我有这个 JSON:
request_time: "2018-03-13T00:59:44+00:00",
stops: [
{
atcocode: "370023715",
mode: "bus",
name: "AG1",
stop_name: "AG1",
smscode: "37023715",
bearing: "N",
locality: "Sheffield Centre",
indicator: "AG1",
longitude: -1.46616,
latitude: 53.38248,
distance: 57
},
{
atcocode: "370027281",
mode: "bus",
name: "AG12",
stop_name: "AG12",
smscode: "37027281",
bearing: "N",
locality: "Sheffield Centre",
indicator: "AG12",
longitude: -1.46583,
latitude: 53.38228,
distance: 77
}
]
}
我想检索并存储此子树中的每个位置和 atocode 的数组。我目前有这个 java 代码，但它只显示子树中的所有内容:
JsonParser parser = new JsonParser();
JsonElement element = parser.parse(json);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
if (element.isJsonObject()){
JsonObject bus = element.getAsJsonObject();
JsonArray array = bus.getAsJsonArray("stops");
for (int i = 0; i < array.size(); i++){
out.println(array.get(i));
}
最佳答案
因此，只需在每个 "stops" 数组元素上使用 JsonObject 的 get 方法即可:
public static void main(String[] args) {
String json = "{request_time: \"2018-03-13T00:59:44+00:00\",\n" + "stops: [\n" + "{\n"
+ "atcocode: \"370023715\",\n" + "mode: \"bus\",\n" + "name: \"AG1\",\n"
+ "stop_name: \"AG1\",\n" + "smscode: \"37023715\",\n" + "bearing: \"N\",\n"
+ "locality: \"Sheffield Centre\",\n" + "indicator: \"AG1\",\n" + "longitude: -1.46616,\n"
+ "latitude: 53.38248,\n" + "distance: 57\n" + "},\n" + "{\n" + "atcocode: \"370027281\",\n"
+ "mode: \"bus\",\n" + "name: \"AG12\",\n" + "stop_name: \"AG12\",\n"
+ "smscode: \"37027281\",\n" + "bearing: \"N\",\n" + "locality: \"Sheffield Centre\",\n"
+ "indicator: \"AG12\",\n" + "longitude: -1.46583,\n" + "latitude: 53.38228,\n"
+ "distance: 77\n" + "}\n" + "]\n" + "}";
JsonParser parser = new JsonParser();
JsonElement element = parser.parse(json);
if (element.isJsonObject()) {
JsonObject bus = element.getAsJsonObject();
JsonArray array = bus.getAsJsonArray("stops");
for (int i = 0; i < array.size(); i++) {
System.out.println(((JsonObject) array.get(i)).get("locality"));
System.out.println(((JsonObject) array.get(i)).get("atcocode"));
}
}
}
输出:
"Sheffield Centre"
"370023715"
"Sheffield Centre"
"370027281"
附注我不提供如何将它们存储在数组中的代码，因为不清楚您要如何存储它，您想要多少个数组......
关于Java Gson - 从 JSON 树获取特定值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49246758/