添加了getById的请求方法

src/main/java/org/cmh/backend/NewsManagement/controller/NewsController.java

@@ -24,6 +24,15 @@ public class NewsController {
         return new ResponseEntity<>(newsService.getNewsByPage(pageNo, pageSize), HttpStatus.OK);
     }
 
+    @GetMapping("/{id}")
+    public ResponseEntity<News> getNewsPage(@PathVariable Long id) {
+        try {
+            return new ResponseEntity<>(newsService.getNewsById(id), HttpStatus.OK);
+        } catch (EntityNotFoundException e) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+    }
+
     @PostMapping
     @JwtVerify
     public ResponseEntity<MessageResponse> createNews(@RequestBody NewsRequest request) {
@@ -34,7 +43,7 @@ public class NewsController {
         } catch (Exception e) {
             return new ResponseEntity<>(new MessageResponse("创建失败:" + e.getMessage()), HttpStatus.BAD_REQUEST);
         }
-        return new ResponseEntity<>(new MessageResponse("创建成功"), HttpStatus.OK);
+        return new ResponseEntity<>(new MessageResponse("创建成功"), HttpStatus.CREATED);
     }
 
     @PutMapping("/{id}")

src/main/java/org/cmh/backend/NewsManagement/service/NewsService.java

@@ -54,4 +54,11 @@ public class NewsService {
         }
         newsRepository.deleteById(id);
     }
+
+    public News getNewsById(Long id) {
+        if (!newsRepository.existsById(id)) {
+            throw new EntityNotFoundException();
+        }
+        return newsRepository.findById(id).orElse(null);
+    }
 }