4th commit

src/main/java/com/ai/controller/UserController.java

@@ -2,10 +2,7 @@ package com.ai.controller;
 
 import com.ai.service.UserService;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.web.bind.annotation.CrossOrigin;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 @RestController
 @CrossOrigin
@@ -21,4 +18,9 @@ public class UserController {
         return userService.findAllUser().toString();
     }
 
+    @GetMapping("/findUserById/{id}")
+    public String findUserById(@PathVariable Long id){
+        return userService.findUserById(id).toString();
+    }
+
 }

src/main/java/com/ai/mapper/UserMapper.java

@@ -8,4 +8,6 @@ public interface UserMapper {
 
     List<User> findAllUser();
 
+    User findUserById(Long id);
+
 }

src/main/java/com/ai/service/UserService.java

@@ -8,4 +8,6 @@ public interface UserService {
 
     List<User> findAllUser();
 
+    User findUserById(Long id);
+
 }

src/main/java/com/ai/service/impl/UserServiceImpl.java

@@ -19,4 +19,11 @@ public class UserServiceImpl implements UserService {
         return mapper.findAllUser();
     }
 
+    @Override
+    public User findUserById(Long id) {
+        SqlSession sqlSession = MyBatisUtils.getSqlSession();
+        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
+        return mapper.findUserById(1L);
+    }
+
 }

src/main/resources/mapper/UserMapper.xml

@@ -6,7 +6,13 @@
 
     <select id="findAllUser" resultType="com.ai.pojo.User">
         select *
-        from user;
+        from user
+    </select>
+
+    <select id="findUserById" resultType="com.ai.pojo.User">
+        select *
+        from user
+        where id = #{id}
     </select>
 
 </mapper>