List＜String＞和JsonString的相互转换

<String>转JsonString：

List<String> strList = new ArrayList<>();

法1：String str = (strList);

        str 存入的格式为：["xx1","xx2"]

法2：String str2 = strList .stream().collect((","));

        str2存入格式为: "xx1,xx2"

2.JsonString转List<String>

String str = ["xx1","xx2"];

List<String> strList = (str, );