我正在尝试解析多个json数组，其中包含嵌套的json arrys。我搜索了很多，但无法准确理解该怎么做。我已经完成了以下代码，但它没有给我所有的值。
到目前为止，我已完成此编码，result字符串显示items array，jArray显示questions array。我是json的新手，因此请一步一步帮助我。
String result = null;
InputStream is = null;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("url");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "connection success "+"nameValuePairs");
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection "+e.toString());
}
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,HTTP.UTF_8),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result=sb.toString();
Log.e("log_tag", "result "+result.toString());
}
catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
}
try
{
JSONArray jArray=new JSONArray(result);
Log.w("Lengh",""+jArray);
String s="",s1,s2,s3,s4,s5,s6,s7,s8,s9;
Log.w("Lengh",""+jArray.length());
for(int i=0;i<jArray.length();i++){
JSONArray newarr = jArray.getJSONObject(i).getJSONArray("items");
Log.w("Lengh",""+newarr.length());
for(int j= 0; j<newarr.length();j++){
JSONObject json_data = newarr.getJSONObject(i);
s=json_data.getString("id");
Log.w("parsed data",""+s);
// System.out.println("Id is: "+ s);
}
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
}
Json Array
[
{
"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"
]
},
{
"id": "12",
"Item_Id": "501",
"Item_Name": "Pasta Napolitan",
"Price": "18",
"Currency": "AED",
"Category": "Pasta",
"Description": "Pasta in Napolitan Sauce",
"Unit": "20",
"food_type": "Non",
"Image_Large": "/images_large/pasta.jpg",
"Image_Thumb": "/images_large/pasta.jpg",
"Timestamp": "6/23/2014 9:47:45 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"
],
"preferncess_ids": [
"3"
],
"price": [
"5"
],
"preferncess_arabic": [
"لا الملح"
]
},
/* values till id =25 are present */
],
"categories": [
{
"categoryName": "Salads",
"categoryShortName": "Salads",
"catid": "0",
"categoryArabicName": "سلطة خضراء"
},
{
"categoryName": "Mezzah",
"categoryShortName": "Mezzah",
"catid": "1",
"categoryArabicName": "المزة"
},
/* some more values present */
"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"
},
{
"q_id": "2",
"q_question": "How would you rate our presentation, taste and quality of food ?",
"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"
},
/* some more values present */
}
]
答案 0 :(得分：1)
这是你的hierarcy json数据
[
{
"items":+[15],
"categories":+[6],
"category_Timestamp":"6/24/2014 1:05:28 PM",
"questions":+[5],
"question_Timestamp":"9/12/2013 3:31:55 PM"
}
]
here is the code to parse entire data create Core Objects of items and categories and questions as you like..
//for parsing the given json data
private void parseEntireData(String url) throws JSONException {
JSONArray jArray=new JSONArray(url);
String[] metaData={"items","categories","category_Timestamp","questions","question_Timestamp"};
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
switch(i){
case 0 : parseItems(json_data);break;
case 1 : parseCategories(json_data);break;
case 2: json_data.getString(metaData[i]);break;
case 3: parseQuestion(json_data); break;
case 4: json_data.getString(metaData[i]);break;
}
}
}
// for parsing question
private void parseQuestion(JSONObject json_data) throws JSONException {
JSONArray jArray=json_data.getJSONArray("question");
for(int i=0;i<jArray.length();i++){
// parse data...
String _id=json_data.getString("id");
//......
}
}
// for parsing categories
private void parseCategories(JSONObject json_data) throws JSONException {
JSONArray jArray=json_data.getJSONArray("categories");
for(int i=0;i<jArray.length();i++){
// parse data...
String _id=json_data.getString("categoryName");
//......
}
}
// for parsing items private void parseItems(JSONObject json_data) throws JSONException { JSONArray jArray=json_data.getJSONArray("items"); for(int i=0;i<jArray.length();i++){ // parse data... String _id=json_data.getString("q_id"); //...... } }
答案 1 :(得分：0)
从以下链接下载Gson Google Gson 2.2.4 jar
在你的libs文件夹中添加jar
为Json Response创建一个Object类。对于上面的响应，Objects类如下所示，
import java.util.List;
public class ResponeItem {
public List<Item> items;
public List<Category> categories;
public String category_Timestamp;
public List<Question> questions;
public String question_Timestamp;
public class Item {
public String id;
public String Item_Id;
public String Item_Name;
public String Price;
public String Currency;
public String Category;
public String Description;
public String Unit;
public String food_type;
public String Image_Large;
public String Image_Thumb;
public String Timestamp;
public String Promotion;
public String Item_Name_arabic;
public String Item_Name_russian;
public String Currency_arabic;
public String Currency_russian;
public String Description_arabic;
public String Description_russian;
public String Note;
public String Nutritional_info;
public String extrafield_1;
public String extrafield_2;
public List<String> preferncess;
public List<String> preferncess_ids;
public List<String> price;
public List<String> preferncess_arabic;
}
public class Category {
public String categoryName;
public String categoryShortName;
public String catid;
public String categoryArabicName;
}
public class Question {
public String q_id;
public String q_question;
public String q_option1;
public String q_option2;
public String q_option3;
public String q_option4;
public String q_option5;
public String Timestamp;
public String q_status;
}
}
复制项目中的上述课程
调用Webservice，如下所示
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import com.google.gson.Gson;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
public class ResponseActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(-Your layout id-)
//Initializations
new NetworkCallTask().execute("Your-Url");
}
class NetworkCallTask extends AsyncTask<String, Void, InputStream> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Show your progressbar or something..
}
@Override
protected InputStream doInBackground(String... url) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet getRequest = new HttpGet(url[0]);
try {
HttpResponse getResponse = client.execute(getRequest);
final int statusCode = getResponse.getStatusLine()
.getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
Log.w(getClass().getSimpleName(), "Error " + statusCode
+ " for URL " + url[0]);
return null;
}
HttpEntity getResponseEntity = getResponse.getEntity();
return getResponseEntity.getContent();
} catch (IOException e) {
getRequest.abort();
Log.w(getClass().getSimpleName(), "Error for URL " + url[0], e);
}
return null;
}
@Override
protected void onPostExecute(InputStream result) {
super.onPostExecute(result);
if (result != null) {
Gson gson = new Gson();
Reader reader = new InputStreamReader(result);
ResponeItem response = gson.fromJson(reader,
ResponeItem.class);
//You can access all the objects here
List<Item> items = response.items;
List<Category> categories = response.categories;
String category_Timestamp = response.category_Timestamp;
List<Question> questions = response.questions;
String question_Timestamp = response.question_Timestamp;
} else {
Log.e(getClass().getSimpleName(), "Server Error");
}
// Dissmiss your progressbar
}
}
}
答案 2 :(得分：0)
使用GSON Google图书馆进行JSON表示。您可以为每个JSON元素创建一个Java类，并将JSON字符串表示直接转换为Java对象，这非常简单。以下是反序列化类别列表字符串的示例snnipet：
public static CategoryModel[] deserializeCategoriesData(String jsonData) throws Exception {
try {
Log.d(LOGTAG, "Deserialize JSON for Category list");
return setUpGsonBuilder().fromJson(jsonData, CategoryModel[].class);
} catch (Exception e) {
Log.e(LOGTAG, "Error reading category json", e);
throw e;
}
}
以下是您的类别java类
的方式public class CategoryModel {
private String categoryName;
private String categoryShortName;
private int catid;
private String categoryArabicName;
public String getCategoryName() {
return categoryName;
}
public void setCategoryName(String categoryName) {
this.categoryName = categoryName;
}
public String getCategoryShortName() {
return categoryShortName;
}
public void setCategoryShortName(String categoryShortName) {
this.categoryShortName = categoryShortName;
}
public int getCatid() {
return catid;
}
public void setCatid(int catid) {
this.catid = catid;
}
public String getCategoryArabicName() {
return categoryArabicName;
}
public void setCategoryArabicName(String categoryArabicName) {
this.categoryArabicName = categoryArabicName;
}
}
当然，您可以将Java对象包含为另一个Java对象的成员。例如，在主json字符串中，Category必须是java对象的数组变量：
public class SampleModel {
private ItemModel[] items;
private CategoryModel[] categories;
private Date category_Timestamp;
private QuestionModel[] questions;
private Date question_Timestamp;
// All getters and setters
...
}