一个简陋的java图书管理系统
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2024-03-12 22:54:56
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...
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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