Configure dispatcher Servlet to connect to other host

Question

I have an upload program which uploads file and saves it to the specified host on which this application is deployed.

I want to save this files to other host. Can someone guide me what changes I must do to my dispatcher servlet for the same or any other alternate?

This question is far too broad! What exactly is your 'dispatcher servlet'? How do you want to connect to the remote host (HTTP, FTP, CIFS, etc.)? — home, Oct 19 '12 at 14:40

Yogendra Singh · Accepted Answer · 2012-10-19T15:14:58.170

-1

I Would advice to open a new connection with the other host within the Servlet and upload the file using the connection.

 int contentChar = null;
 FileInputStream inputStream = new FileInputStream(getfileRootDir()+ "/"+fileId));

 URL oracle = new URL("other server url");
 HttpURLConnection connection = (HttpURLConnection)url.openConnection();
 OutputStream outPutStream = connection.getOutputStrea()
 while ((contentChar = inputStream.read()) != -1) {
      outPutStream.write(contentLine );
 }
 inputStream .close();
 outPutStream.close(); 
 connection.close();

If you want to use BufferredReader/Writer from efficiency perspective, you may want to write as below:

   String contentLine = null;
   BufferedReader reader = new BufferedReader(
                                    new FileReader(getfileRootDir()+ "/"+fileId));

   URL oracle = new URL("other server url");
   HttpURLConnection connection = (HttpURLConnection)url.openConnection();
   OutputStream outPutStream = connection.getOutputStrea()
   Writer streamWriter = new BufferedWriter(new OutputStreamWriter(outPutStream ));
   while ((contentLine = reader.readLine()) != null) {
        streamWriter.write(contentLine );
   }
   reader.close();       
   streamWriter.close();
   outPutStream .close(); 
   connection.close();

edited Oct 19 '12 at 15:14

answered Oct 19 '12 at 14:31

Yogendra Singh

33,927
6
63
73

You are doing this with one simple java code. This can be run stand alone as well. Don't see any issue. – Yogendra Singh Oct 19 '12 at 14:37
@artbristol : Is it not that character encoding is taken care with the content being passed to write? – Yogendra Singh Oct 19 '12 at 14:41
/test/upload/files ../files -------------------------------------------------------------------This is what i am using now..i.e. path in dispatcher servlet – Angel491 Oct 19 '12 at 14:44
There is no need to use a `Writer` here. Just write the bytes of the file directly to the `OutputStream`. – artbristol Oct 19 '12 at 14:45
abcd.xxx.com:8080/test/upload/files ../files ---------------- here if u see abcd.xxx.com:8080/ ... i need my files to be uploaded at other host which is abcd...and this is what i assumed it should be.. as i want my files to be uploaded to other host.. – Angel491 Oct 19 '12 at 14:45
I am saying, do not dispatch your request to the other host. Keep it within your current host servlet. Write the above code to establish the connection and upload the file. – Yogendra Singh Oct 19 '12 at 14:47
@artbristol: I agree that `BufferredWriter` is not mandatory but its added from efficiency perspective. – Yogendra Singh Oct 19 '12 at 14:49
Yes. In one of the classes in the request processing path of current host. – Yogendra Singh Oct 19 '12 at 14:51
in controller class iam using File file1=new File(getfileRootDir()+ "/"+fileId); – Angel491 Oct 19 '12 at 14:52
@YogendraSingh using a `Writer` on a byte stream will mangle the results, sometimes but not always, so the code might appear to work at first. Please, update your answer to remove it. And read http://kunststube.net/encoding/. – artbristol Oct 19 '12 at 14:55
I believe this will read the input file. You can use this file `file1` object to write the data through out stream. I am updating the answer with couple additional steps. Please refer, – Yogendra Singh Oct 19 '12 at 14:57
@artbristol I updated the answer. If you feel it is good, may you want to remove your -1. – Yogendra Singh Oct 19 '12 at 15:18
Thanks for the update but you're still recommending using a `Writer`, which is going to mangle binary files from time to time. Why not suggest using commons-io's `IOUtils.copy`? – artbristol Oct 19 '12 at 15:20
@artbristol: Thanks for your inputs. My idea was to share the basic concept as to use the connection from first server to second server and proceed `to answer the real question`. Your valuable inputs regarding character encoding are available on this page, which may help the OP/users. – Yogendra Singh Oct 19 '12 at 15:31
hi guys,Thanks for your suggestions .i shared the location of host and local path of attachments.Problem resolved – Angel491 Oct 23 '12 at 09:47
@Angel491: Good to know, your problem is resolved. If you think that answer was helpful, please don't forget to accept. – Yogendra Singh Oct 23 '12 at 12:53

Configure dispatcher Servlet to connect to other host

1 Answers1