spring cloud : communicate with each service - rest template

springcloud/order-service/src/main/java/com/example/orderservice/entity/OrderEntity.java

@@ -15,7 +15,7 @@ public class OrderEntity implements Serializable {
     @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @Column(nullable = false, length = 120, unique = true)
+    @Column(nullable = false, length = 120)
     private String productId;
 
     @Column(nullable = false)

springcloud/user-service/src/main/java/com/example/userservice/UserServiceApplication.java

@@ -3,8 +3,10 @@ package com.example.userservice;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
 import org.springframework.context.annotation.Bean;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.web.client.RestTemplate;
 
 @SpringBootApplication
 @EnableDiscoveryClient
@@ -18,4 +20,10 @@ public class UserServiceApplication {
     public BCryptPasswordEncoder passwordEncoder() {
         return new BCryptPasswordEncoder();
     }
+
+    @Bean
+    @LoadBalanced
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
 }

springcloud/user-service/src/main/java/com/example/userservice/service/UserServiceImpl.java

@@ -3,14 +3,20 @@ package com.example.userservice.service;
 import com.example.userservice.dto.UserDto;
 import com.example.userservice.entity.UserEntity;
 import com.example.userservice.repository.UserRepository;
+import com.example.userservice.vo.ResponseOrder;
 import lombok.RequiredArgsConstructor;
 import org.modelmapper.ModelMapper;
 import org.modelmapper.convention.MatchingStrategies;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.core.env.Environment;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -22,6 +28,9 @@ public class UserServiceImpl implements UserService {
 
     private final UserRepository userRepository;
     private final BCryptPasswordEncoder passwordEncoder;
+    private final Environment env;
+    private final RestTemplate restTemplate;
+
     private final ModelMapper mapper = new ModelMapper();
 
     @Override
@@ -41,8 +50,15 @@ public class UserServiceImpl implements UserService {
                 .orElseThrow(() -> new UsernameNotFoundException("user not found"));
 
         UserDto userDto = mapper.map(userEntity, UserDto.class);
-        userDto.setOrders(new ArrayList<>());
+//        userDto.setOrders(new ArrayList<>());
 
+        String orderUrl = String.format(env.getProperty("order_service.url"), userId);
+        ResponseEntity<List<ResponseOrder>> orderListResponse =
+                restTemplate.exchange(orderUrl, HttpMethod.GET, null,
+                new ParameterizedTypeReference<List<ResponseOrder>>() {
+        });
+        List<ResponseOrder> orderList = orderListResponse.getBody();
+        userDto.setOrders(orderList);
         return userDto;
     }