我有以下JSON:
{ "_id" : "3", "longitude" : "3222", "latitude" : "55", "timeDateOfUsage" : ["02/11/17 13:30:35", "1", "02/11/17 13:30:45", "1", "02/11/17 13:30:51", "0"] }
我正在尝试使用杰克逊将其转换为pojo。这就是我所拥有的:
String inputJson = "{ \"_id\" : \"3\", \"longitude\" : \"3222\",
\"latitude\" : \"55\", \"timeDateOfUsage\" : [\"02/11/17 13:30:35\", \"1\", \"02/11/17 13:30:45\", \"1\", \"02/11/17 13:30:51\", \"0\"] }";
ObjectMapper mapper = new ObjectMapper().setVisibility(JsonMethod.FIELD, JsonAutoDetect.Visibility.ANY);
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
try{
dbResponseonce response = mapper.readValue(inputJson,dbResponseonce.class);
System.out.println(response.getLatitude());
} catch (JsonParseException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
我的另一个类的字段被命名为JSON中的元素,并具有getter和setter。
上面的代码可以工作,但是当我只创建一个没有配置的基本ObjectMapper对象时,它不起作用。为什么是这样?这是堆栈跟踪错误:
org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "_id" (Class dbResponseonce), not marked as ignorable
这是我的pojo类,它有getter和setter:
public class dbResponseonce {
private String _id;
public String getId() { return this._id; }
public void setId(String _id) { this._id = _id; }
private String longitude;
public String getLongitude() { return this.longitude; }
public void setLongitude(String longitude) { this.longitude = longitude; }
private String latitude;
public String getLatitude() { return this.latitude; }
public void setLatitude(String latitude) { this.latitude = latitude; }
private ArrayList<String> timeDateOfUsage;
public ArrayList<String> getTimeDateOfUsage() { return this.timeDateOfUsage; }
public void setTimeDateOfUsage(ArrayList<String> timeDateOfUsage) { this.timeDateOfUsage = timeDateOfUsage; }}
答案 0 :(得分:2)
_id
的getter和setter不正确。
尝试按如下方式定义它们:
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
或者使用_id
@JsonProperty("_id")