SpringBoot整合JPA,CRUD

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/controller/UserController.java

@@ -27,8 +27,13 @@ public class UserController {
      * @return 查询出的用户
      */
     @GetMapping
-    public List<User> find() {
-        return userService.find();
+    public ResponseEntity<List<User>> find() {
+        List<User> result = userService.find();
+        if (result == null || result.size() == 0) {
+            return ResponseEntity.status(404).body(result);
+        }else {
+            return ResponseEntity.ok(result);
+        }
     }
 
     /**