java Jackson 中键/值对的序列化？
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Serialization of key/value pairs in Hymanson?
提问by Heiko Rupp
I have a class
我有一堂课
class Foo {
String key;
String value;
}
and want to serialize this into "<content of key>":"<content of value>"How can I achieve this (and how to deserialize "myKey":"myVal"into a Fooobject?
并想将其序列化为"<content of key>":"<content of value>"如何实现这一点（以及如何反序列"myKey":"myVal"化为Foo对象？
I was trying to use
我试图使用
@JsonValue
public String toString() {
return "\"" + key + "\":\"" + value + "\"";
}
But clearly end up with too many quotes.
但显然最终引用太多。
@JsonValue
public String toString() {
return key + ":" + value;
}
also does not work, as it does not create enough quotes.
也不起作用，因为它没有创建足够的引号。
回答by Heiko Rupp
I found one way, which is using a JsonSerializer like this:
我找到了一种方法，它使用这样的 JsonSerializer：
public class PropertyValueSerializer extends JsonSerializer<Foo> {
@Override
public void serialize(Foo property_value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
jsonGenerator.writeStartObject();
jsonGenerator.writeFieldName(property_value.getKey());
jsonGenerator.writeString(property_value.getValue());
jsonGenerator.writeEndObject();
}
The Fooclass needs to know about this:
本Foo类需要了解这一点：
@JsonSerialize(using = PropertyValueSerializer.class)
public class Foo {
Deserializing is very similar:
反序列化非常相似：
public class PropertyValueDeserializer extends JsonDeserializer<PROPERTY_VALUE> {
@Override
public Foo deserialize(JsonParser jsonParser,
DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
String tmp = jsonParser.getText(); // {
jsonParser.nextToken();
String key = jsonParser.getText();
jsonParser.nextToken();
String value = jsonParser.getText();
jsonParser.nextToken();
tmp = jsonParser.getText(); // }
Foo pv = new Foo(key,value);
return pv;
}
And this also needs to be annotated on the Foo class:
这也需要在 Foo 类上进行注释：
@JsonSerialize(using = PropertyValueSerializer.class)
@JsonDeserialize(using = PropertyValueDeserializer.class)
public class Foo implements Serializable{
