java-base-maven/test1/src/main/java/RecommendationSystemTest.java

import jnr.ffi.annotations.In;
import org.junit.Test;

import java.util.*;

public class RecommendationSystemTest {

    @Test
    public void testCalculateSimilarity() {
        Map<String, Double> user1 = new HashMap<>();
        user1.put("1", 2.5);
        user1.put("2", 3.5);
        user1.put("3", 3.0);
        //user1.put(4, 3.5);
        //user1.put(5, 2.5);
        //user1.put(6, 3.0);

        Map<String, Double> user2 = new HashMap<>();
        user2.put("1", 2.5);
        user2.put("2", 3.5);
        user2.put("3", 3.5);
        user2.put("4", 4.5);
        user2.put("5", 5.0);
        //user2.put(3, 3.5);
        //user2.put(4, 4.0);

        RecommenderSystem rs = new RecommenderSystem(new HashMap<>(), 3);
        double similarity = rs.calculateSimilarity(user1, user2);
        System.out.println(similarity);
        // Check the similarity score
        //assertEquals(0.39605901719066977, similarity);
    }

    @Test
    public void testRecommendItems() {
        Map<String, Double> user1 = new HashMap<>();
        user1.put("1", 2.5);
        user1.put("2", 3.5);
        user1.put("3", 3.0);
        //user1.put(5, 2.5);
        //user1.put(6, 3.0);

        Map<String, Double> user2 = new HashMap<>();
        user2.put("1", 2.5);
        user2.put("2", 3.5);
        user2.put("3", 3.0);
        user2.put("4", 4.0);
        user2.put("7", 4.0);

        Map<String, Double> user3 = new HashMap<>();
        user3.put("1", 2.5);
        user3.put("2", 3.5);
        user3.put("3", 3.5);
        user3.put("4", 4.5);
        user3.put("5", 4.0);
        user3.put("6", 1.0);

        Map<String, Map<String, Double>> userItemRatingTable = new HashMap<>();
        userItemRatingTable.put("1", user1);
        userItemRatingTable.put("2", user2);
        userItemRatingTable.put("3", user3);

        RecommenderSystem rs = new RecommenderSystem(userItemRatingTable, 2);
        Map<String, Double> recommendations = rs.recommendItems("1", 2);

        System.out.println(recommendations);

    }

    @Test
    public void testByExcel() {
        LinkedList<Map<String, Object>> list = ExcelUtil.readExcel("/Users/alvin/Downloads/授用信各资方家数表.xlsx", "用信家数明细表", 0, 0);

        HashMap<String, Object> olds = new HashMap<>();
        for (Map<String, Object> map : list) {
            for (String s : map.keySet()) {
                if (map.get(s) != null && !"企业名称".equalsIgnoreCase(s)) {
                    olds.put(map.get("企业名称") + s, (int) Double.parseDouble(map.get(s) + ""));
                }
            }
        }


        HashSet<String> ignore = new HashSet<>();
        ignore.add("企业名称");
        ignore.add("总计");
        ignore.add("家数");

        Map<String, Map<String, Double>> userItemRatingTable = new HashMap<>();
        for (Map<String, Object> map : list) {
            HashMap<String, Double> tmpMap = new HashMap<>();
            for (String s : map.keySet()) {
                if (ignore.contains(s)) {
                    continue;
                }
                if (map.get(s) == null) {
                    tmpMap.put(s, 0D);
                } else {
                    tmpMap.put(s, Double.valueOf(map.get(s) + ""));
                }

            }
            userItemRatingTable.put(map.get("企业名称") + "", tmpMap);
        }
        RecommenderSystem rs = new RecommenderSystem(userItemRatingTable, userItemRatingTable.size());

        ArrayList<Map<String, Object>> outRes = new ArrayList<>();

        for (String companyName : userItemRatingTable.keySet()) {
            Map<String, Double> recommendations = rs.recommendItems(companyName);
            recommendations.entrySet().removeIf(entry -> entry.getValue() == 0.0);


            HashMap<String, Object> map = new HashMap<>();
            map.putAll(recommendations);

            for (String s : map.keySet()) {
                if (olds.containsKey(companyName + s)) {
                    map.put(s, "已有业务: " + olds.get(companyName + s));
                }
            }
            map.put("企业名称", companyName);
            outRes.add(map);
        }

        ExcelUtil.writeExcel("系统过滤推荐.xlsx", "推荐结果", 0,
                Arrays.asList("企业名称", "工商银行", "瀚华普惠有限公司", "平安银行", "普惠", "苏宁银行", "天能惠商贷", "邮储银行", "邮惠万家"),
                outRes);
    }

}