inputstreamreader

InputStreamReader 是 Java 中的一个类，它可以将字节流转换为字符流。它通过使用 InputStream 和字符集来读取字节数据，并将它们解码为字符。这个类是 Reader 的一个子类，因此可以使用 Reader 中的方法，例如 read() 和 close()。

相关问题

InputStreamReader

The InputStreamReader class is a subclass of the Reader class in Java. It reads bytes from an InputStream and decodes them into characters using a specified character encoding. The decoded characters are then made available to the programmer as a stream of characters.

The InputStreamReader class is used when we want to read data from an InputStream and process it as text. It provides a convenient way to convert binary data into text data.

Here is an example of using an InputStreamReader to read data from an InputStream:

InputStream inputStream = new FileInputStream("data.txt");
InputStreamReader reader = new InputStreamReader(inputStream, "UTF-8");

int data = reader.read();
while (data != -1) {
    char ch = (char) data;
    System.out.print(ch);
    data = reader.read();
}

reader.close();
inputStream.close();

In this example, we create an InputStream from a file called "data.txt". We then create an InputStreamReader using the UTF-8 character encoding. We read data from the InputStreamReader one character at a time using the read() method. The read() method returns -1 when the end of the stream is reached. Finally, we close the InputStreamReader and the InputStream.

Inputstreamreader\

InputStreamReader 是 Java 的一个字符流类，它可以将字节流转换为字符流。

用法示例:

InputStreamReader input = new InputStreamReader(System.in);
BufferedReader reader = new BufferedReader(input);
String line = reader.readLine();

在上面的代码中, 首先创建了一个 InputStreamReader 对象 input, 它使用了系统标准输入(System.in)作为它的输入流。
然后创建了一个 BufferedReader 对象 reader, 它使用了 input 作为它的输入流。
最后，使用 readLine() 方法读取一行文本。

注意：使用 InputStreamReader 之前需要确定编码，如果不指定编码，将使用平台默认编码。
例如:

InputStreamReader input = new InputStreamReader(System.in, "UTF-8");