Java保存書店每日交易記錄

一:保存書店每日交易記錄架構

二:項目架構

三:代碼詳情

1:ModelBooks類

package BookPurchasingSystem;
import java.util.Date;

/*
 * 圖書實體類
 */
public class ModelBooks {
	//圖書編號
    private int id;
    //圖書名稱
    private String name;
	//圖書單價
    private double price;
    //圖書數量
    private int number;
    //總價
    private double money;
    //出版社
    private String Publish;
    //擴展屬性
    private String  buyingTime;
    //購買數量
    private String buyingNumber;
    
 

	//有參構造函數
    public ModelBooks(int id,String name,double price,int number,double money,String publish){
    	setId(id);
    	setName(name);
    	setPrice(price);
    	setNumber(number);
    	setPublish(publish);
    	setMoney(money);
    }
    
    //打印圖書信息
    public String toString(){
    	String message="圖書編號:"+getId()+";圖書名稱:"+getName()+";出版社:"+getPublish()
    	+";單價:"+getPrice()+";庫存數量:"+getNumber();
    	return message;
    }
   
   
/*
* 屬性訪問器      
*/
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public int getNumber() {
return number;
}

public void setNumber(int number) {
this.number = number;
}

public double getMoney() {
return money;
}

public void setMoney(double money) {
this.money = money;
}

public String getPublish() {
return Publish;
}

public void setPublish(String publish) {
Publish = publish;
}
public String getName() {
	return name;
}

public void setName(String name) {
	this.name = name;
}


public String getBuyingTime() {
	return buyingTime;
}

public void setBuyingTime(String buyingTime) {
	this.buyingTime = buyingTime;
}

public String getBuyingNumber() {
	return buyingNumber;
}

public void setBuyingNumber(String buyingNumber) {
	this.buyingNumber = buyingNumber;
}
}

2:BookManager類

package BookPurchasingSystem;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import projectActualCombat.Books;

public class BookManager {

	//字段分隔英文逗號
	 public static final  String SEPARATE_FIELD=",";
	//行分割
     public static final String  SEPARATE_LINE="\r\n";
     /*
      *保存購買圖書信息
      * Books books:圖書信息
      * String filePath:保存地址
      * String fileSuffix:保存文件的格式
      * 返回值:保存情況
      */
     public static boolean saveBooks(ModelBooks books,String filePath,String fileSuffix,String buyingNumber){
    	 //獲取當前時間
   	     Date date=new Date();
   	     //定義日期格式爲yyyyMMdd
         DateFormat format=new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
         //設置購買時間
         books.setBuyingTime(format.format(date));
         books.setBuyingNumber(buyingNumber);
         //拼接文件名
         String name=filePath+"銷售記錄"+"."+fileSuffix;
         //創建輸入流:讀取文件信息
         InputStream inputStream=null;
         try {
        	//判斷本地是否存在此文件,返回null表示文件不存在，不爲null表示存在
       	  inputStream=new FileInputStream(name);
			if (inputStream!=null) {
				////關閉流
				inputStream.close();
				//可獲取輸入流，則存在文件，採取追加文件的方式
				if(!createFile(name,false,books)){
					  return false;	
				}else {
					return true;
				}
			}
		
			return true;
		 } catch (FileNotFoundException e) {
			//輸入流獲取失敗，則不存在文件，採取新建文件方式
			if(!createFile(name,false,books)){
			  return false;	
			}else{
				return true;
			}
		}catch (IOException e) {
			e.printStackTrace();
			return false;
		}
		
     }
     
   /*
    * 創建文件
    * String name:文件名
    * boolean b:文件是否存在:true:存在，false:不存在
    * Books books:圖書對象
    */
	private static boolean createFile(String name, boolean fileExit, ModelBooks books)  {
		//創建BufferedOutputStream對象
	     BufferedOutputStream  out=null;
	     //創建StringBuffer對象,用於拼接文本內容
	     StringBuffer  stringBuffer=new StringBuffer();
		try {
		     //判斷文件是否存在
			if (fileExit) {
				//當已存在當前文件，則文件內容後追加
				//創建輸出流，用於追加文件
				out=new BufferedOutputStream(new FileOutputStream(name,true));
				////寫入內容
				 WriteStr(stringBuffer,books,out);
			}else{
				//當前文件不存在，添加內容
				//創建輸出流，，用於保存文件
				out=new BufferedOutputStream(new FileOutputStream(name));
				//定義文件標題屬性
				String[]fileSort=new String[]{
					"圖書編號","圖書名稱","購買數量","單價","總價","出版社,購買時間"	
				};
				//將標題屬性，添加到stringBuffer中去，並用SEPARATE_FIELD字段內容進行隔開
				for(String fileKey:fileSort){
					//新建時，將表頭存入本地文件
					stringBuffer.append(fileKey).append(SEPARATE_FIELD);
				}
				////寫入內容
				 WriteStr(stringBuffer,books,out);
			}
		  return true;
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
		//文件的釋放在finally中進行
		finally {
			//判讀該輸出流釋放被使用,被使用關閉該輸出流
			if (out!=null) {
				try {
					//關閉輸出流
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
					return false;
				}
			}
		}
	}
	
	
	//寫入內容
	private static  void WriteStr(StringBuffer stringBuffer,ModelBooks books,BufferedOutputStream out) throws IOException{
		//追加換行符號
		stringBuffer.append(SEPARATE_LINE);
		//添加圖書信息到stringBuffer中去
		stringBuffer.append(books.getId()).append(SEPARATE_FIELD);
		stringBuffer.append(books.getName()).append(SEPARATE_FIELD);
		stringBuffer.append(books.getBuyingNumber()).append(SEPARATE_FIELD);
		stringBuffer.append((double)books.getPrice()).append(SEPARATE_FIELD);
		stringBuffer.append((double)books.getMoney()).append(SEPARATE_FIELD);
		stringBuffer.append(books.getPublish()).append(SEPARATE_FIELD);
		stringBuffer.append(books.getBuyingTime()).append(SEPARATE_FIELD);
		//獲取stringBuffer中所有字符
		String str=stringBuffer.toString();
		//將字符轉換爲byte字節
		byte[]by=str.getBytes();
		//通過字節方式進行內容的寫入
		for(int i=0;i<by.length;i++){
			//將內容寫入到本地
			out.write(by[i]);
	    }
	}
  
    
}

3:Test類

package BookPurchasingSystem;
import java.util.ArrayList;
import java.util.Scanner;
public class Test {
    static ArrayList<ModelBooks>bookList=new ArrayList<>();//創建書架
    public static void main(String[] args) {
		 //初始化書架
  	      Init();
          //打印書架清單
  	    //將書架上所有的圖書信息打印出來
  	      PrintBooksMessage();
          //用戶購買圖書
  	      UserPurchaseBooks();
	}

    /*
     * 打印書架圖書信息
     */
   private static void PrintBooksMessage() {
		// TODO Auto-generated method stub
	  for(int i=0;i<bookList.size();i++){
	  		  System.out.println(bookList.get(i));
	  	  }
	}

/*
 * 用戶購買圖書
 */
private static void UserPurchaseBooks() {
		while(true){
	  		//獲取控制檯輸入信息
	  		Scanner scan=new Scanner(System.in);
	  		System.out.print("請輸入圖書編號:");
	  		int bookid=scan.nextInt();
	  		//根據輸入的圖書編號獲取圖書信息
	  		ModelBooks stockBooks=getBooksById(bookid);
	  		//判斷是否存在存在此圖書
	  		if (stockBooks!=null) {
					System.out.println("當前圖書信息:"+stockBooks);
					System.out.print("請輸入購買數量:");
					int bookNumber=scan.nextInt();
					//判斷庫存是否足夠
					if (bookNumber<=stockBooks.getNumber()) {
						//將購買數量加入到對象中去
						stockBooks.setBuyingNumber(Integer.toString(bookNumber));
						//將輸入信息封裝成Books對象
						ModelBooks  books=new ModelBooks(stockBooks.getId(), stockBooks.getName(), stockBooks.getPrice()*bookNumber,
								stockBooks.getNumber(), stockBooks.getMoney(),stockBooks.getPublish());
					
				if (BookManager.saveBooks(books, "C:\\Users\\Administrator\\Desktop\\", "csv",stockBooks.getBuyingNumber())) {		
							//修改庫存
							stockBooks.setNumber(stockBooks.getNumber()-bookNumber);
							System.out.println("購買成功!");
						}else{
							System.out.println("購買失敗!");
						}
					}else{
						System.out.println("庫存不足!");
					}
				}else {
					System.out.println("圖書編號輸入錯誤!");
				}
	  		
	  	}
		
	}


	/*
   * 根據輸入的圖書編號查找圖書信息，循環遍歷書架中的圖書信息，找到圖書編號相等的取出
   */
	private static ModelBooks getBooksById(int bookid) {
		// TODO Auto-generated method stub
	    for (int i = 0; i < bookList.size(); i++) {
			ModelBooks thisBooks=bookList.get(i);
			if (bookid==thisBooks.getId()) {
				return thisBooks;
			}
		}
	    return null;
	}
	
	/*
	 * 初始化書架上的圖書信息，將圖書放到書架上
	 */
	private static void Init() {
		ModelBooks goods1=new ModelBooks(101, "Java基礎入門", 44.5, 100, 4450.00,"清華大學出版社");
		ModelBooks goods2=new ModelBooks(102, "Java編程思想", 108.00, 50, 5400.00,"機械工業出版社");
		ModelBooks goods3=new ModelBooks(103, "Java基礎入門", 99.00, 100, 9900.00,"電子工業出版社");
		bookList.add(goods1);
		bookList.add(goods2);
		bookList.add(goods3);
	}
}

四:運行效果