calling external API using restTemplete from invoicing-service

cloud-gateway/target/classes/application.yml

+server:
+  port: 9090
+spring:
+  application:
+    name: api-gateway
+  cloud:
+    gateway:
+      routes:
+        - id: invoicing-service
+          uri: lb://invoicing-service
+          predicates:
+            - Path=/invoices/**
+        - id: users-service
+          uri: lb://users-service
+          predicates:
+            - Path=/users/**
+eureka:
+  client:
+    register-with-eureka: true
+    fetch-registry: true
+    service-url:
+      default-zone: http://localhost:8761/eureka/
+#  instance:
+#  hostname: localhost
+#  preferIpAddress: true
\ No newline at end of file

invoicing-service/src/main/java/org/example/InvoicingServiceApplication.java

@@ -3,6 +3,9 @@ package org.example;
 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.web.client.RestTemplate;
 
 @SpringBootApplication
 @EnableDiscoveryClient
@@ -10,4 +13,11 @@ public class InvoicingServiceApplication {
     public static void main(String[] args) {
         SpringApplication.run(InvoicingServiceApplication.class, args);
     }
+    @Bean
+    @LoadBalanced
+    public RestTemplate getRestTemplate(){
+        return new RestTemplate();
+    }
 }
+
+

invoicing-service/src/main/java/org/example/resources/ExternalAPI.java

@@ -3,6 +3,12 @@ package org.example.resources;
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
 import org.example.models.Invoice;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.RestTemplate;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -37,11 +43,7 @@ public class ExternalAPI {
                  "}";
          ArrayList<Invoice> invoices = new ArrayList<Invoice>();
          String response = null;
-         try {
          response = sendRequestToAPI(prompt);
-         } catch (IOException e) {
-             throw new RuntimeException(e);
-         }
 
          String jsonString = "";
          int firstIndex = response.toString().indexOf("[");
@@ -58,11 +60,7 @@ public class ExternalAPI {
                 "}";
         ArrayList<Invoice> invoices = new ArrayList<Invoice>();
         String response = null;
-        try {
         response = sendRequestToAPI(prompt);
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
         String jsonString = "";
         int firstIndex = response.toString().indexOf("[");
         int endIndex = response.toString().indexOf("]");
@@ -78,11 +76,7 @@ public class ExternalAPI {
                 "}";
         ArrayList<Invoice> invoices = new ArrayList<Invoice>();
         String response = null;
-        try {
         response = sendRequestToAPI(prompt);
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
         String jsonString = "";
         int firstIndex = response.toString().indexOf("[");
         int endIndex = response.toString().indexOf("]");
@@ -93,30 +87,42 @@ public class ExternalAPI {
         return invoices;
     }
 
-    public static String sendRequestToAPI(String prompt) throws IOException{
-        URL url = new URL("https://fumes-api.onrender.com/llama3");
-        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
-        connection.setRequestMethod("POST");
-        connection.setRequestProperty("Content-Type", "application/json");
-        connection.setDoOutput(true);
-        String requestBody = prompt;
-        try (OutputStream outputStream = connection.getOutputStream()) {
-            byte[] input = requestBody.getBytes("utf-8");
-            outputStream.write(input, 0, input.length);
-        }
-        StringBuilder response = new StringBuilder();
-        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"))) {
-            String line;
-            while ((line = reader.readLine()) != null) {
-                response.append(line);
-            }
-        }
-        catch (IOException e){
-            System.out.println(e.getMessage());
-        }
-        connection.disconnect();
-        System.out.println(response.toString());
-        return response.toString();
+//    public static String sendRequestToAPI(String prompt) throws IOException{
+//        URL url = new URL("https://fumes-api.onrender.com/llama3");
+//        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+//        connection.setRequestMethod("POST");
+//        connection.setRequestProperty("Content-Type", "application/json");
+//        connection.setDoOutput(true);
+//        String requestBody = prompt;
+//        try (OutputStream outputStream = connection.getOutputStream()) {
+//            byte[] input = requestBody.getBytes("utf-8");
+//            outputStream.write(input, 0, input.length);
+//        }
+//        StringBuilder response = new StringBuilder();
+//        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"))) {
+//            String line;
+//            while ((line = reader.readLine()) != null) {
+//                response.append(line);
+//            }
+//        }
+//        catch (IOException e){
+//            System.out.println(e.getMessage());
+//        }
+//        connection.disconnect();
+//        System.out.println(response.toString());
+//        return response.toString();
+//
+//    }
+    public static String sendRequestToAPI(String prompt) {
+        RestTemplate restTemplate = new RestTemplate();
+        String url = "https://fumes-api.onrender.com/llama3";
+        org.springframework.http.HttpHeaders headers = new org.springframework.http.HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<String> requestEntity = new HttpEntity<>(prompt, headers);
+        ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
+        String response = responseEntity.getBody();
+        System.out.println(response);
+        return response;
     }
 
 }

invoicing-service/src/main/java/org/example/resources/InvoiceResource.java

 package org.example.resources;
 
 import org.example.models.Invoice;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.client.RestTemplate;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -10,6 +12,8 @@ import java.util.List;
 @RestController
 @RequestMapping("/invoices")
 public class InvoiceResource {
+    @Autowired
+    RestTemplate restTemplate;
     @GetMapping("/getInvoiceDetails/{invoiceId}")
     public Invoice getInvoiceDetails(@PathVariable("invoiceId") String invoiceId){