如何解析嵌套的JSON数组？
问题描述：
在我的应用程序中，我使用php web服务来获取json数据。 下面是一个被取出从Web服务的JSON数据：如何解析嵌套的JSON数组？
{
"question_data":[
{
"section":{
"section_id":"1",
"section_name":"\u0935\u0938\u094d\u0924\u0941\u0928\u093f\u0937\u094d\u0920 \u092a\u094d\u0930\u0936\u094d\u0928",
"no_of_que":"25",
"duration":"25"
},
"question_list":[
{
"question":{
"reference_id":"1",
"reference_name":"Fundamental",
"reference_desc":"",
"reference_image":null,
"created_by":null,
"created_on":null,
"modified_by":null,
"modified_on":null,
"display":"Y",
"question_id":"407",
"section_id":"1",
"question":"Flat blades are mainly used in \u2026\u2026.. Type.\t\r\n",
"question_mar":"\u2026\u2026\u2026 \u092a\u094d\u0930\u093f\u0902\u091f\u0930 \u092e\u0927\u094d\u092f\u0947 \u092e\u0941\u0916\u094d\u092f\u0924\u094d\u0935\u0947 \u092b\u094d\u0932\u0945\u091f \u092c\u0947\u0921 \u0909\u092a\u092f\u094b\u0917 \u0915\u0947\u0932\u0947\u0932\u093e \u0905\u0938\u0924\u094b.\t\t\t\r\n",
"question_hindi":"\r\n\t\r\n\t\t\r\n\t\t\t
……… \u092a\u094d\u0930\u093f\u0902\u091f\u0930 \u092e\u0927\u094d\u092f\u0947 \u092e\u0941\u0916\u094d\u092f\u0924\u094d\u0935\u0947 \u092b\u094d\u0932\u0945\u091f \u092c\u0947\u0921 \u0909\u092a\u092f\u094b\u0917 \u0915\u0947\u0932\u0947\u0932\u093e \u0905\u0938\u0924\u094b.<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n",
"question_image":null,
"option_id":"1498",
"exam_type":"main"
},
"option":[
{
"option_id":"1496",
"question_id":"407",
"option":"Xerox \t",
"option_image":null,
"display":"Y"
},
{
"option_id":"1497",
"question_id":"407",
"option":"photo\t",
"option_image":null,
"display":"Y"
},
{
"option_id":"1498",
"question_id":"407",
"option":"Plotter",
"option_image":null,
"display":"Y"
},
{
"option_id":"1499",
"question_id":"407",
"option":"DeskJet",
"option_image":null,
"display":"Y"
}
]
},
{
"question":{
"reference_id":"1",
"reference_name":"Fundamental",
"reference_desc":"",
"reference_image":null,
"created_by":null,
"created_on":null,
"modified_by":null,
"modified_on":null,
"display":"Y",
"question_id":"420",
"section_id":"1",
"question":"For protection of computer from virus \u2026\u2026\u2026.. Program should be used.\t\r\n",
"question_mar":"\u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930 \u0935\u093e\u092f\u0930\u0938 \u092a\u093e\u0938\u0942\u0928 \u0906\u092a\u0932\u094d\u092f\u093e \u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930\u091a\u093e \u092c\u091a\u093e\u0935 \u0915\u0930\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u0906\u092a\u0932\u094d\u092f\u093e \u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930\u0935\u0930 \u2026\u2026.. \u092a\u094d\u0930\u094b\u0917\u0945\u092e \u0972\u0915\u094d\u091f\u093f\u0935\u0947\u091f \u0915\u0930\u0942\u0928 \u0920\u0947\u0935\u093e\u0935\u093e.\t\t\t\r\n",
"question_hindi":"
\u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930 \u0935\u093e\u092f\u0930\u0938 \u092a\u093e\u0938\u0942\u0928 \u0906\u092a\u0932\u094d\u092f\u093e \u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930\u091a\u093e \u092c\u091a\u093e\u0935 \u0915\u0930\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u0906\u092a\u0932\u094d\u092f\u093e \u0915\u0949\u092e\u094d\u092a\u094d\u092f\u0941\u091f\u0930\u0935\u0930 …….. \u092a\u094d\u0930\u094b\u0917\u0945\u092e \u0972\u0915\u094d\u091f\u093f\u0935\u0947\u091f \u0915\u0930\u0942\u0928 \u0920\u0947\u0935\u093e\u0935\u093e. <\/p>\r\n",
"question_image":null,
"option_id":"1548",
"exam_type":"main"
},
"option":[
{
"option_id":"1548",
"question_id":"420",
"option":"Anti Virus\t",
"option_image":null,
"display":"Y"
},
{
"option_id":"1549",
"question_id":"420",
"option":"Word\t",
"option_image":null,
"display":"Y"
},
{
"option_id":"1550",
"question_id":"420",
"option":"Excel\t",
"option_image":null,
"display":"Y"
},
{
"option_id":"1551",
"question_id":"420",
"option":"Notepad",
"option_image":null,
"display":"Y"
}
]
}...........
现在，我想只有“question_id”，“问题”，“question_mar”，“question_hindi”和“选项”，“option_id”相应的json数组。
下面是我用来获取上述数据代码：
JSONObject mainObj = new JSONObject(sb.toString());
JSONArray question_data = mainObj.getJSONArray("question_data");
for (int i = 0; i < question_data.length(); i++) {
JSONObject elem = question_data.getJSONObject(i);
JSONArray questions = elem.getJSONArray("question_list");
for (int k = 0; k < questions.length(); k++) {
JSONObject queandopt = questions.getJSONObject(k);
JSONArray question_list = queandopt.getJSONArray("question");
for (int j = 0; j < question_list.length(); j++) {
JSONObject question = question_list.getJSONObject(j);
String question_id = question.getString("question_id");
String question_eng = question.getString("question");
String question_mar = question.getString("question_mar");
String question_hindi = question.getString("question_hindi");
}
JSONArray option_list = queandopt.getJSONArray("option");
for (int j = 0; j < option_list.length(); j++) {
JSONObject option = option_list.getJSONObject(j);
String option_id = option.getString("option_id");
String option_desc = option.getString("option");
}
}
}
我得到异常而取此为“org.json.JSONException” 如何解决这个问题？
请帮忙!!
答
尝试此，
try {
JSONObject mainObj = new JSONObject(sb.toString());
JSONArray question_data = null;
question_data = mainObj.getJSONArray("question_data");
for (int i = 0; i < question_data.length(); i++) {
JSONObject elem = question_data.getJSONObject(i);
JSONArray questions = elem.getJSONArray("question_list");
for (int k = 0; k < questions.length(); k++) {
JSONObject queandopt = questions.getJSONObject(k);
JSONObject question_obj=queandopt.getJSONObject("question");
String question_id_value = question_obj.getString("question_id");
String question_value = question_obj.getString("question");
String question_mar_value = question_obj.getString("question_mar");
String question_hindi_value = question_obj.getString("question_hindi");
Log.d("TAG","question_id_value"+question_id_value+"question_value"+question_value+"question_mar_value"+question_mar_value+"question_hindi_value"+question_hindi_value);
JSONArray option_list = queandopt.getJSONArray("option");
for (int j = 0; j < option_list.length(); j++) {
JSONObject option = option_list.getJSONObject(j);
String option_id = option.getString("option_id");
String option_desc = option.getString("option");
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
错误是这里.. JSONArray question_list = queandopt.getJSONArray（ “问题”）; “问题”是JsonObject不是Json数组 – Piyush
[JSON解析android]可能重复（http://*.com/questions/16882037/json-parsing-android） –
发布logcat异常.. – rafsanahmad007