boolean isValidUrl(String url) { try { HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection() connection.setRequestMethod('HEAD') if (connection.getResponseCode() == 200) { return true } } catch(final MalformedURLException e) { } catch(final IOException e) { } return false }
Crazy4Groovy
Friday, January 29, 2016
HEAD HTTP Request
Tuesday, January 5, 2016
GZip HTTP Request/Response
import java.util.zip.GZIPInputStream String pageUrl = "http://www.google.com" BufferedInputStream buff = pageUrl.toURL().newInputStream(requestProperties: ['Accept-Encoding': 'gzip,deflate']) BufferedReader reader = new BufferedReader(new InputStreamReader(new GZIPInputStream(buff))) String resp = ""; reader.eachLine{ line -> resp += line }
Friday, October 24, 2014
Easy peasy file/URL binary downloading with Ant get
def ant = new AntBuilder() ant.get(src: 'http://groovy.codehaus.org/a.jpg', dest: /C:\scrap\a.jpg/, skipexisting: 'true') //or File destFile = new File(dest) if (destFile.exists()) return destFile.withOutputStream { it << src.toURL().openStream() }
Thursday, May 29, 2014
Simple Linked List
class Node implements Cloneable { private int val private int i private Node prev private Node next private static Node head private static Node last Node(int val, int i = 0) { if (!head) head = this if (!last) last = this this.i = i this.val = val } Integer at(int x, Node node = this) { //println "" + x + node.i + node.next if (x > node.i) { if (node.next != null) return this.at(x, node.next) else return null } return node.val } Node add(int val) { Node newNode = new Node(val, last.i + 1) newNode.prev = last last.next = newNode last = newNode //println "---\nadd done\n---" return head } Node reverse() { Node r = last.clone() Node prev = last.prev while (prev != null) { r.add(prev.val) prev = prev.prev } return r } } Node list = new Node(1) assert list.at(0) == 1 list.add(4).add(6) // chained adding assert list.at(0) == 1 assert list.at(1) == 4 assert list.at(2) == 6 assert list.at(3) == null assert list.reverse().at(0) == list.at(2)
Persistent (Immutable) Collections
@Grapes( @Grab(group='org.pcollections', module='pcollections', version='2.1.2') ) import org.pcollections.* PSetset = HashTreePSet.empty() set = set + "something" println set println(set + "something else") println set // immutable
Wednesday, May 28, 2014
GPars Actors
import static groovyx.gpars.actor.Actors.actor /** * A demo showing two cooperating actors. The decryptor decrypts received messages and replies them back. * The console actor sends a message to decrypt, prints out the reply and terminates both actors. * The main thread waits on both actors to finish using the join() method to prevent premature exit, * since both actors use the default actor group, which uses a daemon thread pool. * * code derrived from: http://gpars.codehaus.org/Actor */ def decryptor = actor { loop { react {message -> Thread.sleep(1000); if (!(message instanceof String)) { stop() return } reply message.reverse() } } } def console = actor { List strs = ['abc','zyx','Vvv',false]; int i = -1 loop { if (!strs[++i]) stop() decryptor << strs[i] println "Sent: ${strs[i]}" react {msg -> println "Decrypted msg: $msg" } } } [decryptor, console]*.join()
Wednesday, April 16, 2014
Spock - BDD
@Grapes([ @Grab(group='org.spockframework', module='spock-core', version='0.7-groovy-2.0') ]) import spock.lang.* // see: http://meetspock.appspot.com/ // https://github.com/spockframework/spock class MyFirstSpec extends Specification { def "test min"() { given: "min of a&b" expect: Math.min(a, b) == c where: a << [1,2] b << [4,3] c << [1,2] } def "test string length"() { given: "length of name" expect: name.size() == length where: name << ["Sally","Bill"] length << [5,4] } }
Subscribe to:
Posts (Atom)