Using JIRA REST API in Groovy

Recently, I want to update my company's site using program to automatic update the issue status, adding comments, etc.
I could use JIRA Web service SOAP/XML-RPC  to access, like Jenkins JIRA plugin, but according to the JIRA document about remote API reference,  the REST API is recommended and supported.
so I decide to use JIRA REST API. I did some research, there are some possible options:
- Use JIRA Java Client library;
- Use Groovy HttpBuilder

For JIRA java client library, I get stuck with the maven, it always gives me error, and I was scared by its depencency on so many libraries.And For Groovy HttpBuilder, I have the same feeling, it depends on many 3rd party libraries.
So I decide to choose the 3rd solution. Just use Java HttpConnection object inside the Groovy script, and finally I got it works, it didn't use too many lines of codes, and Groovy 1.8 built-in support JSON parser, which is very handy.

Here I posted two groovy samples, you can easily integrate them into your own JIRA site by adding the url and account information.

Request an JIRA issue
JIRA add comment 

Note:
Note:1. JIRA URL should be like this:
    http://hostname/rest/api/2/issue/MKY-1

2. According to JIRA reference: The prefered authentication methods are HTTP Basic (when using SSL) and OAuth, in Groovy code

     ...
     def authString = "user_id:password".getBytes().encodeBase64().toString()
     conn.setRequestProperty( "Authorization", "Basic ${authString}" )

Useful resource
 JIRA REST API reference
 JIRA REST API Version 2 Tutorial