java - JSON字符串到Java中的String数组

Question

JSONArray cities = json.getJSONArray("city");

使用上面的代码得到以下输出：

{
"id":"1",
"name":"London"
"country":"United Kingdom"
},

{
"id":"2",
"name":"Madrid"
"country":"Spain"
},

{"id":"3",
"name":"Paris"
"country":"France"
},

{
"id":"3",
"name":"Zurich"
"country":"Switzerland"
}

如何仅将 JSON 数组中的名称获取到字符串数组？

例如：String[] s ={"London","Madrid","Paris","Zurich"}

Answer 1

cities是 JSONObjects 的数组。遍历该 JSONObjects 数组，并"name"从每个对象中获取属性。请参阅@pb2q 的答案，其中代码已为您方便地编写。

Answer 2

// you should probably mention what json library you use in your question
String[] cities = new String[cities.length()];
for (int i = 0; i<cities.length(); i++) {
    cities[i] = cities.getJsonObject(i).getString("name");
}

Answer 3

循环JSONArray并拉出"name"字段。这与您的json.getJSONArray("city");调用类似，只是在循环中：

JSONArray cities = json.getJSONArray("city");
JSONObject city = null;
String[] s = new String[cities.length()];

for (int i = 0; i < cities.length(); i++)
{
    city = cities.getJsonObject(i);
    s[i] = city.get("name");
}

Answer 4

您可以尝试使用JsonPath 之类的库。

代码会是这样的：

String rawJsonString = ...;
List<String> cities = JsonPath.read(rawJsonString, "$.city.name");

Answer 5

使用 JsonPath http://code.google.com/p/json-path/

<dependency>
    <groupId>com.jayway.jsonpath</groupId>
    <artifactId>json-path</artifactId>
    <version>0.8.1</version>
</dependency>

您可以获得所有城市名称

String rawJsonString = "...";
List<String> cities = JsonPath.read(rawJsonString, "$.city[*].name");