图书管理系统
原创
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package myio.mydata;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.RandomAccessFile;
import java.io.Serializable;
public class Book implements Serializable
{
private String id;
private String name;
private int count;
private float price;
public String getId()
{
return id;
}
public void setId(String id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public int getCount()
{
return count;
}
public void setCount(int count)
{
this.count = count;
}
public float getPrice()
{
return price;
}
public void setPrice(float price)
{
this.price = price;
}
//transient Thread th = new Thread();
public Book(String id, String name, int count,float price)
{
super();
this.id = id;
this.name = name;
this.count = count;
this.price = price;
}
public Book()
{
// TODO Auto-generated constructor stub
}
@Override
public String toString()
{
// TODO Auto-generated method stub
return "编号:"+id+" 书名:"+name+" 库存"+count+"进价:"+price;
}
public boolean equals(Object o)
{
if(this==o)
{
return true;
}
else
{
Book b = (Book)o;
return this.id==b.id&&this.name.equals(b.name)&&this.count==b.count;
}
}
public int hashCode()
{
System.out.println(name);
return id.hashCode();
}
// private void readObject(ObjectInputStream ois) throws IOException
// {
// this.id = ois.readInt();
// = ois.readUTF();
// this.count = ois.readInt();
// //this.price = ois.readFloat();
// }
//
// private void writeObject(ObjectOutputStream oos) throws IOException
// {
// oos.writeInt(this.id);
// oos.writeUTF();
// oos.writeInt(this.count);
// }
public void readObject(RandomAccessFile raf) throws IOException
{
this.id = raf.readUTF();
this.name = raf.readUTF();
this.count = raf.readInt();
this.price = raf.readFloat();
}
public void writeObject(RandomAccessFile raf) throws IOException
{
raf.writeUTF(this.id);
raf.writeUTF(this.name);
raf.writeInt(this.count);
raf.writeFloat(this.price);
}
}
package myio.mydata; /** * 书籍管理系统 */ import java.util.*; /** * 系统说明 : 1.首先系统加载 2.提供系统功能服务 3.系统退出 * * @author lzt * */ public class BookStore { static Scanner read = new Scanner(System.in); static FileOp fileOp = FileOp.getInstance(); public static void main(String[] args) { // 设置文件源 fileOp.setFileName("book.txt"); // 初始化 载入所有记录到容器 以供操作 fileOp.initial(); System.out.println("系统正在初始化···"); while (true) { opration(); } } private static void addInfo() { boolean ok = false; do { ok = false; System.out.print("\n请输入书籍编号："); String id = read.next(); if(!fileOp.checkId(id)) { System.out.print("\n请输入书籍名称："); String name = read.next(); int count = Integer.parseInt(getString("数量")); float price = Float.parseFloat(getString("价格")); // 根据输入构建书籍对象 Book book = new Book(id, name, count, price); // 将对象写入文件 if (fileOp.addInfo(book)) { System.out.println("书籍" + name + "添加成功！"); ok = true; } else { System.out.println("书籍未能添加！"); } } else { System.out.println("此id已经存在 请重新输入"); } }while(!ok); } private static void deleleInfo() { System.out.println("请输入您要删除的书籍编号："); String id = read.next(); if(fileOp.checkId(id)) { if (fileOp.deleteInfo(id)) { System.out.println("编号为" + id + "的书籍删除成功！"); } } else { System.out.println("此书籍不存在"); } } private static void updateInfo() { System.out.println("请输入需要修改的书籍编号:"); String id = read.next(); if(fileOp.checkId(id)) { System.out.print("\n请输入书籍名称："); String name = read.next(); int count = Integer.parseInt(getString("数量")); float price = Float.parseFloat(getString("价格")); // 构建书籍对象 Book book = new Book(id, name, count, price); // 将对象更新到文件 if (fileOp.updateInfo(book)) { System.out.println("编号为" + id + "的书籍的信息修改成功！"); } } else { System.out.println("此书籍不存在"); } } private static void queryInfo() { System.out.println("请输入您要查找的书籍的编号："); String id = read.next(); if (fileOp.queryInfo(id)) { System.out.println("查询成功！"); } else { System.out.println("没有这样的书籍！"); } } public static void opration() { int choice = 0; String errors = null; System.out.println("**********************************"); System.out.println("*1.查看书籍信息"); System.out.println("*2.添加书籍信息"); System.out.println("*3.删除书籍信息"); System.out.println("*4.修改书籍信息"); System.out.println("*5.查看所有信息"); System.out.println("*6.退出系统"); System.out.println("**********************************"); System.out.println("请选择您的操作:"); do { try { choice = Integer.parseInt(read.next()); errors = null; } catch (NumberFormatException e) { System.out.println("输入有误！！"); errors = "error"; System.out.println("请重新输入:"); } } while (errors != null); switch (choice) { case 1: queryInfo(); break; case 2: addInfo(); break; case 3: deleleInfo(); break; case 4: updateInfo(); break; case 5: // 查询所有 if(fileOp.queryAll()) { System.out.println("查询成功！"); } break; case 6: System.out.println("欢迎再次使用！"); System.exit(0); break; default: System.out.println("输入有误！"); System.exit(-1); } } //按格式正确获取输入内容 public static String getString(String type) { String newString = ""; boolean flag = true; do { if(flag) { System.out.print("\n请输入书籍"+type+"："); flag = false; } else { System.out.print("\n输入有误 请重新输入书籍"+type+"："); } newString = read.next(); } while (!check(type,newString)); return newString; } //格式验证 public static boolean check(String type,String s) { boolean right = false; if(type.equals("数量")) { right = s.matches("^\\d+$"); } if(type.equals("价格")) { right = s.matches("^\\d+($|\\.\\d+$)"); } return right; } }package myio.mydata;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
public class FileOp
{
private String fileName;
private FileWriter fw = null;
private BufferedWriter bw = null;
private FileReader fr = null;
private BufferedReader br = null;
private ArrayList<Book> listInfo = new ArrayList<Book>();
String[] header = { "书籍编号", "书名", "书籍数量", "书籍单价" };
private static FileOp fileOp = new FileOp();
private FileOp()
{
}
public static FileOp getInstance()
{
return fileOp;
}
// 设置文件源
public void setFileName(String fileName)
{
this.fileName = fileName;
}
// 获取文件源
public String getFileName()
{
return fileName;
}
// 获得输入输出流
public BufferedWriter getOutPutStream()
{
if (checkFile())
{
try
{
fw = new FileWriter(fileName, true);
bw = new BufferedWriter(fw);
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return bw;
}
public BufferedReader getInPutStream()
{
if (checkFile())
{
try
{
fr = new FileReader(fileName);
br = new BufferedReader(fr);
} catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return br;
// BufferedReader br = new BufferedReader();
}
// 关闭输入输出流
public void closeInPutStream()
{
try
{
fr.close();
br.close();
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void closeOutPutStream()
{
try
{
fw.close();
bw.close();
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 初始化加载
public boolean initial()
{
boolean flag = true;
// 首先清空集合
if (listInfo.size() != 0)
{
listInfo.clear();
}
BufferedReader br = getInPutStream();
try
{
br.readLine();
String strInfo = br.readLine();
while (strInfo != null)
{
String[] infos = strInfo.split("\t");
Book book = new Book();
book.setId(infos[0]);
book.setName(infos[1]);
book.setCount(Integer.parseInt(infos[2]));
book.setPrice(Float.parseFloat(infos[3]));
listInfo.add(book);
strInfo = br.readLine();
}
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
flag = false;
} finally
{
closeInPutStream();
}
// while
return flag;
}
// 增加新书籍记录
public boolean addInfo(Book book)
{
boolean flag = false; // 添加失败标志变量
Book Book = book;
BufferedWriter bw = getOutPutStream(); // 获得输出流
try
{
bw.newLine();
bw.write(book.getId() + "\t" + book.getName() + "\t" + book.getCount() + "\t"+ book.getPrice());
bw.flush(); // 清空缓冲
flag = true; // 添加记录成功
// 加入集合类中
listInfo.add(Book);
return flag;
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e)
{
e.printStackTrace();
} finally
{
closeOutPutStream(); // 关闭流
}
return flag;
}
// 删除书籍记录
public boolean deleteInfo(String id)
{
boolean flag = false;
for (int i = 0; i < listInfo.size(); i++)
{
if (id.equals(listInfo.get(i).getId()))
{
listInfo.remove(i); // 从集合中移出
System.out.println(" 删除书籍");
// 更新文件
if (updateFile())
{
flag = true; // 删除成功
}
break;
}
}
return flag;
}
// 修改指定编号的书籍信息
public boolean updateInfo(Book book)
{
boolean flag = false;
for (int i = 0; i < listInfo.size(); i++)
{
if (book.getId().equals(listInfo.get(i).getId()))
{
listInfo.set(i, book); // 更新集合
// 更新文件
if (updateFile())
{
flag = true; // 更新成功
}
break;
}
}
return flag;
}
// 根据id查询书籍信息
public boolean queryInfo(String id)
{
boolean flag = false; // 无指定书籍信息标志变量
for (int i = 0; i < listInfo.size(); i++)
{
if (id.equals(listInfo.get(i).getId()))
{
System.out.println(listInfo.get(i).getId() + "\t"
+ listInfo.get(i).getName() + "\t"
+ listInfo.get(i).getCount() + "\t"
+ listInfo.get(i).getPrice());
flag = true; // 查询成功
break;
}
}
return flag;
}
// 查询所有书籍信息
public boolean queryAll()
{
boolean flag = false; // 指定书籍信息标志变量
for (int i = 0; i < listInfo.size(); i++)
{
// 在控制台显示
System.out.println("书籍详细信息如下:");
System.out.println(header[0] + ": " + listInfo.get(i).getId()
+ " " + header[1] + ": " + listInfo.get(i).getName()
+ "\t" + header[2] + ": " + listInfo.get(i).getCount()
+ "\t" + header[3] + ": " + listInfo.get(i).getPrice());
System.out.println("\n*****************");
}
flag = true;
return flag;
}
// 更新文件
private boolean updateFile()
{
boolean flag = false;
// 重写文件-->覆盖文件
FileWriter fileWriter = null;
BufferedWriter bufferedWriter = null;
try
{
fileWriter = new FileWriter(fileName);
bufferedWriter = new BufferedWriter(fileWriter);
// **********************************************************************************
bufferedWriter.write(header[0] + "\t" + header[1] + "\t"
+ header[2] + "\t" + header[3]);
bufferedWriter.newLine();
for (int j = 0; j < listInfo.size(); j++)
{
bufferedWriter.write(listInfo.get(j).getId() + "\t"
+ listInfo.get(j).getName() + "\t"
+ listInfo.get(j).getCount() + "\t"
+ listInfo.get(j).getPrice());
bufferedWriter.newLine();
}
bufferedWriter.flush(); // 清空缓冲
flag = true; // 删除成功
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} finally
{
try
{
bufferedWriter.close();
fileWriter.close(); // 关闭流操作
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return flag;
}
// 检查文件源是否存在
public boolean checkFile()
{
File file = new File(fileName);
boolean flag = false;
// 如果指定的文件不存在,则创建该文件
if (!file.exists())
{
try
{
flag = file.createNewFile();
if (flag)
{
System.out.println(fileName + "文件创建成功!");
}
fw = new FileWriter(fileName);
bw = new BufferedWriter(fw);
bw.write(header[0] + "\t" + header[1] + "\t" + header[2] + "\t"
+ header[3]);
bw.flush();
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} finally
{
closeOutPutStream();
}
} else
{
flag = true;
}
return flag;
}
//检测id是否重复
public boolean checkId(String id)
{
for (int i = 0; i < listInfo.size(); i++)
{
if (id.equals(listInfo.get(i).getId()))
{
return true;
}
}
return false;
}
}
