杰克逊 - 将java对象转换为json - 需要所有关键键为大写

Question

需要你的帮助将java对象转换为json.当前json结果显示小写字母的所有键,我需要它是大写.

ObjectMapper mapper = new ObjectMapper();
Writer strWriter = new StringWriter();
mapper.writeValue(strWriter, obj);
String jsonString= strWriter.toString();

结果是

[{"flags":"1","name":"Peter","location":"London","startDate":"2012-01-06 00:00"}]

但我想要这样的结果(所有关键键值应该是大写的):

[{"FLAGS":"YU","NAME":"Peter","LOCATION":"London","STARTDATE":"2012-01-06 00:00"}]

并且也可以这样(大写的关键第一个字母):

[{"Flags":"1","Name":"Peter","Location":"London","StartDate":"2012-01-06 00:00"}]

谁可以帮我这个事.

提前致谢.

Answer 1

杰克逊有多种方法可以做到这一点.

注释

您可以使用字段或getter方法上的@JsonProperty 注释来注释对象.

例:

@JsonProperty("Name")
public final String name;

@JsonProperty("Location")
public String getLocation() {
  return location;
}

实现JsonSerializableWithType接口

@Override
public void serialize(final JsonGenerator jG, final SerializerProvider p)
    throws IOException, JsonProcessingException
{
    serializeWithType(jG, p, null);
}

@Override
public void serializeWithType(final JsonGenerator jG, final SerializerProvider p, final TypeSerializer typeSer)
    throws IOException, JsonProcessingException
{
    // here you can do your own serialization
}