outputstreamreader

OutputSteamReader是Java IO库中的一个类，其作用是将字节流转化成字符流。它实现了Reader接口，可以从InputStream中读取字节，并将其转换为Unicode字符流。例如，可以使用OutputStreamWriter将字符写入OutputStream中，然后使用InputStreamReader读取，以便进行处理。例如：

InputStream is = new FileInputStream("test.txt");
OutputStream os = new FileOutputStream("result.txt");
OutputStreamWriter osw = new OutputStreamWriter(os);
osw.write("hello world");
osw.close();

InputStreamReader isr = new InputStreamReader(is);
int c;
while ((c = isr.read()) != -1) {
    System.out.print((char) c);
}
isr.close();

在上面的例子中，首先创建了一个OutputStreamWriter对象，通过它将字符写入到文件中。然后创建了一个InputStreamReader对象，从源文件中读取字符，并在控制台上打印输出。需要注意的是，OutputStreamWriter和InputStreamReader都是处理流，因此需要“包装”一个底层的字节流或字符流才能使用。

相关问题

outputstreamREADER

The InputStreamReader class is a class in the Java API that is used to adapt an InputStream object to a Reader object. This class reads characters from an InputStream object and converts them into Unicode characters.

The constructors of the InputStreamReader class take as input an InputStream object and an optional character encoding type. The default character encoding type is based on the platform's default encoding, but can be specified by passing in an encoding type as a string to the constructor.

An InputStreamReader object can be used wherever a Reader object is needed, such as when reading text data from a file or network connection. The InputStreamReader class provides a convenient way to read text data from sources that return bytes of data, such as network sockets or input streams.

Example code:

InputStream inputStream = new FileInputStream("myFile.txt");
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String line;
while ((line = bufferedReader.readLine()) != null) {
    System.out.println(line);
}

bufferedReader.close();

In this example, an InputStream object is created from a file named "myFile.txt". An InputStreamReader object is then created by passing in the input stream object and specifying the character encoding type as UTF-8. Finally, a BufferedReader object is created from the InputStreamReader object, and used to read each line of text from the input file.

outputstream 逐行读取

Outputstream 是用于写入数据的，而不是读取数据。如果你想逐行读取数据，应该使用 InputStream。以下是一个使用 BufferedReader 逐行读取 InputStream 的例子：

InputStream inputStream = new FileInputStream("file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
    // 处理每一行数据
}
reader.close();

在这个例子中，我们打开一个名为 "file.txt" 的文件作为输入流，使用 InputStreamReader 将字节流转换为字符流，然后构造一个 BufferedReader 对象来逐行读取数据。在 while 循环中，我们读取每一行数据并进行处理，直到读取到了文件末尾。最后，我们关闭 BufferedReader 对象以及底层的 InputStream。