如果能知道最好的方法，可以最好地利用杰克逊注释将我们从Salesforce接收到的以下JSON响应反序列化为Java对象.
I would appreciate any help to know the best way to deserialize the following JSON response which we receive from Salesforce into a Java object using Jackson Annotations.
"records": [ { "attributes": { "type": "Lead", "url": "/services/data/v30.0/sobjects/Lead/00Qi000000Jr44XEAR" }, "Id": "00Qi000000Jr44XEAR", "Name": "Kristen Akin", "Address": { "city": null, "country": "USA", "state": "CA", "stateCode": null, "street": null }, "Phone": "(434) 369-3100", }, { "attributes": { "type": "Lead", "url": "/services/data/v30.0/sobjects/Lead/00Qi000000Jugv2EAB" }, "Id": "00Qi000000Jugv2EAB", "Name": "Sarah Jones", "Address": { "city": null, "country": null, "state": "CA", "stateCode": null, "street": null }, "Phone": "(408) 338-6066", } ]}上面的JSON响应是一个包含2个元素的数组.我想用Jackson将此JSON结构表示为Java集合，就像这样:
The above JSON response is an array which contains 2 elements. I would like to represent this JSON structure as a Java Collection using Jackson, something like:
@JsonProperty("records") ArrayList<LinkedHashMap<?, ?>> recordList以上对象表示形式反序列化JSON响应，并在HashMap中表示为键-值"对，但问题是表示属性"和地址"子文档.在上面的HashMap中，它们的值表示为相应的JSON子文档，而我希望将Attributes子文档映射到Attribute对象，并且将Address子文档映射到HashMap中的Address对象，类似:
The above object representation deserializes the JSON response and represent as a Key-Value pair in HashMap but issue is representing "attributes" and "Address" subdocuments. In the above HashMap their value is being represented as the respective JSON subdocument whereas I would prefer to have Attributes subdocument gets mapped to an Attribute object and similarly Address subdocument mapped to an Address object in the HashMap, something like:
Key Value attributes <Attributes> object Id 00Qi000000Jr44XEAR ..... Address <Address> object Phone (434) 369-3100在进行了一些Google搜索之后，我发现我可能必须使用@JsonTypeInfo和@JsonSubTypes属性，如本链接.
After doing some Google search, I figured I might have to use @JsonTypeInfo and @JsonSubTypes attributes as mentioned in this link.
但是，我无法弄清楚在这种特定情况下如何使用这些注释.感谢任何帮助.
However, I could not figure how to use these annotations in this specific scenario. Appreciate any help on this.
推荐答案如果JSON输入的结构是完全动态的，则可以将其读取为JsonNode甚至是Map.有关更多信息，请参考此链接.
If the structure of your JSON input is completely dynamic, you can read it as JsonNode or even as Map. Refer to this link for more info.
如果您想将JSON映射到Java类，但您不知道编译类型中的所有属性，则可以利用 @ JsonAnyGetter/@ JsonAnySetter注释.这是一个基于JSON的示例，该示例在内部映射中存储Address类的未知属性.
If you want to map your JSON to java classes but you don't know all the attributes in compile type, you can leverage the @JsonAnyGetter/@JsonAnySetter annotations. Here is an example based on your JSON that stores the unknown attributes for the Address class in the internal map.
public class JacksonMapping { public static final String JSON = "..."; public static class Attributes { public String type; public URI url; } public static class Address { public String city; public String country; public String state; public Integer stateCode; public String street; private final Map<String, Object> otherAttributes = new HashMap<>(); @JsonAnySetter public void setProperty(String name, Object value) { otherAttributes.put(name, value); } @JsonAnyGetter public Map<String, Object> getOtherAttributes() { return otherAttributes; } } public static class Record { @JsonProperty("Id") public String id; @JsonProperty("Name") public String name; public Attributes attributes; @JsonProperty("Address") public Address address; @JsonProperty("Phone") public String phone; } public static class RecordList { public List<Record> records; } public static void main(String[] args) throws IOException { ObjectMapper mapper = new ObjectMapper(); RecordList recordList = mapper.readValue(JSON, RecordList.class); System.out.println(mapper.writerWithDefaultPrettyPrinter() .writeValueAsString(recordList)); } }在工具的帮助下，我也可以尝试从JSON生成Java对象.例如以下示例: www.jsonschema2pojo
I can also try to generate java objects from your JSON with a help from a tool. For example this one: www.jsonschema2pojo
更多推荐
如何使用Jackson将JSON数组中的子文档表示为Java Collection?
发布评论