Android从REST Web服务解析JSON

时间:2012-07-17 10:38:39

标签: android json web-services rest

我在http://susana.iovanalex.ro/esculap/ws2.php?key=abc&action=getpatientlist有一个REST Web服务,它返回类似于下面的JSON有效负载:

[{"id":"15","nume":"Suciu","prenume":"Monica","location":"Cardiologie, Salon 4, Pat 
   2","alarm_pulse_min":"60","alarm_pulse_max":"90","alarm_oxy_min":"90"},
 {"id":"101","nume":"Test Node","prenume":"Arduino","location":"UPT Electro, 
   B019","alarm_pulse_min":"50","alarm_pulse_max":"160","alarm_oxy_min":"93"},
 {"id":"160","nume":"Vasilescu","prenume":"Ion","location":"Cardiologie, Salon 4, Pat 
   2","alarm_pulse_min":"60","alarm_pulse_max":"120","alarm_oxy_min":"80"},
  {"id":"161","nume":"Lungescu","prenume":"Simion","location":"Pneumologie, Salon 5, Pat 
   5","alarm_pulse_min":"70","alarm_pulse_max":"110","alarm_oxy_min":"95"},
 {"id":"162","nume":"Paunescu","prenume":"Ramona","location":"Cardiologie, Salon 4, Pat 
   2","alarm_pulse_min":"0","alarm_pulse_max":"0","alarm_oxy_min":"0"}]

在遵循http://www.androidcompetencycenter.com/2009/10/json-parsing-in-android/的教程时使用Android的解析器时,我想在ArrayList中返回已处理的数据。

我经常收到以下错误:

 org.json.JSONException: Value [{"prenume":"Monica", ... "nume":"Paunescu"}] of type         
 org.json.JSONArray cannot be converted to JSONObject.

你能不能给我一个代码片段或指针,我在哪里可以找到更多信息?

5 个答案:

答案 0 :(得分:3)

你的整个Json是一个JSONArray的JSONObjects。

你试图获得一个JSON对象,即:

 JSONObject jObject = new JSONObject("[{"prenume":"Monica", ... "nume":"Paunescu"}]");

但那是一个数组!

尝试:

 JSONArray jArray = new JSONArray("[{"prenume":"Monica", ... "nume":"Paunescu"}]");

 for(int i=0; i < jArray.length(); i++){
      JSONObject jObject = jArray.getJSONObject(i);
      String prenume = jObject.getString("prenume");
      Log.i("TAG", "Prenume is: "+ prenume);
 }

这一切都在这里解释:http://www.json.org/http://www.json.org/java/

答案 1 :(得分:1)

请参阅此处http://www.json.org/您的网络服务包含json数组,而不是json对象,因此解析为:

JSONArray JSONArrays = new JSONArray(jString); 

for(int n = 0; n < JSONArrays.length(); n++)
{
    JSONObject object = JSONArrays.getJSONObject(n);
    // do some stuff....
}

答案 2 :(得分:1)

最好的办法是使用GSON解析您收到的JSONAray字符串作为输出。这有助于您将数据作为真实对象进行管理,而不是字符串。

请查看以下帖子来解析您的JSON数组

How to Parse JSON Array in Android with Gson

您唯一需要做的就是使用JSON输出中的参数名称创建Classes

答案 3 :(得分:0)

您可以参考此链接

https://stackoverflow.com/a/11446076/1441666

{
"result": "success",
"countryCodeList":
[
  {"countryCode":"00","countryName":"World Wide"},
  {"countryCode":"kr","countryName":"Korea"}
] 
}

以下是我提取国家/地区详情

JSONObject json = new JSONObject(jsonstring);
JSONArray nameArray = json.names();
JSONArray valArray = json.toJSONArray(nameArray);

JSONArray valArray1 = valArray.getJSONArray(1);

valArray1.toString().replace("[", "");
valArray1.toString().replace("]", "");

int len = valArray1.length();

for (int i = 0; i < valArray1.length(); i++) {

 Country country = new Country();
 JSONObject arr = valArray1.getJSONObject(i);
 country.setCountryCode(arr.getString("countryCode"));                        
 country.setCountryName(arr.getString("countryName"));
 arrCountries.add(country);
}

答案 4 :(得分:0)

我认为你应该更好地使用一个可以处理REST请求和对象序列化/反序列化的库。 看看Push Messages using REST api in android