从 URL 中提取查询值 [英] Extract query value from URL
问题描述
我有以下网址:https://play.google.com/store/apps/details?id=eu.bandainamcoent.verylittlenightmares&hl=en";
我想提取这个值:eu.bandainamcoent.verylittlenightmares
URI uri = new URI(URL);
uri.getQuery();
我会得到这个:id=eu.bandainamcoent.verylittlenightmares&hl=en
如何截取id=
和&hl=en
?而 &hl=en
可能不存在并且可以不同,例如 &hl=de
等.
How to cut id=
and &hl=en
?
And &hl=en
may not exist and can be different, like &hl=de
etc.
推荐答案
URI 中没有函数可以做到这一点,但这里有一个解决方案:
There are no function in URI to do this, but here is a trick to solve it:
Map<String, String> params = Arrays.stream(uri.getQuery().split("&"))
.map(s -> s.split("="))
.collect(Collectors.toMap(k -> k[0], v -> v.length > 1 ? v[1] : ""));
String id = params.get("id"); // eu.bandainamcoent.verylittlenightmares
String hl = params.get("hl"); // en
我们确定两个参数之间唯一的分隔符是&
,并且参数的名称和值由=
分隔,因此您用分隔>&
,并且对于每个结果用 =
分割,结果是一个 Map,其中包含参数名称作为键和值作为值.
We are sure that the only separator between two parameters is &
, and the parameter have a name and value separated by =
, for that you split with &
, and for each result split with =
, and the result is a Map which contain the param name as key and value as value.
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