使用 Jackson JsonNodeFactory 的最佳方式 [英] Best way to use Jackson JsonNodeFactory

问题描述

我正在使用 Jackson 构建自定义 JSON 对象.这是正确的做法吗?

I'm using Jackson to build a custom JSON object. Is the correct way of going about this?

它似乎运行良好(并且输出正确)，但我可能缺少使用 JsonNodeFactory 的方式.该对象是否意味着像我在这里所做的那样传递?

It seems to work well (and the output is correct) but I may be missing the way I use JsonNodeFactory. Is the object meant to be passed around like I have done here?

JsonNodeFactory factory = JsonNodeFactory.instance;
ObjectNode dataTable = new ObjectNode(factory);
ArrayNode aaData = new ArrayNode(factory);

for (PkgLoad pkgLoad : pkgLoadList) {
    ObjectNode row = new ObjectNode(factory);
    row.put("ounces", pkgLoad.ounces);
    row.put("revolutions", pkgLoad.revolutions);
    aaData.add(row);
}

dataTable.put("aaData", aaData);

推荐答案

这有效，尽管意图是它是创建实例的工厂.但最常见的是，您只需使用 ObjectMapper 访问所有内容，例如:

This works, although intention is that it's factory that creates instances. But most commonly you just access all of it using ObjectMapper, like:

ObjectMapper mapper = new ObjectMapper();
ObjectNode dataTable = mapper.createObjectNode();
ArrayNode aa = dataTable.putArray("aaData");

单独的JsonNodeFactory的主要原因是允许你创建自定义节点类型(通常是标准实例的子类)；然后配置 ObjectMapper 以使用不同的工厂.为方便起见，ArrayNode 和 ObjectNode 确实引用了一个工厂实例，该实例与putArray"和其他需要创建新节点的方法一起使用.

The main reason for separate JsonNodeFactory is to allow you to create custom node types (usually sub-classes of standard instances); and then configure ObjectMapper to use different factory. For convenience, ArrayNode and ObjectNode do have reference to a factory instance, which is used with "putArray" and other methods that need to create new nodes.

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