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!
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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 ;
}
}
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重点的管理部分:
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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;
}
}
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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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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。