Implementation of spring 4mvc download file

The older version found on the Internet is org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter of spring3.
This spring4 has deprecated

the configuration and implementation of spring 4.x as follows:

	<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">  
    <property name="messageConverters">  
        <list>  
        <!-- For download -->
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>  
            <bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" >  
                <property name = "supportedMediaTypes">  
                    <list>  
                        <value>text/plain;charset=UTF-8</value>  
                    </list>  
                </property>  
            </bean>  
        </list>  
    </property>  
</bean>  

@RequestMapping("downloadExcel")
	public ResponseEntity<byte[]> downloadExcel(HttpServletRequest request)
			 {
//		String path = request.getContextPath();
//		String basePath = request.getScheme() + "://" + request.getServerName()
//				+ ":" + request.getServerPort() + path;
		 String realPath = request.getServletContext().getRealPath("/");
		String filepath = realPath + "/admin_files/ordertemplate.xls";
		File file = new File(filepath);
		HttpHeaders headers = new HttpHeaders();
		String fileName = null;
		try {
			fileName = new String("Order template file.xls".getBytes("UTF-8"),
					"iso-8859-1");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace ();
		}// In order to solve the problem of garbled Chinese names
		headers.setContentDispositionFormData("attachment", fileName);
		headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
		try {
			return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
					headers, HttpStatus.CREATED);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace ();
			return null;
		}
	}