springboot+mybatis实现产品的协同推荐代码
时间: 2023-11-28 22:50:42 浏览: 22
这里提供一个简单的示例代码,使用Spring Boot和MyBatis实现产品的协同推荐。
首先,需要创建一个数据模型类Product:
```
public class Product {
private String productId;
private String productName;
private List<String> categories;
// getter and setter methods
}
```
然后,需要创建一个数据访问对象(DAO)接口ProductMapper:
```
@Mapper
public interface ProductMapper {
List<Product> findAllProducts();
Product findProductById(String productId);
List<Product> findProductsByCategory(String category);
}
```
接下来,需要实现一个推荐算法来计算相似度,并根据相似度进行推荐。这里使用基于用户的协同过滤算法,计算用户之间的相似度,推荐与当前用户兴趣类似的产品。
```
@Service
public class CollaborativeFilteringRecommendationService {
@Autowired
private ProductMapper productMapper;
public List<Product> recommendProducts(String userId) {
// 1. 获取当前用户购买过的产品列表
List<Product> products = productMapper.findProductsByUserId(userId);
// 2. 获取所有用户购买过的产品列表
List<Product> allProducts = productMapper.findAllProducts();
// 3. 计算用户之间的相似度
Map<String, Map<String, Integer>> userProductScores = new HashMap<>();
for (Product product : allProducts) {
for (String category : product.getCategories()) {
if (!userProductScores.containsKey(category)) {
userProductScores.put(category, new HashMap<>());
}
userProductScores.get(category).put(product.getProductId(), 0);
}
}
for (Product product : products) {
for (String category : product.getCategories()) {
Map<String, Integer> productScores = userProductScores.get(category);
for (String productId : productScores.keySet()) {
if (productId.equals(product.getProductId())) {
continue;
}
productScores.put(productId, productScores.get(productId) + 1);
}
}
}
Map<String, Map<String, Double>> userSimilarities = new HashMap<>();
for (String category : userProductScores.keySet()) {
Map<String, Integer> productScores = userProductScores.get(category);
Map<String, Double> userScores = new HashMap<>();
for (String productId : productScores.keySet()) {
double score = productScores.get(productId) / Math.sqrt(products.size());
userScores.put(productId, score);
}
userSimilarities.put(category, userScores);
}
// 4. 推荐与当前用户兴趣类似的产品
Map<String, Double> productScores = new HashMap<>();
for (Map<String, Double> userScores : userSimilarities.values()) {
for (String productId : userScores.keySet()) {
if (products.stream().anyMatch(p -> p.getProductId().equals(productId))) {
continue;
}
double score = userScores.get(productId);
if (!productScores.containsKey(productId)) {
productScores.put(productId, 0.0);
}
productScores.put(productId, productScores.get(productId) + score);
}
}
List<Product> recommendedProducts = new ArrayList<>();
for (String productId : productScores.keySet()) {
double score = productScores.get(productId);
if (score >= 0.5) {
Product product = productMapper.findProductById(productId);
recommendedProducts.add(product);
}
}
return recommendedProducts;
}
}
```
最后,需要创建一个RESTful API接口来调用推荐服务:
```
@RestController
public class RecommendationController {
@Autowired
private CollaborativeFilteringRecommendationService recommendationService;
@GetMapping("/recommendations/{userId}")
public List<Product> recommendProducts(@PathVariable String userId) {
return recommendationService.recommendProducts(userId);
}
}
```
以上就是一个简单的基于Spring Boot和MyBatis实现产品协同推荐的示例代码。