如何在Java中修复通过Telnet发送到Inputstream的退格符？

import java.io.IOException;
import java.io.InputStream;

public class TelnetFix {
    public static void main(String[] args) {
        try {
            InputStream inputStream = getTelnetInputStream(); // 获取Telnet发送的InputStream

            byte[] buffer = new byte[1024];
            int bytesRead;
            StringBuilder sb = new StringBuilder();

            while ((bytesRead = inputStream.read(buffer)) != -1) {
                for (int i = 0; i < bytesRead; i++) {
                    if (buffer[i] == 8) { // 退格符的ASCII码值为8
                        if (sb.length() > 0) {
                            sb.deleteCharAt(sb.length() - 1); // 删除前一个字符
                        }
                    } else {
                        sb.append((char) buffer[i]);
                    }
                }
            }

            String fixedData = sb.toString();
            System.out.println("修复后的数据：" + fixedData);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static InputStream getTelnetInputStream() {
        // 获取Telnet发送的InputStream的逻辑，这里仅作示例
        return null;
    }
}