基于SSM(Spring+SpringMVC+MyBatis)实现的电子产品商城系统，商品后台管理系统

 class UserBaseCF{
	public static final int USERSIZE=943;
	public static final int ITEMSIZE=1682;
	public static final int UN=10;//某一user的最近邻居数
	//public static final int IN=10;//某一item的最近邻居数
	public int [] num=new int[USERSIZE+1];//每个用户为几部评了分
	public double[] average=new double[USERSIZE+1];//每个user的平均打分
	public double[][] rate=new double[USERSIZE+1][ITEMSIZE+1];//评分矩阵
	public double[][] DealedOfRate=new double[USERSIZE+1][ITEMSIZE+1];//针对稀疏问题处理后的评分矩阵
	Neighbor[][] NofUser =new Neighbor[USERSIZE+1][UN+1];//每个用户的最近的UN个邻居
	List<Double> x=new LinkedList<Double>();//LinkedList按照对象加入的顺序存储
	List<Double> y=new LinkedList<Double>();
	public static void main(String args[]) throws Exception{
		UserBaseCF cf=new UserBaseCF();
		if(cf.readFile("bin/ml-data_0/u1.base")){
			System.out.println("请等待，正在分析");
			cf.getAvr();//得到average[]
			cf.dealRate();//得到DealedOfRate
			cf.getNofUser();//得到NofUser
			for(int i=1;i<=UN;i++){
				System.out.println(cf.NofUser[1][i].getID()+":"+cf.NofUser[1][i].getValue());
			}
			//读文件
			File inputFile=new File("bin/ml-data_0/u1.test");
			BufferedReader reader=null;
	        if(!inputFile.exists()||inputFile.isDirectory())
					throw new FileNotFoundException();
	        reader=new BufferedReader(new FileReader(inputFile));	        
	        //写文件
	        File outputFile=new File("bin/testResult.txt");
	        FileWriter writer=null;
	        if(!outputFile.exists())
	        	if(!outputFile.createNewFile())
	        		System.out.println("输出文件创建失败");
	        writer=new FileWriter(outputFile);
	        String title ="UserID"+"\t"+"ItemID"+"\t"+"OriginalRate"+"\t"+"PredictRate"+"\r\n";
	        writer.write(title);
	        writer.flush();
	        String[] part=new String[3];
	        String tmpToRead="";
	        String tmpToWrite="";
	        while((tmpToRead=reader.readLine())!=null){
	        	part=tmpToRead.split("\t");
	        	int userID=Integer.parseInt(part[0]);
	        	int itemID=Integer.parseInt(part[1]);
	        	double originalRate=Double.parseDouble(part[2]);
	        	double predictRate=cf.predict(userID, itemID);
	        	cf.x.add(originalRate);
	        	cf.y.add(predictRate);
	        	tmpToWrite=userID+"\t"+itemID+"\t"+originalRate+"\t"+predictRate+"\r\n";
	        	writer.write(tmpToWrite);
	        	writer.flush();
	        }
			System.out.println("分析完成，请打开工程目录下bin文件夹中的testResult.txt");
			System.out.println("利用RMSE分析结果为"+cf.analyse(cf.x, cf.y));			
		}
		else 			
			System.out.println("失败");		
	}	
	//Chapter1:准备工作
	//1-1:读取文件内容，得到评分矩阵     1:读取成功       -1：读取失败
	public boolean readFile(String filePath){
		File inputFile=new File(filePath);
		BufferedReader reader=null;
        try {
			reader=new BufferedReader(new FileReader(inputFile));
		} catch (FileNotFoundException e) {
			System.out.println("文件不存在"+e.getMessage());
			return false;
		}		
        String sentence="";
        String[] part=new String[3];
        try {
			while((sentence=reader.readLine())!=null){
				part=sentence.split("\t");
				int userID=Integer.parseInt(part[0]);
				int itemID=Integer.parseInt(part[1]);
				double Rate=Double.parseDouble(part[2]);
				//构造矩阵
				rate[userID][itemID]=Rate;
			}
		} catch (NumberFormatException|IOException e) {
			System.out.println("读文件发生错误"+e.getMessage());
			return false;
		}
        return true;	
	}
		//1-2计算每个用户的平均分
	public void getLen(){//计算每个用户为几部电影打分
		for(int i=1;i<=USERSIZE;i++){
			int n=0;
			for(int j=1;j<=ITEMSIZE;j++){
				if(rate[i][j]!=0)
					n++;
			}
			num[i]=n;
		}	
	}
}