Java RESTEasy WebService - Download the image file from HTTPResponse object. - web-services

Question

I need to download a image files from the file system using RESTEasy web service and the input httpclient is JSON and the output response is
#Produces({"image/jpeg,image/png"})
Here is my client code:
public void getFileDownload(){
log("inside getServerPath....");
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(downloadWebService_URL);
JSONObject json = new JSONObject();
json.put("filePath", "/ngs/app/sample.png");
json.put("fileName", "sample.png");
log("json-->"+json.toString());
StringEntity inputJson = null;
try {
inputJson = new StringEntity(json.toString());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
log("inputJson = " + inputJson.toString());
inputJson.setContentType("application/json");
httpPost.setEntity(inputJson);
httpPost.addHeader("AppType", "TC");
log("httpPost... httpPost");
HttpResponse response = null;
try {
response = httpClient.execute(httpPost);
log("response:-->"+response);
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
catch (Exception e)
{
log("E:: " + ExceptionUtils.getStackTrace(e));
}
}
Here is my Webservice code:
#Path("/downloadservice")
public class DownloadFileWS {
private static final String FILE_PATH = "/ngs/app/sample.png";
#POST
// #Path("/images")
#Path("/{fileName}/images")
#Consumes({"application/json"})
#Produces({"image/jpeg,image/png"})
public Response getImageFile(#PathParam("fileName") String fileName) {
File file = new File(FILE_PATH);
System.out.println("File requested is : " + fileName);
Logger.getLogger("!!!!!!!!!!!"+FILE_PATH);
System.out.println("########"+FILE_PATH);
ResponseBuilder response = Response.ok((Object) file);
response.header("Content-Disposition","attachment; filename=\"sample.png\"");
return response.build();
}
The HTTP Response is:
response:-->HTTP/1.1 200 OK [Date: Tue, 19 Jul 2016 00:36:22 GMT,
Content-Length: 6192, Content-Type: image/png, Content-Disposition:
attachment; filename="sample.png", X-Powered-By: Servlet/2.5 JSP/2.1]
org.apache.http.conn.BasicManagedEntity#2ace1307
Question:
1. Based on the response, it looks like the service is sending the image in HTTPResponse object. May i know how to download the image received from HTTP Response?
2. The requirement is to click a link which calls the webservice by passing JSON as input request and the image should automatically download to the user's local machine browser.