我正在尝试使用Jackson-ObjectMapper将我的hashmap（JSON）反序列化为POJO类。下面是哈希图：
List<Object> setJSONValues = new ArrayList<Object>(Arrays.asList(requestObj));
List<String> setJSONKeys = apiUtility.readJSONKeys(new File("ABC.csv"));
HashMap<String, Object> requestMap = new HashMap<String, Object>();
if (setJSONKeys.size() == setJSONValues.size()) {
for (int i = 0; i < setJSONKeys.size(); i++) {
requestMap.put(setJSONKeys.get(i), setJSONValues.get(i));
}
}
我想使用对象映射器将此请求映射用于我的POJO类，如下所示：
objectMapper.readValue(objectMapper.writeValueAsString(requestMap), MyRequestDTO.class);
我得到以下错误： com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：无法识别的字段 “” apptDateTime“”（类Collector.MyRequestDTO）
Above error is coming because O/P of my objectMapper.writeValueAsString(requestMap) is :
{" \"apptDateTime\"":"\"2019-03-19 10:00:00\"","\"meter\"":"\"8682\""
添加Hashmap O / P：
for (String s:requestMap.keySet())
System.out.println("Key is "+s+"Value is "+requestMap.get(s));
输出：关键是“ apptDateTime”值是“ 2019-03-19 10:00:00”关键是 “表”的值为“ 8682”
Your utility method for reading the
keysdoes not work as you expect (this one:)It is returning keys and values wrapped in double quotes, so a key that is supposed to be
"apptDateTime"is actually returned as" \"apptDateTime\"". You can see this in the debug output you added: you don't add quotes around the keys or the values, but the output shows quotes anyway.您可以通过如下删除包装引号来解决该错误，但是最好修复首先返回意外数据的函数。