杰克逊 - 将java对象转换为json - 需要所有关键键到大写 [英] Jackson - converting java object to json - Need all key keys to upper case

问题描述

需要您的帮助才能将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。

Need your help on conversion of java objects to json. current the json result showing all the key in small letter case, i need it to be upper case.

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）：

but i want results like this (all key key value should be in UPPER CASE):

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

也可以这样也（大写的关键首字母）：

and also is it possible to get like this also (key first letter in upper case):

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

任何人都可以帮助我。

提前致谢。

推荐答案

杰克逊有多种方法可以做到这一点。

There are multiple ways to do it with Jackson.

你可以注释您的对象使用 @JsonProperty 注释在您的字段或您的getter方法上。

You could annotate your object with @JsonProperty annotations on your fields or on your getter methods.

示例：

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

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

实施JsonSerializableWithType接口

Implement JsonSerializableWithType interface

@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
}

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