import java.util.ArrayList
import java.util.List
import java.util.Scanner
// book对象
public class Book {
private String bId// 编号
private String bName// 书名
// getset方法
public String getbId() {
return bId
}
public void setbId(String bId) {
this.bId = bId
}
public String getbName() {
return bName
}
public void setbName(String bName) {
this.bName = bName
}
//构造方法
public Book() {
}
public Book(String bId, String bName) {
this.bId = bId
this.bName = bName
}
/*
* 增加
* */
public static List<Book>add(List<Book>list) {
Scanner sn = new Scanner(System.in)
System.out.print("请输入编号:")
String bid = sn.next()
System.out.print("请输入名称:")
String bName = sn.next()
Book book = new Book(bid, bName)
for (Book b : list) {
if (b.bId.equals(book.bId)) {
System.out.println("编号重复，请重新输入！")
return list
}
}
list.add(book)
System.out.println("添加成功！")
return list
}
/*
* 查询
* */
public static void query(List<Book>list) {
System.out.println("编号\t书名")
for (Book b : list) {
System.out.println(b.getbId() + "\t" + b.getbName())
}
}
/*
* 修改
* */
public static void update(List<Book>list) {
query(list)
Scanner sc = new Scanner(System.in)// 键盘输入的对象
System.out.print("请输入编号:")
String s = sc.next()
Integer id = null
for (int i = 0i <list.size()i++) {
id = list.get(i).getbId().equals(s) ? i : null
}
if (id == null) {
System.out.println("输入的编号不存在，请重新选择！")
return
}
System.out.print("请输入新的书名:")
String newName = sc.next()
list.get(id).setbName(newName)
System.out.print("修改成功！")
}
/*
* 删除
* */
public static void del(List<Book>list) {
query(list)
Scanner sc = new Scanner(System.in)// 键盘输入的对象
System.out.print("请输入编号:")
String s = sc.next()
for (int i = 0i <list.size()i++) {
if (list.get(i).getbId().equals(s)) {
list.remove(i)
return
}
}
System.out.println("输入的编号不存在，请重新选择！")
}
}
/*
* 测试*/
class Test {
public static void main(String[] args) {
List<Book>bookList = new ArrayList<>() // 存放所有图书的列表
bookList.add(new Book("1", "Java 基础"))// 图书的列表添加一本图书
System.out.print("欢迎进入图书管理系统,")
boolean b = true
while (b) {
System.out.print("请选择：\n1.增加\n2.查询\n3.修改\n4.删除\n5.退出\n(输入序号):")
Scanner sn = new Scanner(System.in)// 键盘输入的对象
String select = sn.next()
switch (select) {
case "1":
System.out.println("您选择了增加")
Book.add(bookList)
break
case "2":
System.out.println("您选择了查询:")
Book.query(bookList)
break
case "3":
System.out.println("您选择了修改")
Book.update(bookList)
break
case "4":
System.out.println("您选择了删除")
Book.del(bookList)
break
case "5":
System.out.println("您选择了退出")
b = false
System.out.println("退出程序！")
break
default:
System.out.println("输入错误的序号，请重新输入")
break
}
}
}
}
密码在数据库中保存。首先登陆本地数据库，然后输入管理密码，就能查找到存储用户密码的表。
图书管理系统，是一个由人、计算机等组成的能进行管理信息的收集、传递、加工、保存、维护和使用的系统，其功能一般包括图书信息管理、用户信息管理、图书借阅、图书归还、违约与毁坏赔偿、图书借还查询等等。
import java.io.Fileimport java.io.FileOutputStream
import java.util.ArrayList
import java.util.List
import java.util.Scanner
import org.dom4j.Document
import org.dom4j.DocumentHelper
import org.dom4j.Element
import org.dom4j.io.OutputFormat
import org.dom4j.io.SAXReader
import org.dom4j.io.XMLWriter
public class Book {
private int no
private String name
private double value
public Book() {
}
public Book(int no, String name, double value) {
this.no = no
this.name = name
this.value = value
}
public double getValue() {
return value
}
public void setValue(double value) {
this.value = value
}
public String getName() {
return name
}
public void setName(String name) {
this.name = name
}
public int getNo() {
return no
}
public void setNo(int no) {
this.no = no
}
}
class BookList {
private List<Book> bookList
public BookList() {
bookList = readXML()
}
public long getCount() {
return bookList.size()
}
public List<Book> getBookList() {
return bookList
}
public void setBookList(List<Book> bookList) {
this.bookList = bookList
}
public void add(Book book) {
bookList.add(book)
}
public boolean delete(String name) {
Book book = query(name)
return bookList.remove(book)
}
public void update(Book bookBefore, Book bookAfter) {
bookList.remove(bookBefore)
add(bookAfter)
}
public Book query(String name) {
Book temp = null
for (Book book : bookList) {
if (book.getName().equals(name)) {
temp = book
}
}
return temp
}
public synchronized void writeXmlDocument(Book book) {
try {
File file = new File("D:\\book.xml")
Document document = null
Element root = null
if (!file.exists()) {
// 新建student.xml文件并新增内容
document = DocumentHelper.createDocument()
root = document.addElement("Books")//添加根节点
} else {
SAXReader saxReader = new SAXReader()
document = saxReader.read(file)
root = document.getRootElement()//获得根节点
}
Element secondRoot = root.addElement("Book")//二级节点
//为二级节点添加属性，属性值为对应属性的值
secondRoot.addElement("no").setText(book.getNo() + "")
secondRoot.addElement("name").setText(book.getName() + "")
secondRoot.addElement("value").setText(book.getValue() + "")
OutputFormat format = OutputFormat.createPrettyPrint()
format.setEncoding("GBK")
XMLWriter writer = new XMLWriter(new FileOutputStream("D:\\book.xml"), format)
writer.write(document)
writer.close()
document.clearContent()
} catch (Exception e) {
e.printStackTrace()
}
}
public synchronized List<Book> readXML() {
List<Book> list = new ArrayList<Book>()//创建list集合
File file = null
try {
file = new File("D:\\book.xml")//读取文件
if (file.exists()) {
SAXReader saxReader = new SAXReader()
Document document = saxReader.read(file)
List nodeList = document.selectNodes("Books/Book")
for (int i = 0 i < nodeList.size() i++) {
Element el = (Element) nodeList.get(i)
Book book = new Book()
book.setNo(Integer.parseInt(el.elementText("no")))
book.setName(el.elementText("name"))
book.setValue(Double.parseDouble(el.elementText("value")))
list.add(book)
}
}
} catch (Exception e) {
e.printStackTrace()
}
return list
}
}
class Test {
public static void main(String args[]) {
BookList bl = new BookList()
boolean bBreak = true
while (bBreak) {
System.out.println("请输入操作代码:")
System.out.println("1：添加 2：删除 3：修改 4：查询 5:书籍统计 6：退出")
Scanner sc = new Scanner(System.in)
int code = sc.nextInt()
if (code == 1) {
System.out.println("请输入编号")
int no = sc.nextInt()
System.out.println("请输入书名")
String name = sc.next()
System.out.println("请输入售价")
double value = sc.nextDouble()
Book book = new Book(no, name, value)
bl.add(book)
bl.writeXmlDocument(book)
} else if (code == 2) {
System.out.println("请输入要删除的书籍名")
String name = sc.next()
if (bl.delete(name)) {
System.out.println("删除成功")
} else {
System.out.println("书籍不存在")
}
} else if (code == 3) {
System.out.println("请输入要修改的书籍名")
String name = sc.next()
Book bookBefore = bl.query(name)
System.out.println("请输入新的编号")
int newNo = sc.nextInt()
System.out.println("请输入新的书名")
String newName = sc.next()
System.out.println("请输入新的售价")
double value = sc.nextDouble()
Book bookAfter = new Book(newNo, newName, value)
bl.update(bookBefore, bookAfter)
} else if (code == 4) {
System.out.println("请输入要查询的书籍名")
String name = sc.next()
Book book = bl.query(name)
System.out.println("编号：" + book.getNo() + " 书名：" + book.getName() + " 售价：" + book.getValue())
} else if (code == 5) {
List<Book> list = bl.getBookList()
System.out.println("总书籍数：" + bl.getCount())
for (Book book : list) {
System.out.println("编号：" + book.getNo() + " 书名：" + book.getName() + " 售价：" + book.getValue())
}
} else if (code == 6) {
bBreak = false
}
}
}
}
jar 包 dom4j.jar jaxen-1.1.4.jar
