增加推荐接口

src/main/java/com/bupt/note/Controller/PaperController.java

@@ -106,6 +106,16 @@ public class PaperController {
 
     }
 
+    /**
+     * 论文推荐
+     * @return
+     */
+    @GetMapping("recommend")
+    public ResponseData recommend(){
+        List<Paper> papers=paperRepository.recommend();
+        return ResponseDataUtil.buildSuccess(papers);
+    }
+
     @PostMapping("rating")
     public ResponseData rating(@RequestBody RatingForm ratingForm,@CookieValue("user") String userName) {
         if(ratingForm.getPaperId()!=null&&ratingForm.getScore1()!=null&&ratingForm.getScore2()!=null&&ratingForm.getScore3()!=null){

src/main/java/com/bupt/note/Repository/PaperRepository.java

@@ -3,7 +3,20 @@ package com.bupt.note.Repository;
 import com.bupt.note.Model.Paper;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
+import org.springframework.data.jpa.repository.Query;
 
-public interface PaperRepository extends JpaRepository<Paper, Long>, JpaSpecificationExecutor<Paper> {
+import java.util.List;
 
+public interface PaperRepository extends JpaRepository<Paper, Long>, JpaSpecificationExecutor<Paper> {
+    @Query(value = "select *\n" +
+            "from sys_paper\n" +
+            "where id in (select a.id\n" +
+            "             from (select p.id, sum(r.score1 + r.score2 + r.score3) as score\n" +
+            "                   from sys_paper p,\n" +
+            "                        sys_paper_rating r\n" +
+            "                   where p.id = r.paper_id\n" +
+            "                   group by p.id\n" +
+            "                   order by score desc\n" +
+            "                   limit 10) a)",nativeQuery = true)
+    List<Paper> recommend();
 }

src/test/java/com/bupt/note/NoteApplicationTests.java

@@ -1,5 +1,7 @@
 package com.bupt.note;
 
+import com.bupt.note.Model.Paper;
+import com.bupt.note.Repository.PaperRepository;
 import com.bupt.note.service.FileService;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -14,6 +16,7 @@ import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.web.context.WebApplicationContext;
 
 import java.io.IOException;
+import java.util.List;
 
 @SpringBootTest
 class NoteApplicationTests {
@@ -26,6 +29,9 @@ class NoteApplicationTests {
     @Autowired
     private FileService fileService;
 
+    @Autowired
+    private PaperRepository paperRepository;
+
     @BeforeEach
     public void setUp() {
         mvc = MockMvcBuilders.webAppContextSetup(context).build();
@@ -45,4 +51,10 @@ class NoteApplicationTests {
     public void testRead() throws IOException {
         String a= fileService.getContent("E:\\JetBrains\\IdeaProjects\\back-end code\\target\\classes\\resources\\static\\txt\\1aee7062-58a7-46e0-ba4d-84a9a14f4205.txt");
     }
+
+    @Test
+    public void testPaper(){
+        List<Paper> papers=paperRepository.recommend();
+        System.out.println(papers.size());
+    }
 }