java – JsonPath：按数组中的值过滤

我正在尝试使用Jsonpath在我的Json中按值过滤数组.我想在下面的 JSON中获取该国家的long_name.为了做到这一点,我按类型[0] ==“country”过滤adress_components但它似乎不起作用.

我试过的JsonPath：

$.results[0].address_components[?(@['types'][0]=="country")].long_name

我想要的结果是：“加拿大”.

JSON：

{
       "results" : [
          {
             "address_components" : [
                {
                   "long_name" : "5510-5520","short_name" : "5510-5520","types" : [ "street_number" ]
                },{
                   "long_name" : "Yonge Street","short_name" : "Yonge St","types" : [ "route" ]
                },{
                   "long_name" : "Willowdale","short_name" : "Willowdale","types" : [ "neighborhood","political" ]
                },{
                   "long_name" : "North York","short_name" : "North York","types" : [ "political","sublocality","sublocality_level_1" ]
                },{
                   "long_name" : "Toronto","short_name" : "Toronto","types" : [ "locality",{
                   "long_name" : "Toronto Division","short_name" : "Toronto Division","types" : [ "administrative_area_level_2",{
                   "long_name" : "Ontario","short_name" : "ON","types" : [ "administrative_area_level_1",{
                   "long_name" : "Canada","short_name" : "CA","types" : [ "country",{
                   "long_name" : "M2N 5S3","short_name" : "M2N 5S3","types" : [ "postal_code" ]
                }
             ]
            }
       ],"status" : "OK"
}

谢谢您的帮助.

解决方法

$..address_components[?(@.types[0] == 'country')].long_name

打破它：

> $.. address_components：专注于address_components数组
> [？(@.types [0] ==’country’)]：找到address_components子文档,该文档具有名为“type”的类型属性,其中包含第一个值为“country”的数组
> .long_name：返回此子文档的long_name属性.

使用Jayway JsonPath Evaluator和Java验证：

JSONArray country = JsonPath.parse(json)
    .read("$..address_components[?(@.types[0] == 'country')].long_name");

// prints Canada
System.out.println(country.get(0));

（编辑：安卓应用网）

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