[英]How to parse JSONArray which is in another JSONArray
I am trying to parse a JSONObject.我正在尝试解析 JSONObject。 This JSONObject has a JSONArray in it, and it has another JSONArray inside of JSONArray.
这个 JSONObject 中有一个 JSONArray,它在 JSONArray 中还有另一个 JSONArray。 The json form that I am trying to parse is as below.
我试图解析的 json 形式如下。
{
"phone":"01029093199",
"store_id":"1",
"orders":[
{
"menu_id":"4",
"menu_defaultprice":"1500",
"extraorders":[
{
"extra_id":"1",
"extra_price":"0",
"extra_count":"1"
},
{
"extra_id":"38",
"extra_price":"300",
"extra_count":"2"
}
]
},
{
"menu_id":"4",
"menu_defaultprice":"1500",
"extraorders":[
{
"extra_id":"2",
"extra_price":"0",
"extra_count":"1"
},
{
"extra_id":"19",
"extra_price":"500",
"extra_count":"1"
}
]
},
{
"menu_id":"6",
"menu_defaultprice":"2000",
"extraorders":[
{
"extra_id":"6",
"extra_price":"0",
"extra_count":"1"
},
{
"extra_id":"21",
"extra_price":"500",
"extra_count":"1"
},
{
"extra_id":"41",
"extra_price":"300",
"extra_count":"1"
}
]
}
]
}
The code below is what I have tried before.下面的代码是我之前尝试过的。
@RestController
public class OrderApiController {
private OrderService orderService;
public void setOrderService(OrderService orderService) {
this.orderService = orderService;
}
@PostMapping("/OrderInsert.do")
public void insertOrder(@RequestBody JSONObject jsonObject) {
JSONParser jsonParser = new JSONParser();
System.out.println(jsonObject);
System.out.println(jsonObject.get("phone")); // phone 가져오기 성공
System.out.println(jsonObject.get("store_id")); // store_id 가져오기 성공
System.out.println("==========JSONArray Parsing start=========");
ArrayList<JSONArray> jsonArrayList = (ArrayList<JSONArray>)jsonObject.get("orders");
for(int i = 0; i < jsonArrayList.size(); i++) {
System.out.println(jsonArrayList.get(i)); // SUCCESS
String temp = jsonArrayList.get(i).toJSONString(); // WHERE ERROR HAPPENS
System.out.println(temp);
// Tried below code to remove "[", "]" from JSONArray, but not working.
// Error message was same as the message shown from line 37.
//String jsonString = temp.substring(1, temp.length()-1);
//System.out.println(jsonString);
// org.json.JSONObject jTemp = new org.json.JSONObject(jsonArrayList.get(i));
// System.out.println(jTemp); --> prints {} (empty JSONObject)
// System.out.println("menu_id : " + jTemp.getInt("menu_id")); // Not Working
}
}
}
The error shown is..显示的错误是..
java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to org.json.simple.JSONArray
Additionally, I am using this json module dependency.此外,我正在使用这个 json 模块依赖项。
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20200518</version>
</dependency>
I knew that if I print something on console using System.out.println(OBJECT)
, the OBJECT's toString()
method is called.我知道如果我使用
System.out.println(OBJECT)
在控制台上打印一些东西,就会调用 OBJECT 的toString()
方法。 So I tried to call toString()
, and that gave me the ClassCastException exception.所以我尝试调用
toString()
,这给了我 ClassCastException 异常。
Error is in fact at ArrayList<JSONArray> jsonArrayList = (ArrayList<JSONArray>)jsonObject.get("orders");
错误实际上是在
ArrayList<JSONArray> jsonArrayList = (ArrayList<JSONArray>)jsonObject.get("orders");
Instead of casting JSONArray
to ArrayList
, you can traverse JSONArray
and read its attributes.您可以遍历
JSONArray
并读取其属性,而不是将JSONArray
转换为ArrayList
。 Your code can be changed something like.您的代码可以更改为。
@PostMapping("/OrderInsert.do")
public void insertOrder(@RequestBody JSONObject jsonObject) {
System.out.println(jsonObject);
System.out.println(jsonObject.get("phone")); // phone 가져오기 성공
System.out.println(jsonObject.get("store_id")); // store_id 가져오기 성공
System.out.println("==========JSONArray Parsing start=========");
JSONArray orders = jsonObject.getJSONArray("orders");
for(int i = 0; i < orders.length(); i++) {
System.out.println(orders.get(i)); // SUCCESS
String temp = orders.get(i).toString();
System.out.println(temp);
// Travserse further json
JSONObject order = orders.getJSONObject(i);
System.out.println(order.get("menu_defaultprice"));
System.out.println(order.get("menu_id"));
JSONArray extraorders = order.getJSONArray("extraorders");
for(int j = 0; j < extraorders.length(); j++) {
JSONObject extraOrder = extraorders.getJSONObject(j);
System.out.println(extraOrder.get("extra_id"));
System.out.println(extraOrder.get("extra_price"));
System.out.println(extraOrder.get("extra_count"));
}
}
}
You are incorrectly fetching the orders
.您错误地获取
orders
。 It should be stored in JSONArray, and NOT ArrayList它应该存储在 JSONArray 中,而不是 ArrayList
Replace :替换:
ArrayList<JSONArray> jsonArrayList = (ArrayList<JSONArray>)jsonObject.get("orders");
With :与:
JSONArray jsonArrayList = jsonObject.getJSONArray("orders");
Now, you can iterate JSONArray like this现在,您可以像这样迭代 JSONArray
for(int i = 0; i < jsonArrayList.length(); i++) {
System.out.println(jsonArrayList.get(i)); // SUCCESS
String temp = jsonArrayList.get(i).toJSONString();
System.out.println(temp);
}
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