MongoDB HTTP Interface

I wondered does MongoDB has REST interface (This thought came to be while i was going through CouchDB Futon). Found something interesting with mongoDB also

1. Start your mongod process with command "mongod --rest"

2. Hit http://localhost:28017 in you browser

     ->It should list you some system admin data.

3. Try to hit the url http://localhost:28017/listDatabases?text=1 

     ->It should have given list of databases as a JSON response. For example I had bellow

{ "databases" : [ 
    { "name" : "blog",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "course",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "m101",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "mydb",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "pcat",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "school",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "students",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "test",
      "sizeOnDisk" : 218103808,
      "empty" : false }, 
    { "name" : "local",
      "sizeOnDisk" : 1,
      "empty" : true } ],
  "totalSize" : 1744830464 }

4. You could see list of commands supported over REST at the following location

http://localhost:28017/_commands

5. To  lists all documents under "posts" collection in "blog" database

http://localhost:28017/blog/posts/  

6. To see a specific document in posts collection with query {author="narayan"}

http://localhost:28017/blog/posts/?filter_author=narayan

Following link gives some comprehensive note on this HTTP interface. Read and benefit!!!

http://docs.mongodb.org/ecosystem/tools/http-interfaces/

Simple REST Example without Security

I wanted to do one sample project using CouchDB. So I have been looking in to internet for very simple REST example with Java. Could hardly find any. Hope bellow one will help many.

This article is not going to tell what is CouchDB. Assume it as a REST provider. So when I hit a url in browser , it is going to give me a text response.

Following is the REST client which shows how the same url could be fired through JAVA program to obtain the result

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package course;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class RestClient {

    public final static String endpoint = "http://127.0.0.1:5984/courses/_all_docs";

    public static void main(String[] args) {
        HttpURLConnection request = null;
        BufferedReader reader = null;
        StringBuilder response = null;
        try{
            URL endpointUrl = new URL(endpoint);
            request = (HttpURLConnection)endpointUrl.openConnection();
            request.setRequestMethod("GET");
            request.connect();
            reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
            response = new StringBuilder();
            String line;
            while((line=reader.readLine())!=null){
                response.append(line);
            }
            reader.close();
            request.disconnect();
            System.out.println(response);

         } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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