当json中的key值为数字时,怎么用GSON解析?

来源:互联网 发布:网络推广文案案例 编辑:程序博客网 时间:2024/05/16 11:51

一般json中的key值都是固定的,但如果key值为数字序列时应该怎么办呢?如下

{ "0": { "count":"5"},  "1": { "title":"...", "desc":"" },  "2": { "title":"...", "desc":"" },  "3": { "title":"...", "desc":"" },  "4": { "title":"...", "desc":"" },  "5": { "title":"...", "desc":"" },  "routes": { "route1":"...", "route3":"" },}

在这里,最常用的方法是将这段json解析为Map结构:

import java.io.FileReader;import java.lang.reflect.Type;import java.util.Map;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;public class GsonFoo{  public static void main(String[] args) throws Exception  {    Gson gson = new Gson();    Type mapType = new TypeToken<Map<String,Map<String, String>>>() {}.getType();    Map<String,Map<String, String>> map = gson.fromJson(new FileReader("input.json"), mapType);    System.out.println(map);    // Get the count...    int count = Integer.parseInt(map.get("0").get("count"));    // Get each numbered entry...    for (int i = 1; i <= count; i++)    {      System.out.println("Entry " + i + ":");      Map<String, String> numberedEntry = map.get(String.valueOf(i));      for (String key : numberedEntry.keySet())        System.out.printf("key=%s, value=%s\n", key, numberedEntry.get(key));    }    // Get the routes...    Map<String, String> routes = map.get("routes");    // Get each route...    System.out.println("Routes:");    for (String key : routes.keySet())      System.out.printf("key=%s, value=%s\n", key, routes.get(key));  }}

注意上面的 for循环 中,如果json中没有“count”那行怎么办呢?

可以先用 JSONObject 取出主要数据,用 i <= JSONObject.length 代替到 i <= count 处就可以了~

阅读全文
0 0
原创粉丝点击