JAVA IO ( 字节流转化为字符流 )

public class Index {
    public static void main(String[] args) {
        // 创建文件对象
        File f1 = new File("src/字节流_转化成_字符流/text.txt");
        File f2 = new File("src/字节流_转化成_字符流/textCopy.txt");
        try (
            // 创建输入输出流(java1.7开始在这里面的代码会自动关闭)
            Reader inputStream = new InputStreamReader(new FileInputStream(f1), "GBK");
            Writer outputStream = new OutputStreamWriter(new FileOutputStream(f2, true), "GBK");
        ){
            // 声明缓冲数组
            char[] b = new char[1024];
            // 声明获取字节变量的个数
            int len = -1;
            while ((len = inputStream.read(b)) != -1) {
                // 将读取到的字节数组写入目标文件
                outputStream.write(b, 0, len);
            }
        } catch (Exception e) {
            // 输出异常信息
            e.printStackTrace();
        }
    }
}