我有这样的JSON输入
{
"slices": [{
"slice": {
"boundedBy": {
"Envelope": {
"axisLabels": "Lat Long ansi",
"lowerCorner": "-44.975 111.975 \"2003-01-01T00:00:00+00:00\"",
"upperCorner": "-8.975 155.975 \"2003-01-01T00:00:00+00:00\"",
"srsDimension": 3
}
},
"fileReferenceHistory": "/home/rasdaman/rasdaman_community/rasdaman/systemtest/testcases_services/test_all_wcst_import/testdata/wcs_local_metadata_tiff_no_specify_bands/GlobLAI-20030101-20030110-H01V06-1.0_MERIS-FR-LAI-HA.tiff",
"local_metadata_key": "value_1"
}
},
{
"slice": {
"boundedBy": {
"Envelope": {
"axisLabels": "Lat Long ansi",
"lowerCorner": "-44.975 111.975 \"2003-10-01T00:00:00+00:00\"",
"upperCorner": "-8.975 155.975 \"2003-10-01T00:00:00+00:00\"",
"srsDimension": 3
}
},
"fileReferenceHistory": "/home/rasdaman/rasdaman_community/rasdaman/systemtest/testcases_services/test_all_wcst_import/testdata/wcs_local_metadata_tiff_no_specify_bands/GlobLAI-20031001-20031010-H00V10-1.0_MERIS-FR-LAI-HA.tiff",
"local_metadata_key": "value_2"
}
}
],
"Title": "Drought code",
// other keys:values
}
带“ slices”的是“ slice”对象的数组。在“切片”中没有任何“键”:“值”,但这不是问题。
然后,我有一个POJO类
public class CoverageMetadata {
@JsonProperty(value = "slices")
@JacksonXmlElementWrapper(useWrapping = false)
private List<LocalMetadata> localMetadataList;
private Map<String, String> globalMetadataAttributesMap;
@JsonAnySetter
public void addKeyValue(String key, String value) {
this.globalMetadataAttributesMap.put(key, value);
}
@JsonAnyGetter
public Map<String, String> getGlobalAttributesMap() {
return globalMetadataAttributesMap;
}
// other gettters, setters without Jackson annotations
}
和列表中的一个类:
public class LocalMetadata {
public static final String LOCAL_METADATA_TAG = "slice";
private Map<String, String> localMetadataAttributesMap;
private BoundedBy boundedBy;
@JsonAnySetter
// NOTE: To map an unknown list of properties, must use this annotation
public void addKeyValue(String key, String value) {
this.localMetadataAttributesMap.put(key, value);
}
public LocalMetadata() {
this.localMetadataAttributesMap = new LinkedHashMap<>();
this.boundedBy = new BoundedBy();
}
@JsonAnyGetter
// NOTE: to unwrap the "map" from { "map": { "key": "value" } }, only keep { "key": "value" }
public Map<String, String> getLocalMetadataAttributesMap() {
return localMetadataAttributesMap;
}
public BoundedBy getBoundedBy() {
return this.boundedBy;
}
public void setBoundedBy(BoundedBy boundedBy) {
this.boundedBy = boundedBy;
}
public LocalMetadata(Map<String, String> localMetadataAttributesMap, BoundedBy boundedBy) {
this.localMetadataAttributesMap = localMetadataAttributesMap;
this.boundedBy = boundedBy;
}
}
以及将JSON反序列化为对象的基本代码
ObjectMapper objectMapper = new ObjectMapper();
CoveageMetadata coverageMetadata = objectMapper.readValue(metadata, CoverageMetadata.class);
当我尝试反序列化CoverageMetadata对象的JSON输入时,出现错误
Cannot deserialize coverage's metadata in XML/JSON by Jackson, error: Can not deserialize instance of java.lang.String out of START_OBJECT token
at [Source: {"slices":[{"slice":{"boundedBy":{"Envelope":{"axisLabels":"Lat Long ansi","srsDimension":3,"lowerCorner":"-44.975 111.975 \"2003-01-01T00:00:00+00:00\"","upperCorner":"-8.975 155.975 \"2003-01-01T00:00:00+00:00\""}},"local_metadata_key":"value_1","fileReferenceHistory":"/home/rasdaman/rasdaman_community/rasdaman/systemtest/testcases_services/test_all_wcst_import/testdata/wcs_local_metadata_tiff_no_specify_bands/GlobLAI-20030101-20030110-H01V06-1.0_MERIS-FR-LAI-HA.tiff"}}],"Title":"Drought code"}; line: 1, column: 21] (through reference chain: petascope.core.gml.metadata.model.CoverageMetadata["slices"]->java.util.ArrayList[0]->petascope.core.gml.metadata.model.LocalMetadata["slice"]).
如何将每个“切片”元素的JSON输入字符串反序列化为CoverageMetadataObject,将其映射到LocalMetadata对象?
答案 0 :(得分:0)
简单的答案是,我创建另一个POJO类来保存“切片”列表,在CoverageMetadata类中,它将具有
public class CoverageMetadata {
private Map<String, String> globalMetadataAttributesMap;
@JsonProperty(value = "slices")
private LocalMetadata localMetadata;
...
}
新的POJO类(之前的LocalMetadata类已重命名为LocalMetadataChild)
public class LocalMetadata {
@JsonProperty(value = "slice")
// This is the most important thing to avoid duplicate <slices><slices> when serializing in XML.
@JacksonXmlElementWrapper(useWrapping = false)
private List<LocalMetadataChild> localMetadataList;
public LocalMetadata(List<LocalMetadataChild> localMetadataList) {
this.localMetadataList = localMetadataList;
}
public LocalMetadata() {
this.localMetadataList = new ArrayList<>();
}
public List<LocalMetadataChild> getLocalMetadataList() {
return localMetadataList;
}
public void setLocalMetadataList(List<LocalMetadataChild> localMetadataList) {
this.localMetadataList = localMetadataList;
}
}