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Simple Groovy project using Gradle

Hello fellow Groovyists :)

I have been kicking the tires on using Gradle for my Groovy projects. I had a few stumbles along the way and wanted to share what I came up with for getting a very simple example working.

build.gradle

apply plugin: 'groovy'
version = "1.0-${new Date().format('yyyyMMdd')}"

manifest.mainAttributes("Main-Class" : "com.javazquez.HelloThere")

repositories {
mavenCentral()
mavenRepo urls: "http://groovypp.artifactoryonline.com/groovypp/libs-releases-local"
}
dependencies {
groovy group: 'org.codehaus.groovy', name: 'groovy-all', version: '1.8.4'
groovy group: 'org.mongodb', name: 'mongo-java-driver', version: '2.6.5'
groovy group: 'com.gmongo', name: 'gmongo', version: '0.9.1'
testCompile "org.spockframework:spock-core:0.5-groovy-1.8"
}

jar {
from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
}

below is the the HelloThere.groovy file located src/main/groovy/com/javazquez/HelloThere

package com.javazquez
public class HelloThere {

public static void main(String []args) {
println "Hello coders!"

}

}

after running gradle build, I can navigate to the build/libs directory and run java -jar HelloThere-1.0-20111115.jar and get the following ouptut

Hello coders!

Gradle is a fantastic tool and I hope this article helps show the ease of getting a project set up.

2011 11 15

code
Gradle
Groovy
java
jvm
Uncategorized

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POP3 Gmail access with Clojure and JavaMail

I recently had the need to access gmail using Clojure. I used JavaMail to accomplish this via pop3. Below is some code that I wrote to help me get emails. Hope you find it useful Enjoy :)


(use '[clojure.contrib.duck-streams])
(def props (System/getProperties))
; Get the default Session object.
(def session (javax.mail.Session/getDefaultInstance props))

; Get a Store object that implements the specified protocol.
(def store (.getStore session "pop3s"))

;Connect to the current host using the specified username and password.
(.connect store "pop.gmail.com" "username@gmail.com" "password")

;Create a Folder object corresponding to the given name.
(def folder (. store getFolder "inbox"))

; Open the Folder.
(.open folder (javax.mail.Folder/READ_ONLY ))
; Get the messages from the server
(def messages (.getMessages folder))

(defn getFrom [message](javax.mail.internet.InternetAddress/toString (.getFrom message)))
(defn getReplyTo [message] (javax.mail.internet.InternetAddress/toString (.getReplyTo message)) )
(defn getSubject [message] (.getSubject message))

;print out the body of the message
(for [m messages] (read-lines(.getInputStream m)) )

;;;;;code for sending an email

(def props (System/getProperties))
(. props put "mail.smtp.host", "smtp.gmail.com")
(. props put "mail.smtp.port", "465")
(. props put "mail.smtp.auth", "true")
(. props put "mail.transport.protocol", "smtps")

(def session (javax.mail.Session/getDefaultInstance props nil))
(def msg (javax.mail.internet.MimeMessage. session))
(. msg setFrom (javax.mail.internet.InternetAddress. "sender@gmail.com"))
(. msg addRecipients javax.mail.Message$RecipientType/TO
"receiver@gmail.com")

(. msg setSubject "i am the subject")
(. msg setText "I am the body!!!")

(. msg setHeader "X-Mailer", "msgsend")
(. msg setSentDate (java.util.Date.))

; send the email
(def transport (. session getTransport))
(. transport connect "smtp.gmail.com" 465 "sender@gmail.com" "password")
(. transport sendMessage msg (. msg getRecipients javax.mail.Message$RecipientType/TO))
(. transport close)

2011 05 25

Administration
Clojure
code
java
jvm

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Writing a PayPal SOAP client with Java 6

I have always been mystified on the inner workings of SOAP. That was until I learned about the “wsimport” utility that comes with Java 6. It makes the entire process very easy. Below is an example of writing a SOAP client for PayPal’s Sandbox. This code will execute the SetExpressCheckout API call.

Just enter the following on your command line to generate the com.javazquez package

wsimport -keep -XadditionalHeaders -Xnocompile -p com.javazquez http://www.sandbox.paypal.com/wsdl/PayPalSvc.wsdl

open your favorite java editor(I used eclipse) and add the package(“com.javazquez”..created in the above command) to your new project

next, write some code to test out the APIs

package com.javazquez;

import javax.xml.ws.Holder;
public class TestEC {

public static void main(String[] args) {
SetExpressCheckoutReq req = new SetExpressCheckoutReq();
SetExpressCheckoutRequestType reqType = new SetExpressCheckoutRequestType();
SetExpressCheckoutRequestDetailsType details = new SetExpressCheckoutRequestDetailsType();
AddressType addr = new AddressType();
addr.cityName = "omaha";
addr.street1 = "123 main";
addr.country = CountryCodeType.US;
addr.name = "joe tester";

details.address = addr;
details.orderTotal = new BasicAmountType();
details.orderTotal.currencyID = CurrencyCodeType.USD;
details.orderTotal.value = "1.00";
details.cancelURL = "http://javazquez.com/cancel";
details.returnURL = "http://javazquez.com/return";

reqType.setVersion("2.10");

reqType.setExpressCheckoutRequestDetails = details;
req.setSetExpressCheckoutRequest(reqType);

UserIdPasswordType user = new UserIdPasswordType();
user.username = "XXX";
user.password = "XXXX";
user.signature = "XXXX";

PayPalAPIInterfaceService pp = new PayPalAPIInterfaceService();
PayPalAPIAAInterface pinterface = pp.getPayPalAPIAA();
Holder security = new Holder(new CustomSecurityHeaderType());
security.value.setCredentials(user);
try{
SetExpressCheckoutResponseType resp = pinterface.setExpressCheckout(req, security);
System.out.println(resp.token);
System.out.println(resp.correlationID);
for(ErrorType msg: resp.errors){
System.out.println(msg.longMessage);
}
}
catch(Exception ex){
System.out.println(ex.getMessage());

}
}

}

2011 02 18

code
java
jvm

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(def Bonjour-Clojure “Welcome to functional programming”)

After the briefest of introductions to functional programming in college(a la Lisp) and dabbling with Scala, I took the functional plunge and started using Clojure recently. At this point, I have only written a couple of small programs and haven’t formed much of an opinion on where it stacks against my current favorite language at the moment(Groovy). This post will follow my usual getting started with a language snippets. I plan to write more entries as I get more familiar with the language. On to the code!

—
;binding
user=> (def Bonjour-Clojure “Welcome to functional programming”)
#’user/Bonjour-Clojure
user=> Bonjour-Clojure
“Welcome to functional programming”

;items in a list can be seperated via a comma or white space..
user=> (= [ 1 2 3] [1,2,3])
true

;count the number of consonants in a string
(defn count-consonants [string] (count ( re-seq #”[^aeiouAEIOU\s]” string )))
user=> (count-consonants “writing code is fun”)
10

;count the number of vowels in a string
(defn count-vowels [string] (count ( re-seq #”[aeiouAEIOU\s]” string )))
user=> (count-vowels “lukaskiewicz”)
5

;read a file into a list.. any suggestions on other ways are welcome :)
;usage (file-lines “string_path_to_file”) or to read a webpage ((file-lines “http://javazquez.com”)
(defn file-lines [file] (with-open [rdr (clojure.java.io/reader file)] ( set ( line-seq rdr))))

;view objects class
user=>(class “Im a string”)
java.lang.String

;length of string
user=>(count “I am 18 chars long”)
18

user=>(range 1 9)
(1 2 3 4 5 6 7 8 )

;repeat a digit
user=>(repeat 4 3)
(3 3 3 3)

;list comprehension
user=>(for [fruit ["apple" "orange" "grape"] ] (str fruit))
(“apple” “orange” “grape”)

;use map to create a new list… #() is a shortcut for an anonymous
user=>(map #(* 2 %1) [1 2 3 4])
(2 4 6 8 )

; also an anonymous function
user=> (map (fn [item](* 2 item)) [1 2 3 4])
(2 4 6 8 )

;simple fiter example on a list using odd?
user=> (filter odd? [1, 2,3,4,5])
(1 3 5)

;factorial using reduce
user=> (reduce * [1 2 3])
6

;if statement
user=> (if true (str “i am true”)(str “i am false”))
“i am true”

2011 01 01

Clojure
code
java
jvm

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