I got a scenario to show image from other website through servlet. I am sharing this piece of code. Icon is a servlet. If you pass any image link with parameter name 'url' then this servlet will read that image and it will print to servlet output stream

Here you need to have apache-commons-io java library to run this servlet.
  

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;

public class Icon extends HttpServlet {
 private static final long serialVersionUID = 1L;
       
    public Icon() {
        super();
    }

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  String urlImage = request.getParameter("url");
  URL url;
     InputStream is = null;
     try {
      response.setContentType("image/png");
   url = new URL(urlImage);
         is = url.openStream(); 
         InputStreamReader br = new InputStreamReader(is);
         ServletOutputStream out = response.getOutputStream();
         out.write(IOUtils.toByteArray(is));
         out.flush();
         out.close();
     } catch (MalformedURLException mue) {
          mue.printStackTrace();
     } catch (IOException ioe) {
          ioe.printStackTrace();
     } finally {
         try {
             if (is != null) is.close();
         } catch (IOException ioe) {
         }
     }
 }

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 }

}

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