groovy 常用API

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我是靠谱客的博主威武钢铁侠，最近开发中收集的这篇文章主要介绍groovy 常用API，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

遍历Map

def citys = [:]
citys << ['全国':'www']
citys << G.getCITY_MAP()			
citys.each{
     println it.key + ":"+ it.value
}

List 查找 list 定义[] 可以理解为集合，数组

def find_list =list.findAll{item ->
	//写条件				
	item.contains('o')
}

组成以逗号分隔的字符串

assert list.jojn(',') =='one,two,three'

查找是否存在

if(list.find(){it.name='wjc'}){
    println '找到'
}

Groovy用inject方法构造Map (标准的)

def a = [1, 2, 3]     
def b = [4, 5, 6]      
def m = [:]     
[a, b].transpose().each { k, v -> m += [(k): v] }    
assert m == [1: 4, 2: 5, 3: 6]

通过inject方法，把代码缩减为一行

def m = [a, b].transpose().inject([:]) { s, l -> s + [(l[0]): l[1]] }     
assert m == [1: 4, 2: 5, 3: 6]

list去重复

def ll = [3,4,5,6,3]
//去除重复
println ll.unique()

def startDate  = anaQueryTask.START_DATE
def endDate  = anaQueryTask.END_DATE
long days = (endDate.getTime() - startDate.getTime())/(24 * 60 * 60 * 1000);
def existStatDate = []
for(i in 0 .. (days-1) ){
    existStatDate << startDate + i
}

columnNames.eachWithIndex {object, index->
      jxl.write.Label wlabel0
      wlabel0 = new jxl.write.Label(index, 0, object)
      wsheet.addCell(wlabel0)
}