How to Write a Java Client to consume REST webservice using POST method

[Azahrudhin Mohammad]

Hi Guys,
Could any one please help to post the java client to consume the REST webservice using POST method.

say I have web service like http://localhost:8080/MyWs/sayHello/ (as it is REST not wsdl)

	@POST
        @Path("sayHello/{name}/{msg}")
	public void sayHello(@PathParam ("name") String name,@PathParam ("msg") String msg);

Browser Call will be :
http://localhost:8080/MyWs/sayHello/Peter/Hai
http://localhost:8080/MyWs/sayHello?name=Peter&msg=Hai (In case of GET)

If I wanted to write java client how can i write. (How to pass the String or request parameter and make rest call , No wsdl)

[Surender Suri]

You can use java.net.HttpUrlConnection (or) use apache client, check this http client

[Azahrudhin Mohammad]

Hi Suri,
Thanks for the quick reply.
could you please advice on below code sinipet as I am already using the HttpUrlConnection but don't know how to pass the values as part of request.

    try {
     URL url = new URL("http://localhost:8080/MyWs/sayHello/");

	//Input
	Map	params = new HashMap();
	parmas.put("name","Peter")
	params.put("msg","Hai");

      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.setDoOutput(true);
      conn.setRequestMethod("POST");
      //conn.setRequestProperty("Content-Type", "text/xml");
		String input =""; 
			//please pass the above params information here or any use any other java object to get the respose
      // Need you expertise to draft the code here start
		
	  // Need you expertise to draft the code here end
     
      OutputStream os = conn.getOutputStream();
      os.write(json.getBytes());
      //os.write(byteOut.toByteArray());
      os.flush();

      Scanner scanner;
      String response;
      if (conn.getResponseCode() != 200) {
        scanner = new Scanner(conn.getErrorStream());
        response = "Error From Server \n\n";
        throw new Exception(response);
      } else {
        scanner = new Scanner(conn.getInputStream());
        response = "Response From Server \n\n";
      }
      scanner.useDelimiter("\\Z");
      scanner.close();
      conn.disconnect();
    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    catch(Exception e)
    {
    	e.printStackTrace();
    }
    return null;
  

[William Brogden]

See this Wikipedia article on the POST format.

The body of your POST request will consist of line after line of these name=value parameters.

Bill