Postman에서 Mock Server과 API 만들고 테스트하기

src/main/java/what/the/springdatajpa/RestTemplateConfig.java

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+package what.the.springdatajpa;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.client.BufferingClientHttpRequestFactory;
+import org.springframework.http.client.SimpleClientHttpRequestFactory;
+import org.springframework.http.converter.StringHttpMessageConverter;
+import org.springframework.web.client.RestTemplate;
+
+import java.nio.charset.Charset;
+import java.time.Duration;
+
+@Configuration
+public class RestTemplateConfig {
+
+    @Bean
+    public RestTemplate restTemplate(RestTemplateBuilder restTemplateBuilder) {
+        return restTemplateBuilder
+                .requestFactory(() -> new BufferingClientHttpRequestFactory(new SimpleClientHttpRequestFactory()))
+                .setConnectTimeout(Duration.ofMillis(5000)) // connection-timeout
+                .setReadTimeout(Duration.ofMillis(5000)) // read-timeout
+                .additionalMessageConverters(new StringHttpMessageConverter(Charset.forName("UTF-8")))
+                .build();
+    }
+}

src/main/java/what/the/springdatajpa/resttemplate/ApiService.java

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+package what.the.springdatajpa.resttemplate;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.*;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+
+@Service
+@AllArgsConstructor
+@Slf4j
+public class ApiService<T> {
+
+    private final RestTemplate restTemplate;
+
+//    @Autowired
+//    public ApiService(RestTemplate restTemplate) {
+//        this.restTemplate = restTemplate;
+//    }
+/*
+    public ResponseEntity<T> get(String url, HttpHeaders httpHeaders) {
+        return callApiEndpoint(url, HttpMethod.GET, httpHeaders, null, (Class<T>) Object.class);
+    }
+
+    public ResponseEntity<T> get(String url, HttpHeaders httpHeaders, Class<T> clazz) {
+        return callApiEndpoint(url, HttpMethod.GET, httpHeaders, null, clazz);
+    }
+
+    public ResponseEntity<T> post(String url, HttpHeaders httpHeaders, Object body) {
+        return callApiEndpoint(url, HttpMethod.POST, httpHeaders, body, (Class<T>) Object.class);
+    }
+*/
+
+    public ResponseEntity<T> post(String url, HttpHeaders httpHeaders, Object body, Class<T> clazz) {
+        return callApiEndpoint(url, HttpMethod.POST, httpHeaders, body, clazz);
+    }
+
+    private ResponseEntity<T> callApiEndpoint(String url, HttpMethod httpMethod, HttpHeaders httpHeaders, Object body, Class<T> clazz) {
+        return restTemplate.exchange(url, httpMethod, new HttpEntity<>(body, httpHeaders), clazz);
+    }
+}

src/main/java/what/the/springdatajpa/resttemplate/RestTemplateTestController.java

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+package what.the.springdatajpa.resttemplate;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+import what.the.springdatajpa.resttemplate.model.PersonResponse;
+
+@RestController
+@AllArgsConstructor
+@Slf4j
+public class RestTemplateTestController {
+
+    private final RestTemplateTestService restTemplateTestService;
+
+    @PostMapping
+    public ResponseEntity<PersonResponse> restTemplateTest1() {
+        return ResponseEntity.ok(restTemplateTestService.callPostExternalServer());
+    }
+}

src/main/java/what/the/springdatajpa/resttemplate/RestTemplateTestService.java

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+package what.the.springdatajpa.resttemplate;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpHeaders;
+import org.springframework.stereotype.Service;
+import what.the.springdatajpa.resttemplate.model.Person;
+import what.the.springdatajpa.resttemplate.model.PersonResponse;
+
+@Service
+@AllArgsConstructor
+@Slf4j
+public class RestTemplateTestService {
+
+    private final ApiService<PersonResponse> apiService;
+
+    public PersonResponse callPostExternalServer() {
+        Person person = Person.builder()
+                .age(22)
+                .name("John")
+                .build();
+
+        HttpHeaders headers = new HttpHeaders();
+        PersonResponse response = apiService
+                .post("mockserver_url/testapi/first", headers, person, PersonResponse.class)
+                .getBody();
+        System.out.println(">>>> response = " + response);
+        return response;
+    }
+}

src/main/java/what/the/springdatajpa/resttemplate/model/Person.java

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+package what.the.springdatajpa.resttemplate.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Entity
+@Getter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class Person {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column
+    private Long id;
+
+    private String name;
+
+    private int age;
+}

src/main/java/what/the/springdatajpa/resttemplate/model/PersonResponse.java

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+package what.the.springdatajpa.resttemplate.model;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class PersonResponse {
+    private String result;
+    private String username;
+}

src/test/java/what/the/springdatajpa/resttemplate/RestTemplateTestServiceTest.java

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+package what.the.springdatajpa.resttemplate;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.ResponseEntity;
+import org.springframework.transaction.annotation.Transactional;
+import what.the.springdatajpa.resttemplate.model.PersonResponse;
+
+@SpringBootTest
+@Transactional
+class RestTemplateTestServiceTest {
+
+    @Autowired
+    RestTemplateTestController controller;
+
+    @Test
+    public void restTemplateTest() {
+        ResponseEntity<PersonResponse> entity = controller.restTemplateTest1();
+        System.out.println(">>> entity = " + entity.getStatusCode());
+        System.out.println(">>> entity = " + entity.getBody().getResult());
+        System.out.println(">>> entity = " + entity.getBody().getUsername());
+        Assertions.assertEquals(entity.getStatusCodeValue(), 200);
+        Assertions.assertEquals(entity.getBody().getUsername(), "John");
+    }
+}