javascript/59625.html">java;">package deal;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.math.BigDecimal;import java.util.ArrayList;import java.util.HashMap;import java.util.List;/* * author:合肥工業大學 管院學院 錢洋  * email：1563178220@qq.com*/public class GetPUser {	public static List<String> readDocs(String docsPath,String code) throws IOException{		BufferedReader reader = new BufferedReader( new InputStreamReader( new FileInputStream( new File(docsPath)),code));		String s=null;		List<String> userproductscore=new ArrayList<String>();		while ((s=reader.readLine())!=null) {			userproductscore.add(s);		}		reader.close();		return userproductscore;	}	public static HashMap<String, String> MAPread(String docsPath1,String code1) throws IOException{		BufferedReader reader1 = new BufferedReader( new InputStreamReader( new FileInputStream( new File(docsPath1)),code1));		String s1=null;		HashMap<String,String> userfeaturemap=new HashMap<String,String>();		while ((s1=reader1.readLine())!=null) {			String arr[]=s1.split("/t");			String feature="";			for (int i = 1; i < arr.length; i++) {				BigDecimal db = new BigDecimal(arr[i]);				String ii = db.toPlainString();				feature+=ii+" ";			}			userfeaturemap.put(s1.split("/t")[0], feature);		}		reader1.close();		return userfeaturemap;	}	public static List<String> match(List<String> userproductscore,HashMap<String, String> userfeaturemap) throws IOException{		List<String> userscoreandfeature=new ArrayList<>();		for (int i = 0; i < userproductscore.size(); i++) {			//獲取用戶id			String user_id=userproductscore.get(i).split("/t")[0];			//獲取用戶特征			String userfeature = userfeaturemap.get(user_id);			userscoreandfeature.add(userproductscore.get(i)+"/t"+userfeature);			System.out.println(userproductscore.get(i)+"/t"+userfeature);		}		return userscoreandfeature;	}	public static void main(String[] args) throws IOException {		//讀取兩個文本		List<String> userproductscore=readDocs("data/train/ydata-ymovies-user-movie-ratings-train-v1_0.txt","gbk");		HashMap<String, String> userfeaturemap=MAPread("data/fileofuser/yahoo.txt","utf-8");		//匹配結果		match(userproductscore,userfeaturemap);	}}