我试图使用URL检索Json数据。我的Json数组张贴在下面。我得到一个类型不匹配json异常。有谁能一步一步地指引我，我在哪里走错了?我的错误日志贴在下面。
其次，请告诉我使用url的json解析是否与使用服务器数据库中的php的json解析相同。
Url: http://166.62.17.208/json_preferencess.aspx
"items": [
{
"id": "11",
"Item_Id": "123",
"Item_Name": "Chicken Cream Soup",
"Price": "8",
"Currency": "AED",
"Category": "Soup",
"Description": "Creamy Chicken Soup with garnish & side helpings",
"Unit": "2",
"food_type": "Non",
"Image_Large": "/images_large/chickensoup.jpg",
"Image_Thumb": "/images_large/chickensoup.jpg",
"Timestamp": "6/23/2014 9:49:43 PM",
"Promotion": "",
"Item_Name_arabic": "حساء الطماطم",
"Item_Name_russian": "",
"Currency_arabic": "درهم",
"Currency_russian": "",
"Description_arabic": "حساء الطماطم",
"Description_russian": "",
"Note": "",
"Nutritional_info": "",
"extrafield_1": "",
"extrafield_2": "",
"preferncess": [
"No Salt",
"Extra Sugar"
],
"preferncess_ids": [
"1",
"2"
],
"price": [
"4",
"5"
],
"preferncess_arabic": [
"لا الملح",
"سكر اضافية"
]
}
],
"category_Timestamp": "6/24/2014 1:05:28 PM",
"questions": [
{
"q_id": "1",
"q_question": "How would you rate our Menu ?",
"q_option1": "Excellent",
"q_option2": "Very Good",
"q_option3": "Good",
"q_option4": "Bad",
"q_option5": "Terrible",
"Timestamp": "9/12/2013 3:31:55 PM",
"q_status": "1"
},
],
MainActivity.class
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
//items = jsonObj.getJSONArray(TAG_CONTACTS);
Log.i("json node",""+jsonObj);
// looping through All Contacts
for (int i = 0; i < items.length(); i++) {
JSONObject c = items.getJSONObject(i);
String id = c.getString("id");
}
}
06-27 06:55:50.154: W/System.err(2192): org.json.JSONException: Value [{"questions":[{"q_id":"1","q_question":"How would you rate our Menu ?","q_status":"1","q_option5":"Terrible","q_option3":"Good","q_option4":"Bad","q_option2":"Very Good","q_option1":"Excellent","Timestamp":"9/12/2013 3:31:55 PM"},{"q_id":"2","q_question":"How would you rate our presentation, taste and quality of food ?","q_status":"1","q_option5":"Terrible","q_option3":"Good","q_option4":"Bad","q_option2":"Very Good","q_option1":"Excellent","Timestamp":"9/12/2013 3:31:55 PM"},{"q_id":"3","q_question":"How would you rate the friendliness our staff members ?","q_status":"1","q_option5":"Terrible","q_option3":"Good","q_option4":"Bad","q_option2":"Very Good","q_option1":"Excellent","Timestamp":"9/12/2013 3:31:55 PM"},{"q_id":"4","q_question":"How would you rate our staff's performance and service?","q_status":"1","q_option5":"Terrible","q_option3":"Good","q_option4":"Bad","q_option2":"Very Good","q_option1":"Excellent","Timestamp":"9/12/2013 3:31:55 PM"},{"q_id":"5","q_question":"How would you rate the value for money ?","q_status":"1","q_option5":"Terrible","q_option3":"Good","q_option4":"Bad","q_option2":"Very Good","q_option1":"Excellent","Timestamp":"9/12/2013 3:31:55 PM"}],"categories":[{"categoryArabicName":"سلطة خضراء","catid":"0","categoryShortName":"Salads","categoryName":"Salads"},{"categoryArabicName":"المزة","catid":"1","categoryShortName":"Mezzah","categoryName":"Mezzah"},{"categoryArabicName":"الطبق الرئيسي","catid":"2","categoryShortName":"Main-Course","categoryName":"Main Course"},{"categoryArabicName":"معكرونة","catid":"3","categoryShortName":"Pasta","categoryName":"Pasta"},{"categoryArabicName":"مثوبة","catid":"4","categoryShortName":"Deserts","categoryName":"Deserts"},{"categoryArabicName":"حساء","catid":"5","categoryShortName":"Soup","categoryName":"Soup"}],"question_Timestamp":"9/12/2013 3:31:55 PM","items":[{"Image_Large":"/images_large/chickensoup.jpg","Promotion":"","food_type":"Non","Item_Name":"Chicken Cream Soup","Unit":"2","id":"11","Nutritional_info":"","Description_arabic":"حساء الطماطم","Image_Thumb":"/images_large/chickensoup.jpg","preferncess":["No Salt","Extra Sugar"],"extrafield_1":"","extrafield_2":"","Currency":"AED","Description_russian":"","Description":"Creamy Chicken Soup with garnish & side helpings","preferncess_ids":["1","2"],"Item_Name_russian":"","Currency_russian":"","Note":"","Item_Id":"123","preferncess_arabic":["لا الملح","سكر اضافية"],"Timestamp":"6/23/2014 9:49:43 PM","Category":"Soup","price":["4","5"],"Currency_arabic":"درهم","Price":"8","Item_Name_arabic":"حساء الطماطم"},{"Image_Large":"/images_large/pasta.jpg","Promotion":"","food_type":"Non","Item_Name":"Pasta Napolitan","Unit":"20","id":"12","Nutritional_info":"","Description_arabic":"حساء الطماطم","Image_Thumb":"/images_large/pasta.jpg","preferncess":["No Salt"],"extrafield_1":"","extrafield_2":"","Currency":"AED","Description_russian":"","Description":"Pasta in Napolitan Sauce","preferncess_ids":["3"],"Item_Name_russian":"","Currency_russian":"","Note":"","Item_Id":"501","preferncess_arabic":["لا الملح"],"Timestamp":"6/23/2014 9:47:45 PM","Category":"Pasta","price":["5"],"Currency_arabic":"درهم","Price":"18","Item_Name_arabic":"حساء الطماطم"},{"Image_Large":"/images_large/caeser-salad.jpg","Promotion":"","food_type":"Non","Item_Name":"Caeser Salad","Unit":"20","id":"13","Nutritional_info":"","Description_arabic":"حساء الطماطم حساء الطماطم حساء الطماطم حساء الطماطمحساء الطماطم","Image_Thumb":"/images_large/caeser-salad.jpg","preferncess":["No Salt","Extra Pepper"],"extrafield_1":"","extrafield_2":"","Currency":"AED","Description_russian":"","Description":"A Caesar salad is a salad of romaine lettuce and croutons dressed with Parmesan cheese.","preferncess_ids":["4","8"],"Item_Name_russian":"","Currency_russian":"","Note":"","Item_Id":"1001","preferncess_arab
W/System.err(2122): at org.json.JSON.typeMismatch(JSON.java:111)
W/System.err(2122): at org.json.JSONObject.<init>(JSONObject.java:159)
W/System.err(2122): at org.json.JSONObject.<init>(JSONObject.java:172)
W/System.err(2122): at info.androidhive.jsonparsing.MainActivity$GetContacts.doInBackground(MainActivity.java:118)
W/System.err(2122): at info.androidhive.jsonparsing.MainActivity$GetContacts.doInBackground(MainActivity.java:1)
W/System.err(2122): at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err(2122): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err(2122): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err(2122): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err(2122): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err(2122): at java.lang.Thread.run(Thread.java:841)
首先你的数据以数组形式来自服务器，你试图将数据转换成json对象。
现在试试下面的方法:-
JSONArray obj = new JSONArray(jsonStr);
JSONObject obj = jsonObj.getJSONObject(0);
items = jsonObj.getJSONArray("items");
for (int i = 0; i < items.length(); i++)
{
JSONObject c = items.getJSONObject(i);
String id = c.getString("id");
}
我认为你没有得到项目数组，这就是为什么你得到错误。
在强制转换
之前尝试像下面这样检查类型if (c.get(key) instanceof String)
{
JSONObject Lawset = c.getString(key);
} else if (c.get(key) instanceof JSONObject)
{
JSONObject Lawset = c.getJSONObject(key);
//try to retrieve data from json object
}
else if (c.get(key) instanceof JSONArray)
{
JSONArray Lawset = c.getJSONArray(key);
//iterate to get data
}
试试这个方法，希望能帮助你解决你的问题
String jsonStr = "{"items":[{"id":"11","Item_Id":"123","Item_Name":"Chicken Cream Soup","Price":"8","Currency":"AED","Category":"Soup","Description":"Creamy Chicken Soup with garnish & side helpings","Unit":"2","food_type":"Non","Image_Large":"/images_large/chickensoup.jpg","Image_Thumb":"/images_large/chickensoup.jpg","Timestamp":"6/23/2014 9:49:43 PM","Promotion":"","Item_Name_arabic":"حساء الطماطم","Item_Name_russian":"","Currency_arabic":"درهم","Currency_russian":"","Description_arabic":"حساء الطماطم","Description_russian":"","Note":"","Nutritional_info":"","extrafield_1":"","extrafield_2":"","preferncess":["No Salt","Extra Sugar"],"preferncess_ids":["1","2"],"price":["4","5"],"preferncess_arabic":["لا الملح","سكر اضافية"]}],"category_Timestamp":"6/24/2014 1:05:28 PM","questions":[{"q_id":"1","q_question":"How would you rate our Menu ?","q_option1":"Excellent","q_option2":"Very Good","q_option3":"Good","q_option4":"Bad","q_option5":"Terrible","Timestamp":"9/12/2013 3:31:55 PM","q_status":"1"}]}";
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
JSONArray items = jsonObj.getJSONArray("items");
for (int i = 0; i < items.length(); i++) {
System.out.println(i + 1 + " Id :" + items.getJSONObject(i).getString("id"));
System.out.println(i + 1 + " Item Id :" + items.getJSONObject(i).getString("Item_Id"));
System.out.println(i + 1 + " Item Name :" + items.getJSONObject(i).getString("Item_Name"));
System.out.println(i + 1 + " Currency :" + items.getJSONObject(i).getString("Currency"));
System.out.println(i + 1 + " Category :" + items.getJSONObject(i).getString("Category"));
System.out.println(i + 1 + " Description :" + items.getJSONObject(i).getString("Description"));
System.out.println(i + 1 + " Unit :" + items.getJSONObject(i).getString("Unit"));
System.out.println(i + 1 + " Food Type :" + items.getJSONObject(i).getString("food_type"));
System.out.println(i + 1 + " Image Large :" + items.getJSONObject(i).getString("Image_Large"));
System.out.println(i + 1 + " Image Thumb :" + items.getJSONObject(i).getString("Image_Thumb"));
System.out.println(i + 1 + " Timestamp :" + items.getJSONObject(i).getString("Timestamp"));
System.out.println(i + 1 + " Promotion :" + items.getJSONObject(i).getString("Promotion"));
System.out.println(i + 1 + " Item Name Arabic :" + items.getJSONObject(i).getString("Item_Name_arabic"));
System.out.println(i + 1 + " Item Name Russian :" + items.getJSONObject(i).getString("Item_Name_russian"));
System.out.println(i + 1 + " Currency Arabic :" + items.getJSONObject(i).getString("Currency_arabic"));
System.out.println(i + 1 + " Currency Russian :" + items.getJSONObject(i).getString("Currency_russian"));
System.out.println(i + 1 + " Description Arabic :" + items.getJSONObject(i).getString("Description_arabic"));
System.out.println(i + 1 + " Description Russian :" + items.getJSONObject(i).getString("Description_russian"));
System.out.println(i + 1 + " Note :" + items.getJSONObject(i).getString("Note"));
System.out.println(i + 1 + " Nutritional Info :" + items.getJSONObject(i).getString("Nutritional_info"));
System.out.println(i + 1 + " Extrafield_1 :" + items.getJSONObject(i).getString("extrafield_1"));
System.out.println(i + 1 + " Extrafield_2 :" + items.getJSONObject(i).getString("extrafield_2"));
JSONArray preferncess = items.getJSONObject(i).getJSONArray("preferncess");
for (int j = 0; j < preferncess.length(); j++) {
System.out.println("Preferncess " + j + 1 + ":" + preferncess.getString(j));
}
JSONArray preferncess_ids = items.getJSONObject(i).getJSONArray("preferncess_ids");
for (int j = 0; j < preferncess_ids.length(); j++) {
System.out.println("Preferncess IDs " + j + 1 + ":" + preferncess_ids.getString(j));
}
JSONArray price = items.getJSONObject(i).getJSONArray("price");
for (int j = 0; j < price.length(); j++) {
System.out.println("Price" + j + 1 + ":" + price.getString(j));
}
JSONArray preferncess_arabic = items.getJSONObject(i).getJSONArray("preferncess_arabic");
for (int j = 0; j < preferncess_arabic.length(); j++) {
System.out.println("Preferncess Arabic" + j + 1 + ":" + preferncess_arabic.getString(j));
}
System.out.println("Category TimeStamp :" + jsonObj.getString("category_Timestamp"));
JSONArray questions = jsonObj.getJSONArray("questions");
for (int k = 0; k < questions.length(); k++) {
System.out.println(i + 1 + " Question Id :" + questions.getJSONObject(k).getString("q_id"));
System.out.println(i + 1 + " Question :" + questions.getJSONObject(k).getString("q_question"));
System.out.println(i + 1 + " Question Option 1 :" + questions.getJSONObject(k).getString("q_option1"));
System.out.println(i + 1 + " Question Option 2 :" + questions.getJSONObject(k).getString("q_option2"));
System.out.println(i + 1 + " Question Option 3 :" + questions.getJSONObject(k).getString("q_option3"));
System.out.println(i + 1 + " Question Option 4 :" + questions.getJSONObject(k).getString("q_option4"));
System.out.println(i + 1 + " Question Option 5 :" + questions.getJSONObject(k).getString("q_option5"));
System.out.println(i + 1 + " Question Timestamp :" + questions.getJSONObject(k).getString("Timestamp"));
System.out.println(i + 1 + " Question Status :" + questions.getJSONObject(k).getString("q_status"));
}
}
}catch (Throwable e){
e.printStackTrace();
}
}