按关键字查询,产品使用热度查询，利率高低排序，按类别查询。

demo/src/main/java/com/example/demo/searchService/controller/SearchServiceController.java

@@ -0,0 +1,38 @@
+package com.example.demo.searchService.controller;
+
+
+import com.example.demo.bean.Product;
+import com.example.demo.searchService.service.ProductSearchService;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.util.ArrayList;
+import java.util.List;
+
+@Controller
+public class SearchServiceController {
+    private ProductSearchService productSearchService;
+    @RequestMapping("/search")
+    public List<Product> productSearch(HttpServletRequest request, HttpServletResponse response){
+        List<Product> list = new ArrayList<Product>();
+        String productName = request.getParameter("productName");
+        String category = request.getParameter("category");
+        float intrate = Integer.parseInt(request.getParameter("intrate"));
+        if(productName!=null){
+            list = productSearchService.findByNameLike(productName);
+            //按关键字搜索
+        }else if(category!=null){
+            list = productSearchService.findByCategory(category);
+            //按产品类别搜索
+        }else if(intrate!=0){
+            list = productSearchService.findByIntrate(intrate);
+            //按利率排序由低到高
+        }else{
+            list = productSearchService.findByCount();
+            //默认按产品使用的产品的数量由高到低排序
+        }
+        return list;
+    }
+}

demo/src/main/java/com/example/demo/searchService/service/ProductSearchService.java

@@ -0,0 +1,19 @@
+package com.example.demo.searchService.service;
+
+import com.example.demo.bean.Product;
+
+import java.util.List;
+
+public interface ProductSearchService {
+    //按关键字查询
+    List<Product> findByNameLike(String productName);
+
+    //按类别查询
+    List<Product> findByCategory(String category);
+
+    //按利率从高到低
+    List<Product> findByIntrate(float intrate);
+
+    ////默认按产品使用的产品的数量由高到低排序
+    List<Product> findByCount();
+}

demo/src/main/java/com/example/demo/searchService/service/impl/ProductSearchServiceImpl.java

@@ -0,0 +1,45 @@
+package com.example.demo.searchService.service.impl;
+
+import com.example.demo.Dao.productMapper;
+import com.example.demo.Dao.usageDateMapper;
+import com.example.demo.bean.Product;
+import com.example.demo.searchService.service.ProductSearchService;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductSearchServiceImpl implements ProductSearchService {
+    @Autowired
+    productMapper productMapper;
+    usageDateMapper usageDateMapper;
+    Product product;
+
+    @Override
+    public List<Product> findByNameLike(String productName){
+        return productMapper.findByNameLike(productName);
+    }
+
+    @Override
+    public List<Product> findByCategory(String category){
+        return productMapper.findByCategory(category);
+    }
+
+    @Override
+    public List<Product> findByIntrate(float intrate){
+        return productMapper.findByIntrate(intrate);
+    }
+
+    @Override
+    public List<Product> findByCount(){
+        List<Product> productList = new ArrayList<Product>();
+        List<Integer> listusage = usageDateMapper.selectByCount();
+        int[] arr = listusage.stream().mapToInt(Integer::valueOf).toArray();
+        for(int i=0;i<arr.length;i++){
+            product = productMapper.selectProductByProductNum(arr[i]);
+            productList.add(product);
+        }
+        return productList;
+    }
+
+}