How to build file upload service in Spring Boot

<project xmlns="/POM/4.0.0" 
   xmlns:xsi="http:///2001/XMLSchema-instance" 
   xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0."> 
 
 <modelVersion>4.0.0</modelVersion> 
 <parent> 
  <groupId></groupId> 
  <artifactId>spring-boot-starter-parent</artifactId> 
  <version>1.3.</version> 
 </parent> 
 
 <groupId></groupId> 
 <artifactId>spring-boot</artifactId> 
 <version>1.0.0</version> 
 <packaging>jar</packaging> 
 
 <name>spring-boot</name> 
 <url></url> 
 
 <properties> 
  <>UTF-8</> 
  <>1.8</> 
  <>1.8</> 
 </properties> 
 
 <dependencies> 
  <dependency> 
   <groupId></groupId> 
   <artifactId>spring-boot-starter-web</artifactId> 
  </dependency> 
  <dependency> 
   <groupId>commons-io</groupId> 
   <artifactId>commons-io</artifactId> 
   <version>2.4</version> 
  </dependency> 
 </dependencies> 
 
</project> 

package ; 
 
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@Controller 
@EnableAutoConfiguration 
public class FileUploadController 
{ 
 @RequestMapping(value="/upload", method=) 
 @ResponseBody 
 public String upload(HttpServletRequest request) throws Exception 
 { 
  Part part = ("uploadfile"); 
   
  InputStream input = (); 
   
  OutputStream output = new FileOutputStream("d:/tmp/" + ()); 
  (input, output); 
   
  (); 
  (); 
   
  return "OK"; 
 } 
 
 @Bean 
 MultipartConfigElement createMultipartConfigElement() 
 { 
  MultipartConfigFactory mcf = new MultipartConfigFactory(); 
  /**
    * Set the maximum uploaded file size, default is 10MB
    */ 
  ("50MB"); 
  return (); 
 } 
  
 public static void main(String[] args) throws Exception { 
  (, args); 
 } 
} 

<dependency> 
 <groupId></groupId> 
 <artifactId>httpclient</artifactId> 
 <version>4.5.2</version> 
</dependency> 
<dependency> 
 <groupId></groupId> 
 <artifactId>httpmime</artifactId> 
 <version>4.5.2</version> 
</dependency> 

package ; 
 
import ; 
 
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public class HttpUpload 
{ 
 public static void main(String[] args)throws Exception 
 { 
  String url = "http://127.0.0.1:8080/upload"; 
  CloseableHttpClient client = (); 
   
  HttpPost httppost = new HttpPost(url); 
   
  MultipartEntityBuilder builder = (); 
  ("uploadfile", new File("D:/develop/apache-karaf-3.0.")); 
   
  HttpEntity reqEntity = (); 
   
  (reqEntity); 
   
  CloseableHttpResponse resp = (httppost); 
   
  String str = (()); 
  (str); 
   
  (); 
  (); 
 } 
}