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java中inputstreamreader用法有哪些

小億
126
2023-07-07 20:16:45
欄目: 編程語言

在Java中,InputStreamReader類是用于將字節流轉換為字符流的。以下是一些InputStreamReader的常見用法:

  1. 從標準輸入讀取字符:
InputStreamReader reader = new InputStreamReader(System.in);
int character = reader.read();
System.out.println("Read character: " + (char) character);
  1. 從文件讀取字符:
FileInputStream fileInputStream = new FileInputStream("file.txt");
InputStreamReader reader = new InputStreamReader(fileInputStream);
int character;
while ((character = reader.read()) != -1) {
System.out.print((char) character);
}
  1. 指定字符編碼讀取字符:
FileInputStream fileInputStream = new FileInputStream("file.txt");
InputStreamReader reader = new InputStreamReader(fileInputStream, "UTF-8");
int character;
while ((character = reader.read()) != -1) {
System.out.print((char) character);
}
  1. 使用緩沖區讀取字符:
FileInputStream fileInputStream = new FileInputStream("file.txt");
InputStreamReader reader = new InputStreamReader(fileInputStream);
BufferedReader bufferedReader = new BufferedReader(reader);
String line;
while ((line = bufferedReader.readLine()) != null) {
System.out.println(line);
}

這些只是InputStreamReader的一些常見用法,根據具體的需求和場景,還可以進行更多的操作和定制。

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