java: InputStreamReader将字节的输入流变成字符的输入流，OutputStreamWriter将字符的输出流变成字节的输出流

//将缓冲区的内容读取，可以一次读取
//可以接收键盘的输入内容：需要用到字节转字符流的方法：InputStreamReader,OutputStreamWriter
//BufferedReader
BufferedReader buf = null;

//将字节的输入流变成字符的输入流
//InputStreamReader
buf = new BufferedReader( new InputStreamReader(System.in) );
System.out.println("请输入：");
String str = buf.readLine();
buf.close();
System.out.println("内容是：" + str);

buf = new BufferedReader(new FileReader("F:"+File.separator+"work"+File.separator+"work"+File.separator+"write.txt") );
String rstr = null;
StringBuffer strbuf = new StringBuffer();
while( (rstr = buf.readLine()) != null )
{
strbuf.append(rstr);
}
System.out.println("输出的内容是：");
System.out.println(strbuf);

//将字符的输出流变成字节的输出流
//OutputStreamWriter
FileWriter fw = new FileWriter("F:"+File.separator+"work"+File.separator+"work"+File.separator+"write.txt", true);
BufferedWriter bwriter = new BufferedWriter(fw);
bwriter.newLine();
bwriter.write(str);
bwriter.flush();
bwriter.close();
fw.close();