[BAEL-14088] - Moved code for RequestBody and ResponseBody annotations article

spring-boot-rest/src/main/java/com/baeldung/config/RestClientConfig.java

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+package com.baeldung.config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.util.CollectionUtils;
+import org.springframework.web.client.RestTemplate;
+
+import com.baeldung.interceptors.RestTemplateHeaderModifierInterceptor;
+
+@Configuration
+public class RestClientConfig {
+
+    @Bean
+    public RestTemplate restTemplate() {
+        RestTemplate restTemplate = new RestTemplate();
+
+        List<ClientHttpRequestInterceptor> interceptors = restTemplate.getInterceptors();
+        if (CollectionUtils.isEmpty(interceptors)) {
+            interceptors = new ArrayList<ClientHttpRequestInterceptor>();
+        }
+        interceptors.add(new RestTemplateHeaderModifierInterceptor());
+        restTemplate.setInterceptors(interceptors);
+        return restTemplate;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/interceptors/RestTemplateHeaderModifierInterceptor.java

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+package com.baeldung.interceptors;
+
+import java.io.IOException;
+
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.http.client.ClientHttpResponse;
+
+public class RestTemplateHeaderModifierInterceptor implements ClientHttpRequestInterceptor {
+
+    @Override
+    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
+        ClientHttpResponse response = execution.execute(request, body); 
+        response.getHeaders().add("Foo", "bar");
+        return response;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/services/ExampleService.java

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+package com.baeldung.services;
+
+import com.baeldung.transfer.LoginForm;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ExampleService {
+
+    public boolean fakeAuthenticate(LoginForm lf) {
+        return true;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/transfer/LoginForm.java

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+package com.baeldung.transfer;
+
+public class LoginForm {
+    private String username;
+    private String password;
+
+    public LoginForm() {
+    }
+
+    public LoginForm(String username, String password) {
+        super();
+        this.username = username;
+        this.password = password;
+    }
+    
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/transfer/ResponseTransfer.java

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+package com.baeldung.transfer;
+
+public class ResponseTransfer {
+
+    private String text;
+
+    public ResponseTransfer(String text) {
+        this.setText(text);
+    }
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/web/controller/ExamplePostController.java

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+package com.baeldung.web.controller;
+
+import com.baeldung.services.ExampleService;
+import com.baeldung.transfer.ResponseTransfer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import com.baeldung.transfer.LoginForm;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+@RequestMapping("/post")
+public class ExamplePostController {
+
+    private static Logger log = LoggerFactory.getLogger(ExamplePostController.class);
+
+    @Autowired ExampleService exampleService;
+
+    @PostMapping("/request")
+    public ResponseEntity postController(@RequestBody LoginForm loginForm) {
+        log.debug("POST received - serializing LoginForm: " + loginForm.getPassword() + " " + loginForm.getUsername());
+        exampleService.fakeAuthenticate(loginForm);
+        return ResponseEntity.ok(HttpStatus.OK);
+    }
+
+    @PostMapping("/response")
+    @ResponseBody
+    public ResponseTransfer postResponseController(@RequestBody LoginForm loginForm) {
+        log.debug("POST received - serializing LoginForm: " + loginForm.getPassword() + " " + loginForm.getUsername());
+        return new ResponseTransfer("Thanks For Posting!!!");
+    }
+}

spring-boot-rest/src/test/java/com/baeldung/controllers/ExamplePostControllerRequestIntegrationTest.java

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+package com.baeldung.controllers;
+
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import com.baeldung.SpringBootRestApplication;
+import com.baeldung.services.ExampleService;
+import com.baeldung.transfer.LoginForm;
+import com.baeldung.web.controller.ExamplePostController;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SpringBootRestApplication.class)
+public class ExamplePostControllerRequestIntegrationTest {
+
+    MockMvc mockMvc;
+    @Mock private ExampleService exampleService;
+    @InjectMocks private ExamplePostController exampleController;
+    private final String jsonBody = "{\"username\": \"username\", \"password\": \"password\"}";
+    private LoginForm lf = new LoginForm();
+
+    @Before
+    public void preTest() {
+        MockitoAnnotations.initMocks(this);
+        mockMvc = MockMvcBuilders
+          .standaloneSetup(exampleController)
+          .build();
+        lf.setPassword("password");
+        lf.setUsername("username");
+    }
+
+    @Test
+    public void requestBodyTest() {
+        try {
+            when(exampleService.fakeAuthenticate(lf)).thenReturn(true);
+            mockMvc
+              .perform(post("/post/request")
+                .content(jsonBody)
+                .contentType("application/json"))
+              .andDo(print())
+              .andExpect(status().isOk());
+        } catch (Exception e) {
+            System.out.println("Exception: " + e);
+        }
+    }
+}

spring-boot-rest/src/test/java/com/baeldung/controllers/ExamplePostControllerResponseIntegrationTest.java

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+package com.baeldung.controllers;
+
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import com.baeldung.SpringBootRestApplication;
+import com.baeldung.services.ExampleService;
+import com.baeldung.transfer.LoginForm;
+import com.baeldung.web.controller.ExamplePostController;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SpringBootRestApplication.class)
+public class ExamplePostControllerResponseIntegrationTest {
+
+    MockMvc mockMvc;
+    @Mock private ExampleService exampleService;
+    @InjectMocks private ExamplePostController exampleController;
+    private final String jsonBody = "{\"username\": \"username\", \"password\": \"password\"}";
+    private LoginForm lf = new LoginForm();
+
+    @Before
+    public void preTest() {
+        MockitoAnnotations.initMocks(this);
+        mockMvc = MockMvcBuilders
+          .standaloneSetup(exampleController)
+          .build();
+        lf.setPassword("password");
+        lf.setUsername("username");
+    }
+
+    @Test
+    public void requestBodyTest() {
+        try {
+            when(exampleService.fakeAuthenticate(lf)).thenReturn(true);
+            mockMvc
+              .perform(post("/post/response")
+                .content(jsonBody)
+                .contentType("application/json"))
+              .andDo(print())
+              .andExpect(status().isOk())
+              .andExpect(content().json("{\"text\":\"Thanks For Posting!!!\"}"));
+        } catch (Exception e) {
+            System.out.println("Exception: " + e);
+        }
+    }
+}

spring-boot-rest/src/test/java/com/baeldung/resttemplate/RestTemplateLiveTest.java

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+package com.baeldung.resttemplate;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.web.client.RestTemplate;
+
+import com.baeldung.config.RestClientConfig;
+import com.baeldung.transfer.LoginForm;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = RestClientConfig.class)
+public class RestTemplateLiveTest {
+
+    @Autowired
+    RestTemplate restTemplate;
+
+    @Test
+    public void givenRestTemplate_whenRequested_thenLogAndModifyResponse() {
+        LoginForm loginForm = new LoginForm("userName", "password");
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<LoginForm> requestEntity = new HttpEntity<LoginForm>(loginForm, headers);
+
+        ResponseEntity<String> responseEntity = restTemplate.postForEntity("http://httpbin.org/post", requestEntity, String.class);
+
+        assertThat(responseEntity.getStatusCode(), is(equalTo(HttpStatus.OK)));
+        assertThat(responseEntity.getHeaders()
+            .get("Foo")
+            .get(0), is(equalTo("bar")));
+    }
+}