如何遍历 JSON 对象？

Question

{
   "stocks":{
      "0":{
         "name":"Torn City Stock Exchange",
         "acronym":"TCSE",
         "director":"None",
         "current_price":10018.747,
         "market_cap":0,
         "total_shares":0,
         "available_shares":0,
         "forecast":"Average",
         "demand":"High"
      },
      "1":{
         "name":"Torn City and Shanghai Banking Corporation",
         "acronym":"TSBC",
         "director":"Mr. Gareth Davies",
         "current_price":529.863,
         "market_cap":4300246833486,
         "total_shares":8115771121,
         "available_shares":0,
         "forecast":"Average",
         "demand":"High",
         "benefit":{
            "requirement":4000000,
            "description":"Entitled to receive occasional dividends"
         }
      },
      "2":{
         "name":"Torn City Investment Banking",
         "acronym":"TCB",
         "director":"Mr. Paul Davies",
         "current_price":502.819,
         "market_cap":5771083717274,
         "total_shares":11477457529,
         "available_shares":1539811799,
         "forecast":"Average",
         "demand":"Average",
         "benefit":{
            "requirement":1500000,
            "description":"Entitled to receive improved interest rates"
         }
      }
}

如何使用键值对遍历所有项目？我想提取名称、首字母缩略词、总份额、available_shares 和需求。请帮忙！我正在使用 java 创建一个 android 应用程序，但我被困在这里。

Answer 1

IMO 这不是在 JSON 中包含对象列表的正确方法。如果可以，您应该将其更改为

{
  "stocks": [
    {
      "name": "Torn City Stock Exchange",
      "acronym": "TCSE",
      "director": "None",
      "current_price": 10018.747,
      "market_cap": 0,
      "total_shares": 0,
      "available_shares": 0,
      "forecast": "Average",
      "demand": "High"
    },
    {
      "name": "Torn City and Shanghai Banking Corporation",
      "acronym": "TSBC",
      "director": "Mr. Gareth Davies",
      "current_price": 529.863,
      "market_cap": 4300246833486,
      "total_shares": 8115771121,
      "available_shares": 0,
      "forecast": "Average",
      "demand": "High",
      "benefit": {
        "requirement": 4000000,
        "description": "Entitled to receive occasional dividends"
      }
    },
    {
      "name": "Torn City Investment Banking",
      "acronym": "TCB",
      "director": "Mr. Paul Davies",
      "current_price": 502.819,
      "market_cap": 5771083717274,
      "total_shares": 11477457529,
      "available_shares": 1539811799,
      "forecast": "Average",
      "demand": "Average",
      "benefit": {
        "requirement": 1500000,
        "description": "Entitled to receive improved interest rates"
      }
    }
  ]
}

一种理想的方法是在 Java 中有一个映射类并将 JSON 捕获为列表，然后您可以轻松地进行迭代。

private String json = "your json object here";

ObjectMapper objectMapper = new ObjectMapper();

List<MappingClass> stocks = objectMapper.readValue(jsonArray, new 
                            TypeReference<List<MappingClass>>(){});

  for (MappingClass stock : stocks) {
      stock.getName();
      // other fields
  }

尝试查看The Jackson Library和 ObjectMapper 以供参考。