一个简陋的java图书管理系统

本文代码为原创一个简陋的管理系统，只做功能的测试。并没有去完善所有应有的功能，只做了输入输出查找，仅供参考！

菜单部分：

import java.util.Scanner;
public class Menu {
  int Min = 1;
  int Max = 3;
  public void getMenu(){
    System.out.println("1、显示/2、输入/3、查找");
  }
  public void getFindMenu(){
    System.out.println("1、编号/2、书名/3、作者");
  }
  public int setMenu(){
    System.out.println("输入序号:");
    Scanner reader = new Scanner(System.in);
    int num = reader.nextInt();
    if(num >= Min || num <= Max)
      return num;
    else
      return -1;
  }
}

重点的管理部分：

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Scanner;
import java.io.IOException;

public class Book {
  public void find(){
    Menu menu = new Menu();
    menu.getFindMenu();
    Scanner reader = new Scanner(System.in);
    int num = menu.setMenu();
    switch(num){
    case 1:
      System.out.println("请输入编号");
      Find(reader.next(), 0);
      break;
    case 2:
      System.out.println("请输入书名");
      Find(reader.next(), 1);
      break;
    case 3:
      System.out.println("请输入作者");
      Find(reader.next(), 2);
      break;
    }
  }
  public void Find(String s,int n){
    try {
      Scanner in = new Scanner(new File("res/Book.txt"));
      while (in.hasNextLine()) {
        String str = in.nextLine();
        String[] book = str.trim().split("#");
        if(book[n].compareTo(s) == 0)
          System.out.println(book[0] +" "+ book[1] +" "+ book[2]);
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
  }
  public String findNum(String s,int n){
    try {
      Scanner in = new Scanner(new File("res/Book.txt"));
      while (in.hasNextLine()) {
        String str = in.nextLine();
        String[] book = str.trim().split("#");
        if(book[n].compareTo(s) == 0)
          return book[n];
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    return "没有找到";
  }
  public String message(){
    Scanner reader = new Scanner(System.in);
    String str = "";
    String s = "";
    System.out.println("请输入编号");
    str = reader.next();
    if(findNum(str,0).compareTo("没有找到") != 0){
      System.out.println("此编号存在输入错误");
      return "@@!!";
    }
    s += str + "#";
    System.out.println("请输入书名");
    str = reader.next();
    s += str + "#";
    System.out.println("请输入作者");
    str = reader.next();
    s += str + "#\n";
    return s;
  }
  public void setBook() {
    FileOutputStream fop = null;
    File file;
    String content = message();
    if(content.compareTo("@@!!") == 0)
      return ;
    try {
      file = new File("res/Book.txt");
      fop = new FileOutputStream(file,true);
      byte[] contentInBytes = content.getBytes();
      fop.write(contentInBytes);
      fop.flush();
      fop.close();
      System.out.println("Done");
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (fop != null) {
          fop.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  public void getBook() {
    try {
      Scanner in = new Scanner(new File("res/Book.txt"));
      while (in.hasNextLine()) {
        String str = in.nextLine();
        splitt(str);
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
  }

  public static String[] splitt(String str) {
    String[] book = str.trim().split("#");
    for (int i = 0; i < book.length; i++) {
      System.out.println(book[i]);
    }
    System.out.println("\n*********************");
    return book;
  }
}

主函数部分：

public class ManageBook {
   public static void main(String[] agse){
    Menu menu = new Menu();
    Book book = new Book();
    while(true){
      menu.getMenu();
      int num = menu.setMenu();
      switch(num){
        case 1:
          book.getBook();
          break;
        case 2:
          book.setBook();
          break;
        case 3:
          book.find();
          break;
        case -1:
          System.out.println("输入有误");
          break;
        }
    }
  }

}

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