Tip

Send data through HTTP post requests with Java agent

Suppose that you have some documents in a categorized view, by which you want to extract some data you need to send via HTTP POST requests. The agent performs a search in a view, named [VIEWNAME], getting all these documents whose category has a particular value[CATEGORYVALUE]. Then, for every document matching the condition over the category value, it builds a string(content) into which you can add all the params you have to send, in querystring form(param1=value1¶m2=value2...). Next, it opens a connection to the url([URL]) you have to call to send the data to, writes the data on a DataOutputStream object, and closes the connection. Once it has sent the HTTP Post request, if the url sends a response, the agent is able to catch it, creating a BufferedReader object, from which it writes on the server console(or on the NotesLOG database on the server which the agent runs on).


import lotus.domino.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class JavaAgent extends AgentBase {

public void NotesMain() {

try {
	Session session = getSession();
      AgentContext agentContext = session.getAgentContext();
      Database db = agentContext.getCurrentDatabase();
	 View view = db.getView("[VIEWNAME]");
      DocumentCollection dc = view.getAllDocumentsByKey("[CATEGORYVALUE]", true);
      int ndocs = dc.getCount();
      
int i = 0;
	Document doc = dc.getFirstDocument();
	while( doc != null ) {
			i++;
String field1 = doc.getItemValueString("field1");
					String enc_field1 = URLEncoder.encode(field1);
	...........................................................................(more fields)
String content= "field1="+enc_field1+"&&enc_field2="+enc_field2+...........(more params);
	 				URL url = new URL("[URL]");
					HttpURLConnection connection = (HttpURLConnection)url.openConnection();
					// Sets the request method to POST, and enable to send data 
					connection.setRequestMethod("POST"); 
					connection.setAllowUserInteraction(false); 
					connection.setDoOutput(true); 
					connection.setDoInput(true);
					connection.setUseCaches(false);
					// Sets the defaul Content-type and content lenght for POST requests 
					connection.setRequestProperty( "Content-type", "application/x-www-form-urlencoded" ); 
					connection.setRequestProperty( "Content-length", Integer.toString(content2.length())); 

					DataOutputStream out = new DataOutputStream (connection.getOutputStream ());
					out.writeBytes (content);
					out.flush ();
					out.close ();
					connection.disconnect();

					BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); 
					String line;
					while(null != (line = in.readLine())) {
						System.out.println(line);
						} 

					String title = db.getTitle();
      	 			System.out.println("Current database is "" + title + """);
      	 			
			doc = dc.getNextDocument();
    			}
	 
	 
}catch(NotesException ne) {
System.out.println("NotesError " + ne.text);}catch(Exception e) {
e.printStackTrace();
}
}
}      

This was first published in October 2001

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