JAVA-2113: Split or move spring-resttemplate module (#9753)

* JAVA-2113: Move Proxies With RestTemplate to spring-resttemplate-2

* JAVA-2113: Move A Custom Media Type for a Spring REST API to spring-resttemplate-2

* JAVA-2113: Move RestTemplate Post Request with JSON to spring-resttemplate-2

* JAVA-2113: Move Download an Image or a File with Spring MVC to spring-boot-mvc-3

* JAVA-2113: Fix the test

spring-boot-modules/spring-boot-mvc-3/src/main/java/com/baeldung/produceimage/ImageApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.produceimage;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.ComponentScan;
+
+@EnableAutoConfiguration
+@ComponentScan("com.baeldung.produceimage")
+public class ImageApplication {
+    public static void main(final String[] args) {
+        SpringApplication.run(ImageApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-mvc-3/src/main/java/com/baeldung/produceimage/controller/DataProducerController.java

@@ -0,0 +1,38 @@
+package com.baeldung.produceimage.controller;
+
+import org.apache.commons.io.IOUtils;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+@Controller
+public class DataProducerController {
+
+    @GetMapping("/get-text")
+    public @ResponseBody String getText() {
+        return "Hello world";
+    }
+
+    @GetMapping("/get-image")
+    public @ResponseBody byte[] getImage() throws IOException {
+        final InputStream in = getClass().getResourceAsStream("/com/baeldung/produceimage/image.jpg");
+        return IOUtils.toByteArray(in);
+    }
+
+    @GetMapping(value = "/get-image-with-media-type", produces = MediaType.IMAGE_JPEG_VALUE)
+    public @ResponseBody byte[] getImageWithMediaType() throws IOException {
+        final InputStream in = getClass().getResourceAsStream("/com/baeldung/produceimage/image.jpg");
+        return IOUtils.toByteArray(in);
+    }
+
+    @GetMapping(value = "/get-file", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
+    public @ResponseBody byte[] getFile() throws IOException {
+        final InputStream in = getClass().getResourceAsStream("/com/baeldung/produceimage/data.txt");
+        return IOUtils.toByteArray(in);
+    }
+
+}