jackson读取json tree讲解

待读取的json文本:

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需求:使用jsckson读取其中的count节点数值以及遍历list下的所有节点,,获取symbol的后六位.

分析:count是常规节点,直接用get往里取即可,list是个数组节点,需要用遍历器.

实现:

ObjectMapper mapper = new ObjectMapper();
JsonNode node = mapper.readTree(json); // 将文本转成json树
int count=Integer.parseInt(node.get("data").get("count").asText());// 取data节点下的count节点

JsonNode listNode=node.get("data").path("list");// 取list节点

// 遍历list节点的子节点
Iterator<JsonNode> iterator = listNode.elements();
while (iterator.hasNext()) {
    JsonNode stock = iterator.next();
    String code=stock.get("symbol").asText().substring(2);// 取节点文本
    ...
}

...

--2020年5月5日--