json使用

本篇三种解析的对象为json数组

JsonObject

private void parseJSON(String result) {
  try {
    JSONArray jsonArray = new JSONArray(result);
    for (int i = 0; i <= jsonArray.length(); i++) {
      JSONObject obj = jsonArray.getJSONObject(i);

      String id = obj.optString("id");
      String name = obj.optString("name");
      String age = obj.optString("age");

      Log.d("jsonresult", id + "::" + name + "::" + age);
    }
  } catch (JSONException e) {
    e.printStackTrace();
  }
}

gson

这是Google提供的方法：​​gson2.3.1包下载包​​
只需先创建好javabean，然后一行fromJson传入即可

private void gsonParseJson(String result) {
  List<Person> persons= new ArrayList<Person>();
  Gson gson = new Gson();
  // Person persons= gson.fromJson(result, Person.class); // 针对非数组情况

  persons= gson.fromJson(result, new TypeToken<List<Person>>() {}.getType());
  for (Person person : persons) {
    String id = person.getId();
    String name = person.getName();
    String age = person.getAge();
    Log.d("jsonresult", id + "::" + name + "::" + age);
  }
}

fastjson

/**
 * fastjson
 *      example     compile 'com.alibaba:fastjson:1.2.38'
 *
 *      github      https://github.com/alibaba/fastjson
 */
public class JsonT {

    /**
     * object --> json
     */
    public static String toJson(Object obj) {

        if (null == obj)
            return "obj == null, plz check param obj";

        String json = JSON.toJSONString(obj);
        if (null != json && !"".equals(json)) {
            return json;
        } else {
            return "";
        }
    }


    /**
     * json --> object
     */
    public static <T> T toObj(String json, Class<T> clz) {

        if (null == json)
            throw new RuntimeException("return json is null");

        return JSON.parseObject(json, clz);
    }
}