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Groovy 2 Cookbook

Groovy 2 Cookbook

4.2 (12)
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Groovy 2 Cookbook

Groovy 2 Cookbook

4.2 (12)

Overview of this book

Get up to speed with Groovy, a language for the Java Virtual Machine (JVM) that integrates features of both object-oriented and functional programming. This book will show you the powerful features of Groovy 2 applied to real-world scenarios and how the dynamic nature of the language makes it very simple to tackle problems that would otherwise require hours or days of research and implementation. Groovy 2 Cookbook contains a vast number of recipes covering many facets of today's programming landscape. From language-specific topics such as closures and metaprogramming, to more advanced applications of Groovy flexibility such as DSL and testing techniques, this book gives you quick solutions to everyday problems. The recipes in this book start from the basics of installing Groovy and running your first scripts and continue with progressively more advanced examples that will help you to take advantage of the language's amazing features. Packed with hundreds of tried-and-true Groovy recipes, Groovy 2 Cookbook includes code segments covering many specialized APIs to work with files and collections, manipulate XML, work with REST services and JSON, create asynchronous tasks, and more. But Groovy does more than just ease traditional Java development: it brings modern programming features to the Java platform like closures, duck-typing, and metaprogramming. In this new book, you'll find code examples that you can use in your projects right away along with a discussion about how and why the solution works. Focusing on what's useful and tricky, Groovy 2 Cookbook offers a wealth of useful code for all Java and Groovy programmers, not just advanced practitioners.
Table of Contents (17 chapters)
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Groovy 2 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Executing an HTTP POST request


In this recipe, we demonstrate how to POST data to a remote HTTP server using Groovy. The POST request method is often used to upload a file or submit a web form to a server. This method sits at the opposite end of the spectrum of the HTTP GET method, used to retrieve information from the server.

How to do it...

The code required to execute a POST request with Groovy is fairly similar to the one discussed in the previous recipe, Executing an HTTP GET request, except that it's more convoluted:

  1. The sending of a POST request is expressed in the following way:

    def baseUrl = new URL('http://api.duckduckgo.com')
    def queryString = 'q=groovy&format=json&pretty=1'
    def connection = baseUrl.openConnection()
    connection.with {
      doOutput = true
      requestMethod = 'POST'
      outputStream.withWriter { writer ->
        writer << queryString
      }
      println content.text
    }
  2. The printed results will look similar to the following code snippet:

    {
       "Definition" :
        "groovy...

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