BAEL-1766: Configure a RestTemplate with RestTemplateBuilder (#4319)

spring-rest/src/main/java/org/baeldung/resttemplate/configuration/CustomClientHttpRequestInterceptor.java

@@ -0,0 +1,32 @@
+package org.baeldung.resttemplate.configuration;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.http.client.ClientHttpResponse;
+
+import java.io.IOException;
+
+/**
+ * interceptor to log incoming requests
+ */
+public class CustomClientHttpRequestInterceptor implements ClientHttpRequestInterceptor {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CustomClientHttpRequestInterceptor.class);
+
+    @Override
+    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
+
+        logRequestDetails(request);
+
+        return execution.execute(request, body);
+    }
+
+    private void logRequestDetails(HttpRequest request) {
+        LOGGER.info("Request Headers: {}", request.getHeaders());
+        LOGGER.info("Request Method: {}", request.getMethod());
+        LOGGER.info("Request URI: {}", request.getURI());
+    }
+}

spring-rest/src/main/java/org/baeldung/resttemplate/configuration/CustomRestTemplateCustomizer.java

@@ -0,0 +1,14 @@
+package org.baeldung.resttemplate.configuration;
+
+import org.springframework.boot.web.client.RestTemplateCustomizer;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * customize rest template with an interceptor
+ */
+public class CustomRestTemplateCustomizer implements RestTemplateCustomizer {
+    @Override
+    public void customize(RestTemplate restTemplate) {
+        restTemplate.getInterceptors().add(new CustomClientHttpRequestInterceptor());
+    }
+}

spring-rest/src/main/java/org/baeldung/resttemplate/configuration/HelloController.java

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+package org.baeldung.resttemplate.configuration;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * Controller to test RestTemplate configuration
+ */
+@RestController
+public class HelloController {
+
+    private static final String RESOURCE_URL = "http://localhost:8082/spring-rest/baz";
+    private RestTemplate restTemplate;
+
+    @Autowired
+    public HelloController(RestTemplateBuilder builder) {
+        this.restTemplate = builder.build();
+    }
+
+    @RequestMapping("/foo")
+    public String foo() {
+
+        ResponseEntity<String> response = restTemplate.getForEntity(RESOURCE_URL, String.class);
+
+        return response.getBody();
+    }
+
+    @RequestMapping("/baz")
+    public String baz() {
+        return "Foo";
+    }
+
+}

spring-rest/src/main/java/org/baeldung/resttemplate/configuration/RestTemplateConfigurationApplication.java

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+package org.baeldung.resttemplate.configuration;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+public class RestTemplateConfigurationApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(RestTemplateConfigurationApplication.class, args);
+    }
+}

spring-rest/src/main/java/org/baeldung/resttemplate/configuration/SpringConfig.java

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+package org.baeldung.resttemplate.configuration;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.DependsOn;
+
+@Configuration
+@EnableAutoConfiguration
+@ComponentScan("org.baeldung.resttemplate.configuration")
+public class SpringConfig {
+
+    @Bean
+    @Qualifier("customRestTemplateCustomizer")
+    public CustomRestTemplateCustomizer customRestTemplateCustomizer() {
+        return new CustomRestTemplateCustomizer();
+    }
+
+    @Bean
+    @DependsOn(value = {"customRestTemplateCustomizer"})
+    public RestTemplateBuilder restTemplateBuilder() {
+        return new RestTemplateBuilder(customRestTemplateCustomizer());
+    }
+
+}