Gson 名称数组并包含一个新属性答案

【问题标题】：Gson name array and include a new propertyGson 名称数组并包含一个新属性
【发布时间】：2014-10-28 02:02:03
【问题描述】：

我开始使用 json，需要一些帮助来解决这个问题。

我有一个pojo

 public class HiReceiptsObj{
       private string warehouse_id;
       private String owner_id;
private String receipt;

.....// all with Getters and setters

}

我调用一个 java 方法，在其中加载一个收据的 ArrayList，就像这样

List<HiReceiptsObj> receipts = new ArrayList<HiReceiptsObj>();

然后我使用 gson 将 ArrayList 转换为 json

String receiptsJson = new Gson().toJson(receipts);
            response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write(receiptsJson);

这将输出

    [{"warehouse_id":"US01","owner_id":"NP   ","receipt":"INV"},
{"warehouse_id":"US01","owner_id":"NP   ","receipt":"082212-3047 "},
{"warehouse_id":"US01","owner_id":"NP   ","receipt":"INVADJUST"}]

我需要这种输出

{
  "total_pages": 10,
  "rows": [
   {"warehouse_id":"US01","owner_id":"NP   ","receipt":"INV"},
   {"warehouse_id":"US01","owner_id":"NP   ","receipt":"082212-3047 "}, 
    {"warehouse_id":"US01","owner_id":"NP   ","receipt":"INVADJUST"}
    ]

}

我已经阅读了有关此的其他帖子，但它们对我来说太高级了，有人可以帮忙吗？

谢谢

【问题讨论】：

标签： java javascript json gson

【解决方案1】：

1) 你还应该有一个持有者类来满足你的目的：

public class ReceiptHolder {
    @SerializedName("total_pages")
    private int totalPages;

    private List<HiReceiptsObj> rows;

    // TODO: add getter / setters
}

2) 创建receiptHolder 实例并填充它：

List<HiReceiptsObj> receipts = new ArrayList<HiReceiptsObj>();
ReceiptHolder receiptHolder = new ReceiptHolder();
receiptHolder.setRows(receipts);
receiptHolder.setTotalPages(receipts.size());

3) 序列化receiptHolder:

String receiptsJson = new Gson().toJson(receiptHolder );

随心所欲地输出：

{
  "total_pages": 10,
  "rows": [
    {
      "warehouse_id": "US01",
      "owner_id": "NP   ",
      "receipt": "INV"
    },
    {
      "warehouse_id": "US01",
      "owner_id": "NP   ",
      "receipt": "082212-3047 "
    },
    {
      "warehouse_id": "US01",
      "owner_id": "NP   ",
      "receipt": "INVADJUST"
    }
  ]
}

【讨论】：