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：/strong>

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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