我有一个问题,误解杰克逊将json文件反序列化为poco。这是我的代码:
JsonParser jp = new JsonFactory().createJsonParser(new File(pathFile));
ObjectMapper objectMapper = new ObjectMapper();
MappingIterator<AnimalBean> animalsss = objectMapper.readValues(jp, AnimalBean.class);
while (animalsss.hasNext())
{
AnimalBean abba = animalsss.next();
System.out.println(abba.getNom());
}
我的POCO名为AnimalBean:
public class AnimalBean
{
private String id;
private String nom;
private String nom_scientifique;
private String classe;
private String ordre;
private String famille;
private String details_zone;
private String poids;
private String duree_gestation;
private String nb_gestation;
private String longevite;
private String description;
private String images;
... + all getter/setter
} 我的JSON文件:
{
"zoo": {
"animaux": {
"animal": [{
"id": 1,
"nom": "test",
"nom_scientifique": "test2",
"classe": 1,
"ordre": 3,
"famille": 4,
"details_zone": "Zones",
"poids": "80",
"duree_gestation": "11",
"nb_gestation": "1",
"longevite": "25 ans",
"description": "texte de description"
}]
}
}
}
当我执行我的代码时,我有以下错误:无法识别的字段“zoo”(类AnimalBean),未标记为可忽略。我知道问题是我的json文件不是直接由动物开始但我不能改变它,因为它不是我的。我已经尝试将objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);但它改变了一切。
有人可以帮助我吗?
答案 0 :(得分:1)
为什么不使用几个包装类来匹配JSON?
像:
public class Wrapper {
public Zoo zoo;
}
public class Zoo {
public Animals animaux;
}
public class Animals {
public Animal[] animal;
}
然后绑定:
Wrapper w = mapper.readValue(json, Wrapper.class);
for (Animal animal : w.zoo.animaux.animal) {
// process!
}
答案 1 :(得分:0)
这是完全未经测试的代码,因为我无法准确复制您的情况/代码。基本上它试图将值作为String并进行一些展开,然后创建另一个JsonParser。
ObjectMapper objectMapper = new ObjectMapper();
JsonParser jp = new JsonFactory().createJsonParser(new File(pathFile));
String json = jp.getText();
JsonNode node = objectMapper.readTree(json).get("Animal");
JsonParser jp2 = new JsonFactory().createJsonParser(node.getTextValue());
MappingIterator<AnimalBean> animalsss = objectMapper.readValues(jp2, AnimalBean.class);
while (animalsss.hasNext())
{
AnimalBean abba = animalsss.next();
System.out.println(abba.getNom());
}