如何在 JSONObject/Array 查找中查找值

Question

下面是 JSON 供稿：

    {
"list" : { 
"meta" : { 
"type" : "resource-list",
"start" : 0,
"count" : 2
},
"resources" : [ 
{
"resource" : { 
"classname" : "Quote",
"fields" : { 
"name" : "USD/KRW",
"price" : "1151.295044",
"symbol" : "KRW=X",
"ts" : "1437357550",
"type" : "currency",
"utctime" : "2015-07-20T01:59:10+0000",
"volume" : "0"
}
}
}
,
{
"resource" : { 
"classname" : "Quote",
"fields" : { 
"name" : "SILVER 1 OZ 999 NY",
"price" : "0.067476",
"symbol" : "XAG=X",
"ts" : "1437169614",
"type" : "currency",
"utctime" : "2015-07-17T21:46:54+0000",
"volume" : "62"
}
}
}
,
{
"resource" : { 
"classname" : "Quote",
"fields" : { 
"name" : "USD/VND",
"price" : "21815.500000",
"symbol" : "VND=X",
"ts" : "1437357540",
"type" : "currency",
"utctime" : "2015-07-20T01:59:00+0000",
"volume" : "0"
}
}
}

]
}
}

例如，我如何找到 JSON 对象的 "price"，其符号是 ("symbol" : "XAG=X")。在这种情况下，答案是 ("price" : "0.067476")。我需要以编程方式执行此查找，因为 JSON 比此处显示的大得多，并且给我的唯一参数将是 "symbol"。

这可能吗？非常感谢有关如何执行此操作的任何详细帮助。

Answer 1

假设内容表示 json 字符串

import org.json.JSONArray;
import org.json.JSONObject;

JSONObject list = new JSONObject(content).getJSONObject("list");
JSONArray resources = list.getJSONArray("resources");
for (int j = 0; j < resources.length(); j++) {
    JSONObject resource =     resources.getJSONObject(j).getJSONObject("resource");
    JSONObject fields = resource.getJSONObject("fields");
    System.out.println(fields.get("symbol"));
    System.out.println(fields.get("price"));
}

Answer 2

这是您的Json对象格式

试试这个以获得正确的结果 -

JSONObject list = new JSONObject(content).getJSONObject("list");
JSONArray resources = list.getJSONArray("resources");
for (int j = 0; j < resources.length(); j++) {
  JSONObject resource = resources.getJSONObject(j).getJSONObject("resource");
  JSONObject fields = resource.getJSONObject("fields");
    if(fields.getString("symbol").equals("XAG=X")){
       System.out.println("Price of symbol(XAG=X) is"+ fields.getString("price"));
    }    
}

如何在 JSONObject/Array 查找中查找值

How to find a value within a JSONObject/Array Lookup

java

android

json

jsonobject