java中inputstreamreader用法有哪些

在Java中，InputStreamReader类是用于将字节流转换为字符流的。以下是一些InputStreamReader的常见用法：

1. 从标准输入读取字符：

InputStreamReader reader = new InputStreamReader(System.in); int character = reader.read(); System.out.println("Read character: " + (char) character); 

2. 从文件读取字符：

FileInputStream fileInputStream = new FileInputStream("file.txt"); InputStreamReader reader = new InputStreamReader(fileInputStream); int character; while ((character = reader.read()) != -1) { System.out.print((char) character); } 

3. 指定字符编码读取字符：

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); } 

4. 使用缓冲区读取字符：

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); } 

这些只是InputStreamReader的一些常见用法，根据具体的需求和场景，还可以进行更多的操作和定制。