java字节流和字符流

java字节流和字符流_第1张图片

JavaIO流,是一种计算机用语。主要是用于处理数据的传输。我们可以把流理解为一种信息传输的媒介。

流的分类

字节传输方式
字符传输方式
输入
输出
输入
输出
IO流
字节流
字符流
InputStream
OutputStream
Reader
Writer
这里列举的类都是顶层的类,没有详细展开,对于各个细分的应用领域会用到不同的类,比如文件流就会用到FileInputStream等,线程间的通信就会用到PipedInputStream等。

有关注意事项:

字符的编码方式有很多种,不同的编码方式字符做占用的字节数也不一样。
写数据时,需要指定编码方式。
读取字节流时需要指定编码方式,读取字符流时可以沿用写数据时的编码方式。
计算机的传输都是字节,字符在传输时都会转换成字节,所以会使用缓冲区。
字节流

这里引用两篇之前的文章,介绍基础的字节流操作–读取。
这里引用两篇之前的文章,介绍基础的字节流操作–写入。

字符流

这里引用两篇之前的文章,介绍基础的字符流操作–读取。
这里引用两篇之前的文章,介绍基础的字符流操作–写入。

字符串转字节数组

String to byte array using getBytes(Charset)

使用该方法将字符串转换成对应编码的字节数组。具体的字符编码可以使用
StandardCharsets.UTF_8类的成员指定。

字节数据转字符串

String transferResult = new String(b, “utf-8”);

切记字符集一定更要申明,当然还有一种方法是通过字符流,字节流的相互转换。

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