//使用输入字节流的转换流指定码表进行读取文件数据public static void readTest2() throws IOException{File file = new File("F:\\a.txt");FileInputStream fileInputStream = new FileInputStream(file);//创建字节流的转换流并且指定码表进行读取InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream,"utf-8");char[] buf = new char[1024];int length = 0;while((length = inputStreamReader.read(buf))!=-1){System.out.println(new String(buf,0,length));}}//使用输出字节流的转换流指定码表写出数据public static void writeTest2() throws IOException{File file = new File("F:\\a.txt");//建立数据的输出通道FileOutputStream fileOutputStream = new FileOutputStream(file);//把输出字节流转换成字符流并且指定编码表。OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "utf-8");outputStreamWriter.write("新中国好啊");//关闭资源
        outputStreamWriter.close();}public static void writeTest() throws IOException{File file = new File("F:\\a.txt");FileOutputStream fileOutputStream = new FileOutputStream(file);//把输出字节流转换成输出字符流。OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);outputStreamWriter.write("大家好");outputStreamWriter.close();}public static void readTest() throws IOException{InputStream in = System.in; //获取了标准的输入流。System.out.println("读到 的字符："+ (char)in.read());  //read()一次只能读取一个字节。//需要把字节流转换成字符流。InputStreamReader inputStreamReader = new InputStreamReader(in);//使用字符流的缓冲类BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String line = null;while((line = bufferedReader.readLine())!=null){System.out.println("内容："+ line);}}