java获取txt文件中以空格分割的字符串

public class Main {
    public static void main(String[] args) throws IOException {
        InputStream in = null;
        InputStreamReader reader =null;
        FileOutputStream fop = null;
        OutputStreamWriter writer = null;
        try {
            //创建文件对象，路径写相对路径
            File file = new File("src/teacher/teacher.txt");
            //新建输入字节流
            in = new FileInputStream(file);
            //新建输入字符流，将字节流转为字符流
            reader = new InputStreamReader(in);
            //新建字符缓冲区对象，方便接收字符流数据
            StringBuffer sb = new StringBuffer();
            //开始循环读取字符流中的字符
            while (reader.ready()) {
                //往字符流对象中添加字符
                sb.append((char) reader.read());  
            }             //写入文件的文件路径,因为路径不区分大小写，所以不能和上面路径相同
            File f = new File("src/Teacher.txt");
            //创建FileOutputStream对象,文件不存在会自动新建
            fop = new FileOutputStream(f);
            //创建OutputStreamWriter对象
            writer = new OutputStreamWriter(fop);
            //新建scanner并规定分割条件，因为文件中是以空格分割，所以\\s*后面有空格
            Scanner s = new Scanner(sb.toString()).useDelimiter("\\s* ");
            //将第一个空格前字符串存起来，也就是王刚
            String str = s.next();
            //将王刚添加到新文件中并以空格分割
            writer.append(str + " ");
            //同理获取s.next()也就是助教\n李铭
            Scanner s= new Scanner(s.next()).useDelimiter("\\s*");
            //因为助教和下一行的李铭不是空格分割的而是换行分割的，所以用nextLine方法获取助教
            String str= s1.nextLine();
            //将助教加到新文件中并以空格分割
            writer.append(str+ " ");
            //创建助教类的对象，并将姓名和职称传入有参构造中赋值
            Teacher assistant= new Assistant(str,str1);
            //用对象调用类中的方法，计算助教的工资
            assistant.CalcSalary();
            //添加工资到新文件中并换行
            writer.append(assistant.Salary + "\n"); 
            //同理用scanner获取讲师\n张莉
            Scanner s= new Scanner(s.next()).useDelimiter("\\s*");
            //str是上面换行后的李铭
            str = s.nextLine();
            //str是讲师
            str= s2.nextLine();
            //将李铭和讲师传入讲师类的有参构造函数中
            Teacher lecture= new Lecture(str,str1);
            //用对象调用计算工资的方法
            lecture.CalcSalary();
            //新文件中添加教师信息
            writer.append(str + " ");
            writer.append(str+ " ");
            writer.append(lecture.Salary + "\n"); 
            //同理获取副教授\n赵蒙
            Scanner s= new Scanner(s.next()).useDelimiter("\\s*");
            //str是上面换行后的张莉
            str = s.nextLine();
            //str是副教授
            str= s3.nextLine();
            //将张莉和副教授添加到副教授类的有参构造方法
            Teacher associateProfessor= new AssociateProfessor(str,str1);
            //用副教授类的对象调用工资计算方法
            associateProfessor.CalcSalary();
            //新文件中添加教师信息
            writer.append(str + " ");
            writer.append(str+ " ");
            writer.append(associateProfessor.Salary + "\n"); 
            //同理获取
            Scanner s= new Scanner(s.next()).useDelimiter("\\s*");
            //str是赵蒙
            str = s.nextLine();
            //str是教授
            str= s4.nextLine();
            Teacher professor= new Professor(str,str1);
            //同理调用工资计算方法
            professor.CalcSalary();
            //将教师信息添加进新文件中
            writer.append(str + " ");
            writer.append(str+ " ");
            //因为append不能添加int型，所以后面加""转换为字符串
            writer.append(professor.Salary + ""); 
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            //依次关闭
            writer.close();
            fop.close();
            reader.close();
            in.close();
        }
    }
}