Java-简陋的图书管理

Posted 2020-07-15 A_book

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：

 1 import java.util.Scanner;
 2 public class Menu {
 3     int Min = 1;
 4     int Max = 3;
 5     public void getMenu(){
 6         System.out.println("1、显示/2、输入/3、查找");
 7     }
 8     public void getFindMenu(){
 9         System.out.println("1、编号/2、书名/3、作者");
10     }
11     public int setMenu(){
12         System.out.println("输入序号:");
13         Scanner reader = new Scanner(System.in);
14         int num = reader.nextInt();
15         if(num >= Min || num <= Max)
16             return num;
17         else
18             return -1;
19     }
20 }

重点的管理部分：

  1 import java.io.File;
  2 import java.io.FileNotFoundException;
  3 import java.io.FileOutputStream;
  4 import java.util.Scanner;
  5 import java.io.IOException;
  6 
  7 public class Book {
  8     public void find(){
  9         Menu menu = new Menu();
 10         menu.getFindMenu();
 11         Scanner reader = new Scanner(System.in);
 12         int num = menu.setMenu();
 13         switch(num){
 14         case 1:
 15             System.out.println("请输入编号");
 16             Find(reader.next(), 0);
 17             break;
 18         case 2:
 19             System.out.println("请输入书名");
 20             Find(reader.next(), 1);
 21             break;
 22         case 3:
 23             System.out.println("请输入作者");
 24             Find(reader.next(), 2);
 25             break;
 26         }
 27     }
 28     public void Find(String s,int n){
 29         try {
 30             Scanner in = new Scanner(new File("res/Book.txt"));
 31             while (in.hasNextLine()) {
 32                 String str = in.nextLine();
 33                 String[] book = str.trim().split("#");
 34                 if(book[n].compareTo(s) == 0)
 35                     System.out.println(book[0] +"  "+ book[1] +"  "+ book[2]);
 36             }
 37         } catch (FileNotFoundException e) {
 38             e.printStackTrace();
 39         }
 40     }
 41     public String findNum(String s,int n){
 42         try {
 43             Scanner in = new Scanner(new File("res/Book.txt"));
 44             while (in.hasNextLine()) {
 45                 String str = in.nextLine();
 46                 String[] book = str.trim().split("#");
 47                 if(book[n].compareTo(s) == 0)
 48                     return book[n];
 49             }
 50         } catch (FileNotFoundException e) {
 51             e.printStackTrace();
 52         }
 53         return "没有找到";
 54     }
 55     public String message(){
 56         Scanner reader = new Scanner(System.in);
 57         String str = "";
 58         String s = "";
 59         System.out.println("请输入编号");
 60         str = reader.next();
 61         if(findNum(str,0).compareTo("没有找到") != 0){
 62             System.out.println("此编号存在输入错误");
 63             return "@@!!";
 64         }
 65         s += str + "#";
 66         System.out.println("请输入书名");
 67         str = reader.next();
 68         s += str + "#";
 69         System.out.println("请输入作者");
 70         str = reader.next();
 71         s += str + "#\n";
 72         return s;
 73     }
 74     public void setBook() {
 75         FileOutputStream fop = null;
 76         File file;
 77         String content = message();
 78         if(content.compareTo("@@!!") == 0)
 79             return ;    
 80         try {
 81             file = new File("res/Book.txt");
 82             fop = new FileOutputStream(file,true);
 83             byte[] contentInBytes = content.getBytes();
 84             fop.write(contentInBytes);
 85             fop.flush();
 86             fop.close();
 87             System.out.println("Done");
 88         } catch (IOException e) {
 89             e.printStackTrace();
 90         } finally {
 91             try {
 92                 if (fop != null) {
 93                     fop.close();
 94                 }
 95             } catch (IOException e) {
 96                 e.printStackTrace();
 97             }
 98         }
 99     }
100 
101     public void getBook() {
102         try {
103             Scanner in = new Scanner(new File("res/Book.txt"));
104             while (in.hasNextLine()) {
105                 String str = in.nextLine();
106                 splitt(str);
107             }
108         } catch (FileNotFoundException e) {
109             e.printStackTrace();
110         }
111     }
112 
113     public static String[] splitt(String str) {
114         String[] book = str.trim().split("#");
115         for (int i = 0; i < book.length; i++) {
116             System.out.println(book[i]);
117         }
118         System.out.println("\n*********************");
119         return book;
120     }
121 }

主函数部分：

 1 public class ManageBook {
 2
 3     public static void main(String[] agse){
 4         Menu menu = new Menu();
 5         Book book = new Book();
 6         while(true){
 7             menu.getMenu();
 8             int num = menu.setMenu();
 9             switch(num){
10                 case 1:
11                     book.getBook();
12                     break;
13                 case 2:
14                     book.setBook();
15                     break;
16                 case 3:
17                     book.find();
18                     break;
19                 case -1:
20                     System.out.println("输入有误");
21                     break;
22                 }
23         }
24     }
25 
26 }