Question

如何将此JSON映射到对象？

{"d":"[{\"Key\":\"3\",\"ExternalKey\":\"143234A\",\"Name\":\"cup of juice\",\"Litres\":\"2 litres\",\"Date\":\"2016-10-06T08:32:27\",\"Capacity\":5.4900,\"CapacityType\":\"%\"}, {\"Key\":\"3\",\"ExternalKey\":\"143234A\",\"Name\":\"cup of milk\",\"Litres\":\"2.4 litres\",\"Date\":\"2016-10-06T08:32:27\",\"Capacity\":1667.6100,\"CapacityType\":\"M\"}]"}

我尝试过使用HashMap，但它只是将“d”作为字符串，其余部分作为带有一个元素的String对象

Answer 1

你的Json字符串有一些额外的“字符。

这是最后的json：

{
  "d": [
    {
      "Key": "3",
      "ExternalKey": "143234A",
      "Name": "cup of juice",
      "Litres": "2 litres",
      "Date": "2016-10-06T08:32:27",
      "Capacity": 5.49,
      "CapacityType": "%"
    },
    {
      "Key": "3",
      "ExternalKey": "143234A",
      "Name": "cup of milk",
      "Litres": "2.4 litres",
      "Date": "2016-10-06T08:32:27",
      "Capacity": 1667.61,
      "CapacityType": "M"
    }
  ]
}

现在你可以复制json并粘贴它here以获得pojo。

Answer 2

这是一个非常常见的问题，称为数据封送。在java中，杰克逊是一般的最佳解决方案。阅读本教程：http://wiki.fasterxml.com/JacksonInFiveMinutes

Answer 3

There are n numbers of libraries available for parsing the JSON and convert into in java classes.

Some of the examples are,

GSON
Jackson
Logan Square
Moshi, etc

You need to create a java class which map with your JSON Response and need to change your pojo according to parsing library.

For Example, 

Using Logan Square you must annotate your POJO class to @JsonObject and all properties must be annotated with @JsonField.

Now, you can parse your json using method 

...
LoganSquare.parse(jsonString, pojoClassName);
...

Hopefully this will help you.

Cheers

Answer 4

如果我对“d”键进行子串，并将其映射为JSON数组，那么它必须是现在的解决方案......

将JSON数组映射到Java POJO

4 个答案: