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Benx Shen

InfoQ: What's New in Groovy 1.6 - 0 views

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    icro-benchmarks obviously rarely reflect the kind of code you have in your own projects, but the overal performa
Benx Shen

朝花夕拾--Groovy & Grails - 蛟龍居 - BlogJava - 0 views

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Benx Shen

Groovy - Embedding a Groovy Console in a Java Server Application - 0 views

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    ere to run groovysh on it's own:
Benx Shen

Groovy - User Guide - 0 views

Benx Shen

Groovy - Groovy Categories - 0 views

  • import groovy.xml.* def html = DOMBuilder.newInstance().html { head { title (class:'mytitle', 'Test') } body { p (class:'mystyle', 'This is a test.') } } use (groovy.xml.dom.DOMCategory.class) { assert html.head.title.text() == 'Test' assert html.body.p.text() == 'This is a test.' assert html.find{ it.tagName == 'body' }.tagName == 'body' assert html.getElementsByTagName('*').grep{ it.'@class' }.size() == 2 }
    • Benx Shen
       
      這裡是一個範例,可以看到透過 DOMCategory 的協助,xml dom 元素的存取直接可以用 "expression" 的方式就可以很方便地取用,而不需要很囉唆地 getElement() 或之類的
Benx Shen

Groovy - Regular Expressions - 0 views

  • Groovy supports regular expressions natively using the ~"pattern" expression
    • Benx Shen
       
      Groovy 對於 regexp 的支援有 3 個特殊的表示方式:
      ~"pattern" (create java.util.regex.Pattern)=~ (create java.util.regex.Matcher)==~ (do Matcher.matches() )
  • // lets create a regex Pattern def pattern = ~/foo/ assert pattern instanceof Pattern
  • Groovy also supports the =~ (create Matcher) and ==~ (matches regex) operators.
  • ...6 more annotations...
  • Since a Matcher coerces to a boolean by calling its find method, the =~ operator is consistent with the simple use of Perl's =~ operator, when it appears as a predicate (in 'if', 'while', etc.). The "stricter-looking" ==~ operator requires an exact match of the whole subject string.
  • def matcher = "\$abc." =~ /\$(.*)\./ // no need to double-escape! assert "\\\$(.*)\\." == /\$(.*)\./ matcher.matches(); // must be invoked assert matcher.group(1) == "abc" // is one, not zero
  • def m = "foobarfoo" =~ /o(b.*r)f/ assert m[0][1] == "bar"
  • // lets create a Matcher def matcher = "cheesecheese" =~ /cheese/ assert matcher instanceof Matcher answer = matcher.replaceAll("edam")
    • Benx Shen
       
      以下是一些 groovy regexp 的程式碼,請特別注意劃線的部份!
  • // fancier group demo matcher = "\$abc." =~ "\\\$(.*)\\." matcher.matches(); // must be invoked [Question: is this still true? Not in my experience with jsr-04.] assert matcher.group(1) == "abc" // is one, not zero
    • Benx Shen
       
      這裡需要特別注意的是,如果想要使用 matcher.group() 方法,那麼必須先執行 matcher.matches() 方法呼叫(我記得呼叫 find() 也行)。然而,如果是直接使用 groovy 的語法,那麼就可以直接使用 matcher[0][?] 的用法了!
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