Android JSON 无法从 START_OBJECT 中反序列化 ArrayList（JSON 结构错误）
Android JSON cant deserialize ArrayList out of START_OBJECT (JSON WITH BAD STRUCTURE)
大家好，我的客户端服务器有一些错误的 JSON 结构问题，我的客户端无法更改，我在这边有处理。
我正在从 JSON 创建 POJO，我已经尝试使用 GSON，现在我正在使用 JACKSON，因为我认为 JACKSON TREE 会帮助我。
这是服务器的问题，它在只有一个对象（扩展）时 returning 一个对象（扩展名），而在多个时 returning ArrayList。我知道这是一个糟糕的结构，为什么不 return 一个包含 1 个对象的数组，但我什么也做不了。
在我的 POJO class 中，换句话说，如果它只是一个添加到数组中，我想总是得到一个 ArrayList，否则什么都不做。
JSON例子：
{
"result": {
"FeatureCollection": {
"boundedBy": {
"Envelope": {
"lowerCorner": "-DUMMIE",
"srsName": "DUMMIE",
"upperCorner": "DUMMIE"
}
},
"featureMember": [
{
"Spill": {
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"extension": {
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
},
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
}
},
{
"Spill": {
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"extension": [
{
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
},
{
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
}
],
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
}
}
],
"xsi:schemaLocation": "DUMMIE",
"numberOfFeatures": 10
}
},
"status": "success"
}
POJO class 问题所在
public class Spill {
@JsonProperty("dataSource")
private String dataSource;
@JsonProperty("timeStamp")
private String timeStamp;
@JsonProperty("SARWind_windIntensity")
private Double SARWindWindIntensity;
@JsonProperty("reliabilityIndex")
private Double reliabilityIndex;
@JsonProperty("meteoWind_dataType")
private String meteoWindDataType;
@JsonProperty("eventid")
private String eventid;
@JsonProperty("center")
private Center center;
@JsonProperty("area")
private Double area;
@JsonProperty("description")
private String description;
@JsonProperty("SARWind_windDirection")
private Long SARWindWindDirection;
@JsonProperty("name")
private String name;
@JsonProperty("meteoWind_dataSource")
private String meteoWindDataSource;
@JsonProperty("length")
private Double length;
@JsonProperty("meteoWind_windIntensity")
private Double meteoWindWindIntensity;
@JsonProperty("SARWind_dataSource")
private String SARWindDataSource;
@JsonProperty("SARWind_dataType")
private String SARWindDataType;
@JsonProperty("meteoWind_windDirection")
private Long meteoWindWindDirection;
@JsonProperty("imageIdentifier")
private ImageIdentifier imageIdentifier;
@JsonProperty("width")
private Double width;
@JsonProperty("origin")
private String origin;
@JsonProperty("extension")
private List<Extension> extension = new ArrayList<Extension>();
@JsonProperty("boundedBy")
private BoundedBy__ boundedBy;
@JsonProperty("auxiliaryDataRef")
private AuxiliaryDataRef auxiliaryDataRef;
@JsonProperty("gml:id")
private String gmlId;
@JsonProperty("alignedWithTrack")
private Boolean alignedWithTrack;
@JsonProperty("distanceFromCoast")
private Long distanceFromCoast;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
/**
*
* @return The dataSource
*/
@JsonProperty("dataSource")
public String getDataSource() {
return dataSource;
}
/**
*
* @param dataSource
* The dataSource
*/
@JsonProperty("dataSource")
public void setDataSource(String dataSource) {
this.dataSource = dataSource;
}
/**
*
* @return The timeStamp
*/
@JsonProperty("timeStamp")
public String getTimeStamp() {
return timeStamp;
}
/**
*
* @param timeStamp
* The timeStamp
*/
@JsonProperty("timeStamp")
public void setTimeStamp(String timeStamp) {
this.timeStamp = timeStamp;
}
/**
*
* @return The SARWindWindIntensity
*/
@JsonProperty("SARWind_windIntensity")
public Double getSARWindWindIntensity() {
return SARWindWindIntensity;
}
/**
*
* @param SARWindWindIntensity
* The SARWind_windIntensity
*/
@JsonProperty("SARWind_windIntensity")
public void setSARWindWindIntensity(Double SARWindWindIntensity) {
this.SARWindWindIntensity = SARWindWindIntensity;
}
/**
*
* @return The reliabilityIndex
*/
@JsonProperty("reliabilityIndex")
public Double getReliabilityIndex() {
return reliabilityIndex;
}
/**
*
* @param reliabilityIndex
* The reliabilityIndex
*/
@JsonProperty("reliabilityIndex")
public void setReliabilityIndex(Double reliabilityIndex) {
this.reliabilityIndex = reliabilityIndex;
}
/**
*
* @return The meteoWindDataType
*/
@JsonProperty("meteoWind_dataType")
public String getMeteoWindDataType() {
return meteoWindDataType;
}
/**
*
* @param meteoWindDataType
* The meteoWind_dataType
*/
@JsonProperty("meteoWind_dataType")
public void setMeteoWindDataType(String meteoWindDataType) {
this.meteoWindDataType = meteoWindDataType;
}
/**
*
* @return The eventid
*/
@JsonProperty("eventid")
public String getEventid() {
return eventid;
}
/**
*
* @param eventid
* The eventid
*/
@JsonProperty("eventid")
public void setEventid(String eventid) {
this.eventid = eventid;
}
/**
*
* @return The center
*/
@JsonProperty("center")
public Center getCenter() {
return center;
}
/**
*
* @param center
* The center
*/
@JsonProperty("center")
public void setCenter(Center center) {
this.center = center;
}
/**
*
* @return The area
*/
@JsonProperty("area")
public Double getArea() {
return area;
}
/**
*
* @param area
* The area
*/
@JsonProperty("area")
public void setArea(Double area) {
this.area = area;
}
/**
*
* @return The description
*/
@JsonProperty("description")
public String getDescription() {
return description;
}
/**
*
* @param description
* The description
*/
@JsonProperty("description")
public void setDescription(String description) {
this.description = description;
}
/**
*
* @return The SARWindWindDirection
*/
@JsonProperty("SARWind_windDirection")
public Long getSARWindWindDirection() {
return SARWindWindDirection;
}
/**
*
* @param SARWindWindDirection
* The SARWind_windDirection
*/
@JsonProperty("SARWind_windDirection")
public void setSARWindWindDirection(Long SARWindWindDirection) {
this.SARWindWindDirection = SARWindWindDirection;
}
/**
*
* @return The name
*/
@JsonProperty("name")
public String getName() {
return name;
}
/**
*
* @param name
* The name
*/
@JsonProperty("name")
public void setName(String name) {
this.name = name;
}
/**
*
* @return The meteoWindDataSource
*/
@JsonProperty("meteoWind_dataSource")
public String getMeteoWindDataSource() {
return meteoWindDataSource;
}
/**
*
* @param meteoWindDataSource
* The meteoWind_dataSource
*/
@JsonProperty("meteoWind_dataSource")
public void setMeteoWindDataSource(String meteoWindDataSource) {
this.meteoWindDataSource = meteoWindDataSource;
}
/**
*
* @return The length
*/
@JsonProperty("length")
public Double getLength() {
return length;
}
/**
*
* @param length
* The length
*/
@JsonProperty("length")
public void setLength(Double length) {
this.length = length;
}
/**
*
* @return The meteoWindWindIntensity
*/
@JsonProperty("meteoWind_windIntensity")
public Double getMeteoWindWindIntensity() {
return meteoWindWindIntensity;
}
/**
*
* @param meteoWindWindIntensity
* The meteoWind_windIntensity
*/
@JsonProperty("meteoWind_windIntensity")
public void setMeteoWindWindIntensity(Double meteoWindWindIntensity) {
this.meteoWindWindIntensity = meteoWindWindIntensity;
}
/**
*
* @return The SARWindDataSource
*/
@JsonProperty("SARWind_dataSource")
public String getSARWindDataSource() {
return SARWindDataSource;
}
/**
*
* @param SARWindDataSource
* The SARWind_dataSource
*/
@JsonProperty("SARWind_dataSource")
public void setSARWindDataSource(String SARWindDataSource) {
this.SARWindDataSource = SARWindDataSource;
}
/**
*
* @return The SARWindDataType
*/
@JsonProperty("SARWind_dataType")
public String getSARWindDataType() {
return SARWindDataType;
}
/**
*
* @param SARWindDataType
* The SARWind_dataType
*/
@JsonProperty("SARWind_dataType")
public void setSARWindDataType(String SARWindDataType) {
this.SARWindDataType = SARWindDataType;
}
/**
*
* @return The meteoWindWindDirection
*/
@JsonProperty("meteoWind_windDirection")
public Long getMeteoWindWindDirection() {
return meteoWindWindDirection;
}
/**
*
* @param meteoWindWindDirection
* The meteoWind_windDirection
*/
@JsonProperty("meteoWind_windDirection")
public void setMeteoWindWindDirection(Long meteoWindWindDirection) {
this.meteoWindWindDirection = meteoWindWindDirection;
}
/**
*
* @return The imageIdentifier
*/
@JsonProperty("imageIdentifier")
public ImageIdentifier getImageIdentifier() {
return imageIdentifier;
}
/**
*
* @param imageIdentifier
* The imageIdentifier
*/
@JsonProperty("imageIdentifier")
public void setImageIdentifier(ImageIdentifier imageIdentifier) {
this.imageIdentifier = imageIdentifier;
}
/**
*
* @return The width
*/
@JsonProperty("width")
public Double getWidth() {
return width;
}
/**
*
* @param width
* The width
*/
@JsonProperty("width")
public void setWidth(Double width) {
this.width = width;
}
/**
*
* @return The origin
*/
@JsonProperty("origin")
public String getOrigin() {
return origin;
}
/**
*
* @param origin
* The origin
*/
@JsonProperty("origin")
public void setOrigin(String origin) {
this.origin = origin;
}
/**
*
* @return The extension
*/
@JsonProperty("extension")
public List<Extension> getExtension() {
return extension;
}
/**
*
* @param extension
* The extension
*/
@JsonProperty("extension")
public void setExtension(List<Extension> extension) {
this.extension = extension;
}
/**
*
* @return The boundedBy
*/
@JsonProperty("boundedBy")
public BoundedBy__ getBoundedBy() {
return boundedBy;
}
/**
*
* @param boundedBy
* The boundedBy
*/
@JsonProperty("boundedBy")
public void setBoundedBy(BoundedBy__ boundedBy) {
this.boundedBy = boundedBy;
}
/**
*
* @return The auxiliaryDataRef
*/
@JsonProperty("auxiliaryDataRef")
public AuxiliaryDataRef getAuxiliaryDataRef() {
return auxiliaryDataRef;
}
/**
*
* @param auxiliaryDataRef
* The auxiliaryDataRef
*/
@JsonProperty("auxiliaryDataRef")
public void setAuxiliaryDataRef(AuxiliaryDataRef auxiliaryDataRef) {
this.auxiliaryDataRef = auxiliaryDataRef;
}
/**
*
* @return The gmlId
*/
@JsonProperty("gml:id")
public String getGmlId() {
return gmlId;
}
/**
*
* @param gmlId
* The gml:id
*/
@JsonProperty("gml:id")
public void setGmlId(String gmlId) {
this.gmlId = gmlId;
}
/**
*
* @return The alignedWithTrack
*/
@JsonProperty("alignedWithTrack")
public Boolean getAlignedWithTrack() {
return alignedWithTrack;
}
/**
*
* @param alignedWithTrack
* The alignedWithTrack
*/
@JsonProperty("alignedWithTrack")
public void setAlignedWithTrack(Boolean alignedWithTrack) {
this.alignedWithTrack = alignedWithTrack;
}
/**
*
* @return The distanceFromCoast
*/
@JsonProperty("distanceFromCoast")
public Long getDistanceFromCoast() {
return distanceFromCoast;
}
/**
*
* @param distanceFromCoast
* The distanceFromCoast
*/
@JsonProperty("distanceFromCoast")
public void setDistanceFromCoast(Long distanceFromCoast) {
this.distanceFromCoast = distanceFromCoast;
}
@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
@JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
我试过的：
GSON:
CnsDetection cnsDetection = gson.fromJson(json, CnsDetection.class);
杰克逊
ObjectMapper mapper = new ObjectMapper();
cnsDetection = mapper.readValue(json, CnsDetection.class);
尝试使用自定义反序列化器但没有成功。
我的主要问题是如何将特定节点从对象更改为 arrayList，然后如何创建 CnsDetection 对象 包含 Spill 对象。
我也看过：
- How to dynamically handle json response array/object using Gson
- GSON Expected BEGIN_ARRAY but was BEGIN_OBJECT
更新
我试过@vzamanillo 的回答，但我遇到了几个错误，但这个回答让我走上了正确的道路，并为我的问题提供了正确的答案。
PS:as 他在这里问这是我的 ExtensionDeserializer:
注意： jacksonHelper 是一个单例，因此我可以在应用程序中重复使用映射器。
解串器不工作
public class ExtensionDeserializer extends JsonDeserializer<List<Extension>> {
JacksonHelper jacksonHelper = JacksonHelper.getInstance();
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
result =
jacksonHelper.getMapper().convertValue(node,
jacksonHelper.getMapper().getTypeFactory().constructCollectionType(List.class, Extension.class));
}
if (node.isArray()) {
result.add(jsonParser.readValueAs(Extension.class));
}
return result;
}}
WORKING Deserializer 感谢：@vzamanillo
public class ExtensionDeserializer extends JsonDeserializer<List<Extension>> {
JacksonHelper jacksonHelper = JacksonHelper.getInstance();
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
result.add(jacksonHelper.getMapper().treeToValue(node, Extension.class));
}
if (node.isArray()) {
result = jacksonHelper.getMapper().readValue(node.traverse(), new TypeReference<List<Extension>>() {
});
}
return result;
}}
在您的 JSON 结构的第一部分中，"extension" 包含一个对象，但是在第二个实例中您有一个对象数组。
即使您有 1 个对象，如果您可能有多个对象，您也应该始终使用数组来保持结构。
我认为问题在于解析 "extension" 数组。由于它也是一个数组，因此您应该在模型 class :
内部为其内容创建一个新的内部 class
public static class Extension {
@JsonProperty("area")
private Double area;
@JsonProperty("width")
public String width;
@JsonProperty("length")
public String length;
然后生成它的 setter 和 getter。为了更清楚地说明这一点，我将粘贴我用于以下案例的代码片段 JSON:
{
"table_name":"bbbb",
"table_version":1,
"table_data":[
{
"OPERATION":"aaaa",
"TRANSACTION_ID":1
}
]
}
为了解析那种 JSON，我使用了上面粘贴的模型； table_date 在我的例子中是内部 class.
此致，
为extension 属性 创建自定义JsonDeserializer 并检查节点类型是数组还是对象，如果节点是对象，则将其添加到返回的列表中。
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.ObjectCodec;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.ObjectMapper;
class ExtensionDeSerializer extends JsonDeserializer<List<Extension>> {
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
ObjectMapper mapper = new ObjectMapper();
// @firetrap less obscure and better solution
//result.add(jacksonHelper.getMapper().treeToValue(node, Extension.class));
result = mapper.convertValue(node, mapper.getTypeFactory().constructCollectionType(List.class, Extension.class));
}
if (node.isArray()) {
result.add(jsonParser.readValueAs(Extension.class));
}
return result;
}
}
将 @JsonDeserialize 注释添加到 POJO class 中的 extension 属性。
@JsonDeserialize(using=ExtensionDeSerializer.class)
@JsonProperty("extension")
private List<Extension> extension = new ArrayList<Extension>();
当 属性 可以是对象或数组时，这（可能）是解决问题的最有效方法。
希望对您有所帮助。
大家好，我的客户端服务器有一些错误的 JSON 结构问题，我的客户端无法更改，我在这边有处理。
我正在从 JSON 创建 POJO，我已经尝试使用 GSON，现在我正在使用 JACKSON，因为我认为 JACKSON TREE 会帮助我。
这是服务器的问题，它在只有一个对象（扩展）时 returning 一个对象（扩展名），而在多个时 returning ArrayList。我知道这是一个糟糕的结构，为什么不 return 一个包含 1 个对象的数组，但我什么也做不了。
在我的 POJO class 中，换句话说，如果它只是一个添加到数组中，我想总是得到一个 ArrayList，否则什么都不做。
JSON例子：
{
"result": {
"FeatureCollection": {
"boundedBy": {
"Envelope": {
"lowerCorner": "-DUMMIE",
"srsName": "DUMMIE",
"upperCorner": "DUMMIE"
}
},
"featureMember": [
{
"Spill": {
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"extension": {
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
},
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
}
},
{
"Spill": {
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
"extension": [
{
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
},
{
"Extension": {
"area": 401994.1,
"width": 288.6,
"DUMMIE": "DUMMIE",
"length": 2797,
}
}
],
"DUMMIE": "DUMMIE",
"DUMMIE": "DUMMIE",
}
}
],
"xsi:schemaLocation": "DUMMIE",
"numberOfFeatures": 10
}
},
"status": "success"
}
POJO class 问题所在
public class Spill {
@JsonProperty("dataSource")
private String dataSource;
@JsonProperty("timeStamp")
private String timeStamp;
@JsonProperty("SARWind_windIntensity")
private Double SARWindWindIntensity;
@JsonProperty("reliabilityIndex")
private Double reliabilityIndex;
@JsonProperty("meteoWind_dataType")
private String meteoWindDataType;
@JsonProperty("eventid")
private String eventid;
@JsonProperty("center")
private Center center;
@JsonProperty("area")
private Double area;
@JsonProperty("description")
private String description;
@JsonProperty("SARWind_windDirection")
private Long SARWindWindDirection;
@JsonProperty("name")
private String name;
@JsonProperty("meteoWind_dataSource")
private String meteoWindDataSource;
@JsonProperty("length")
private Double length;
@JsonProperty("meteoWind_windIntensity")
private Double meteoWindWindIntensity;
@JsonProperty("SARWind_dataSource")
private String SARWindDataSource;
@JsonProperty("SARWind_dataType")
private String SARWindDataType;
@JsonProperty("meteoWind_windDirection")
private Long meteoWindWindDirection;
@JsonProperty("imageIdentifier")
private ImageIdentifier imageIdentifier;
@JsonProperty("width")
private Double width;
@JsonProperty("origin")
private String origin;
@JsonProperty("extension")
private List<Extension> extension = new ArrayList<Extension>();
@JsonProperty("boundedBy")
private BoundedBy__ boundedBy;
@JsonProperty("auxiliaryDataRef")
private AuxiliaryDataRef auxiliaryDataRef;
@JsonProperty("gml:id")
private String gmlId;
@JsonProperty("alignedWithTrack")
private Boolean alignedWithTrack;
@JsonProperty("distanceFromCoast")
private Long distanceFromCoast;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
/**
*
* @return The dataSource
*/
@JsonProperty("dataSource")
public String getDataSource() {
return dataSource;
}
/**
*
* @param dataSource
* The dataSource
*/
@JsonProperty("dataSource")
public void setDataSource(String dataSource) {
this.dataSource = dataSource;
}
/**
*
* @return The timeStamp
*/
@JsonProperty("timeStamp")
public String getTimeStamp() {
return timeStamp;
}
/**
*
* @param timeStamp
* The timeStamp
*/
@JsonProperty("timeStamp")
public void setTimeStamp(String timeStamp) {
this.timeStamp = timeStamp;
}
/**
*
* @return The SARWindWindIntensity
*/
@JsonProperty("SARWind_windIntensity")
public Double getSARWindWindIntensity() {
return SARWindWindIntensity;
}
/**
*
* @param SARWindWindIntensity
* The SARWind_windIntensity
*/
@JsonProperty("SARWind_windIntensity")
public void setSARWindWindIntensity(Double SARWindWindIntensity) {
this.SARWindWindIntensity = SARWindWindIntensity;
}
/**
*
* @return The reliabilityIndex
*/
@JsonProperty("reliabilityIndex")
public Double getReliabilityIndex() {
return reliabilityIndex;
}
/**
*
* @param reliabilityIndex
* The reliabilityIndex
*/
@JsonProperty("reliabilityIndex")
public void setReliabilityIndex(Double reliabilityIndex) {
this.reliabilityIndex = reliabilityIndex;
}
/**
*
* @return The meteoWindDataType
*/
@JsonProperty("meteoWind_dataType")
public String getMeteoWindDataType() {
return meteoWindDataType;
}
/**
*
* @param meteoWindDataType
* The meteoWind_dataType
*/
@JsonProperty("meteoWind_dataType")
public void setMeteoWindDataType(String meteoWindDataType) {
this.meteoWindDataType = meteoWindDataType;
}
/**
*
* @return The eventid
*/
@JsonProperty("eventid")
public String getEventid() {
return eventid;
}
/**
*
* @param eventid
* The eventid
*/
@JsonProperty("eventid")
public void setEventid(String eventid) {
this.eventid = eventid;
}
/**
*
* @return The center
*/
@JsonProperty("center")
public Center getCenter() {
return center;
}
/**
*
* @param center
* The center
*/
@JsonProperty("center")
public void setCenter(Center center) {
this.center = center;
}
/**
*
* @return The area
*/
@JsonProperty("area")
public Double getArea() {
return area;
}
/**
*
* @param area
* The area
*/
@JsonProperty("area")
public void setArea(Double area) {
this.area = area;
}
/**
*
* @return The description
*/
@JsonProperty("description")
public String getDescription() {
return description;
}
/**
*
* @param description
* The description
*/
@JsonProperty("description")
public void setDescription(String description) {
this.description = description;
}
/**
*
* @return The SARWindWindDirection
*/
@JsonProperty("SARWind_windDirection")
public Long getSARWindWindDirection() {
return SARWindWindDirection;
}
/**
*
* @param SARWindWindDirection
* The SARWind_windDirection
*/
@JsonProperty("SARWind_windDirection")
public void setSARWindWindDirection(Long SARWindWindDirection) {
this.SARWindWindDirection = SARWindWindDirection;
}
/**
*
* @return The name
*/
@JsonProperty("name")
public String getName() {
return name;
}
/**
*
* @param name
* The name
*/
@JsonProperty("name")
public void setName(String name) {
this.name = name;
}
/**
*
* @return The meteoWindDataSource
*/
@JsonProperty("meteoWind_dataSource")
public String getMeteoWindDataSource() {
return meteoWindDataSource;
}
/**
*
* @param meteoWindDataSource
* The meteoWind_dataSource
*/
@JsonProperty("meteoWind_dataSource")
public void setMeteoWindDataSource(String meteoWindDataSource) {
this.meteoWindDataSource = meteoWindDataSource;
}
/**
*
* @return The length
*/
@JsonProperty("length")
public Double getLength() {
return length;
}
/**
*
* @param length
* The length
*/
@JsonProperty("length")
public void setLength(Double length) {
this.length = length;
}
/**
*
* @return The meteoWindWindIntensity
*/
@JsonProperty("meteoWind_windIntensity")
public Double getMeteoWindWindIntensity() {
return meteoWindWindIntensity;
}
/**
*
* @param meteoWindWindIntensity
* The meteoWind_windIntensity
*/
@JsonProperty("meteoWind_windIntensity")
public void setMeteoWindWindIntensity(Double meteoWindWindIntensity) {
this.meteoWindWindIntensity = meteoWindWindIntensity;
}
/**
*
* @return The SARWindDataSource
*/
@JsonProperty("SARWind_dataSource")
public String getSARWindDataSource() {
return SARWindDataSource;
}
/**
*
* @param SARWindDataSource
* The SARWind_dataSource
*/
@JsonProperty("SARWind_dataSource")
public void setSARWindDataSource(String SARWindDataSource) {
this.SARWindDataSource = SARWindDataSource;
}
/**
*
* @return The SARWindDataType
*/
@JsonProperty("SARWind_dataType")
public String getSARWindDataType() {
return SARWindDataType;
}
/**
*
* @param SARWindDataType
* The SARWind_dataType
*/
@JsonProperty("SARWind_dataType")
public void setSARWindDataType(String SARWindDataType) {
this.SARWindDataType = SARWindDataType;
}
/**
*
* @return The meteoWindWindDirection
*/
@JsonProperty("meteoWind_windDirection")
public Long getMeteoWindWindDirection() {
return meteoWindWindDirection;
}
/**
*
* @param meteoWindWindDirection
* The meteoWind_windDirection
*/
@JsonProperty("meteoWind_windDirection")
public void setMeteoWindWindDirection(Long meteoWindWindDirection) {
this.meteoWindWindDirection = meteoWindWindDirection;
}
/**
*
* @return The imageIdentifier
*/
@JsonProperty("imageIdentifier")
public ImageIdentifier getImageIdentifier() {
return imageIdentifier;
}
/**
*
* @param imageIdentifier
* The imageIdentifier
*/
@JsonProperty("imageIdentifier")
public void setImageIdentifier(ImageIdentifier imageIdentifier) {
this.imageIdentifier = imageIdentifier;
}
/**
*
* @return The width
*/
@JsonProperty("width")
public Double getWidth() {
return width;
}
/**
*
* @param width
* The width
*/
@JsonProperty("width")
public void setWidth(Double width) {
this.width = width;
}
/**
*
* @return The origin
*/
@JsonProperty("origin")
public String getOrigin() {
return origin;
}
/**
*
* @param origin
* The origin
*/
@JsonProperty("origin")
public void setOrigin(String origin) {
this.origin = origin;
}
/**
*
* @return The extension
*/
@JsonProperty("extension")
public List<Extension> getExtension() {
return extension;
}
/**
*
* @param extension
* The extension
*/
@JsonProperty("extension")
public void setExtension(List<Extension> extension) {
this.extension = extension;
}
/**
*
* @return The boundedBy
*/
@JsonProperty("boundedBy")
public BoundedBy__ getBoundedBy() {
return boundedBy;
}
/**
*
* @param boundedBy
* The boundedBy
*/
@JsonProperty("boundedBy")
public void setBoundedBy(BoundedBy__ boundedBy) {
this.boundedBy = boundedBy;
}
/**
*
* @return The auxiliaryDataRef
*/
@JsonProperty("auxiliaryDataRef")
public AuxiliaryDataRef getAuxiliaryDataRef() {
return auxiliaryDataRef;
}
/**
*
* @param auxiliaryDataRef
* The auxiliaryDataRef
*/
@JsonProperty("auxiliaryDataRef")
public void setAuxiliaryDataRef(AuxiliaryDataRef auxiliaryDataRef) {
this.auxiliaryDataRef = auxiliaryDataRef;
}
/**
*
* @return The gmlId
*/
@JsonProperty("gml:id")
public String getGmlId() {
return gmlId;
}
/**
*
* @param gmlId
* The gml:id
*/
@JsonProperty("gml:id")
public void setGmlId(String gmlId) {
this.gmlId = gmlId;
}
/**
*
* @return The alignedWithTrack
*/
@JsonProperty("alignedWithTrack")
public Boolean getAlignedWithTrack() {
return alignedWithTrack;
}
/**
*
* @param alignedWithTrack
* The alignedWithTrack
*/
@JsonProperty("alignedWithTrack")
public void setAlignedWithTrack(Boolean alignedWithTrack) {
this.alignedWithTrack = alignedWithTrack;
}
/**
*
* @return The distanceFromCoast
*/
@JsonProperty("distanceFromCoast")
public Long getDistanceFromCoast() {
return distanceFromCoast;
}
/**
*
* @param distanceFromCoast
* The distanceFromCoast
*/
@JsonProperty("distanceFromCoast")
public void setDistanceFromCoast(Long distanceFromCoast) {
this.distanceFromCoast = distanceFromCoast;
}
@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
@JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
我试过的： GSON:
CnsDetection cnsDetection = gson.fromJson(json, CnsDetection.class);
杰克逊
ObjectMapper mapper = new ObjectMapper();
cnsDetection = mapper.readValue(json, CnsDetection.class);
尝试使用自定义反序列化器但没有成功。 我的主要问题是如何将特定节点从对象更改为 arrayList，然后如何创建 CnsDetection 对象 包含 Spill 对象。
我也看过： - How to dynamically handle json response array/object using Gson - GSON Expected BEGIN_ARRAY but was BEGIN_OBJECT
更新
我试过@vzamanillo 的回答，但我遇到了几个错误，但这个回答让我走上了正确的道路，并为我的问题提供了正确的答案。 PS:as 他在这里问这是我的 ExtensionDeserializer:
注意： jacksonHelper 是一个单例，因此我可以在应用程序中重复使用映射器。
解串器不工作
public class ExtensionDeserializer extends JsonDeserializer<List<Extension>> {
JacksonHelper jacksonHelper = JacksonHelper.getInstance();
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
result =
jacksonHelper.getMapper().convertValue(node,
jacksonHelper.getMapper().getTypeFactory().constructCollectionType(List.class, Extension.class));
}
if (node.isArray()) {
result.add(jsonParser.readValueAs(Extension.class));
}
return result;
}}
WORKING Deserializer 感谢：@vzamanillo
public class ExtensionDeserializer extends JsonDeserializer<List<Extension>> {
JacksonHelper jacksonHelper = JacksonHelper.getInstance();
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
result.add(jacksonHelper.getMapper().treeToValue(node, Extension.class));
}
if (node.isArray()) {
result = jacksonHelper.getMapper().readValue(node.traverse(), new TypeReference<List<Extension>>() {
});
}
return result;
}}
在您的 JSON 结构的第一部分中，"extension" 包含一个对象，但是在第二个实例中您有一个对象数组。
即使您有 1 个对象，如果您可能有多个对象，您也应该始终使用数组来保持结构。
我认为问题在于解析 "extension" 数组。由于它也是一个数组，因此您应该在模型 class :
内部为其内容创建一个新的内部 classpublic static class Extension {
@JsonProperty("area")
private Double area;
@JsonProperty("width")
public String width;
@JsonProperty("length")
public String length;
然后生成它的 setter 和 getter。为了更清楚地说明这一点，我将粘贴我用于以下案例的代码片段 JSON:
{
"table_name":"bbbb",
"table_version":1,
"table_data":[
{
"OPERATION":"aaaa",
"TRANSACTION_ID":1
}
]
}
为了解析那种 JSON，我使用了上面粘贴的模型； table_date 在我的例子中是内部 class.
此致，
为extension 属性 创建自定义JsonDeserializer 并检查节点类型是数组还是对象，如果节点是对象，则将其添加到返回的列表中。
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.ObjectCodec;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.ObjectMapper;
class ExtensionDeSerializer extends JsonDeserializer<List<Extension>> {
@Override
public List<Extension> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
List<Extension> result = new ArrayList<Extension>();
if (node.isObject()) {
ObjectMapper mapper = new ObjectMapper();
// @firetrap less obscure and better solution
//result.add(jacksonHelper.getMapper().treeToValue(node, Extension.class));
result = mapper.convertValue(node, mapper.getTypeFactory().constructCollectionType(List.class, Extension.class));
}
if (node.isArray()) {
result.add(jsonParser.readValueAs(Extension.class));
}
return result;
}
}
将 @JsonDeserialize 注释添加到 POJO class 中的 extension 属性。
@JsonDeserialize(using=ExtensionDeSerializer.class)
@JsonProperty("extension")
private List<Extension> extension = new ArrayList<Extension>();
当 属性 可以是对象或数组时，这（可能）是解决问题的最有效方法。
希望对您有所帮助。