStream fis = new FileInputStream("10_16\\a.txt");
int tmp = 0;
while((tmp = fis.read()) != -1){
    System.out.print((char)tmp);
}
fis.close();

FileInputStream fis = new FileInputStream("10_16\\a.txt");//路径要两个\\
byte[] bytes = new byte[10]; //一次性读取10个字节
int len= 0;
while((len= fis.read(bytes)) != -1){
    String s = new String(bytes, 0, len);
    System.out.print(s);
}
fis.close();

FileOutputStream fos = new FileOutputStream("10_16\\a.txt",false);
        fos.write(97); //写入字符a
        fos.write('a');
        fos.write('\r'); //写入回车换行符
        byte[] bytes = {97, 98, 99};
        fos.write(bytes);//写入字符a b c
        fos.close();

//一次读取一个有效字符
        FileReader fr = new FileReader("10_16\\a.txt");
        int tmp = 0;
        while ((tmp = fr.read()) != -1){
            System.out.print((char)tmp);
        }
        fr.close();
        //一次读取多个有效字符
        FileReader fr = new FileReader("10_16\\a.txt");
        int len = 0;
        char[] chars = new char[10];
        while ((len = fr.read(chars)) != -1){
            System.out.print(new String(chars, 0, len));
        }
        fr.close();

FileWriter fw = new FileWriter("10_16\\a.txt");
fw.write("hello world");
fw.close();

private static void copyFile1(File src, File dest) throws IOException {
        //先创建文件夹
        dest.mkdir();
        //进入路径  遍历文件
        for (File file : src.listFiles()) {
            if(file.isDirectory()){
                //递归
                //这里的dest路径要好好想一下
                copyFile1(file, new File(src, file.getName()));
            }else{
                //拷贝文件
                FileInputStream fis = new FileInputStream(src);
                FileOutputStream fos = new FileOutputStream(dest);
                int tmp = 0;
                while ((tmp = fis.read()) != -1){
                    fos.write(tmp);
                }
                //关闭流
                fos.close();
                fis.close();
            }
        }

File newfile = new File("IOTest1\\a.txt");
        BufferedReader br = new BufferedReader(new FileReader(newfile));
        String s = null;
        while((s = br.readLine()) != null){
            System.out.print(s);
        }
        br.close();

BufferedWriter bw = new BufferedWriter(new FileWriter(newfile));
        bw.write("我真的快吐了~~");
        bw.newLine();
        bw.write("不喜欢IO流");
        bw.close();