杰克逊 - 将java对象转换为json - 需要所有关键键到大写

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.

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();

and the result is

结果是

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

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

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"}]

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

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"}]

Can anyone help me on this.

谁可以帮我这个事。

Thanks in advance.

提前致谢。

2 个解决方案

#1

There are multiple ways to do it with Jackson.

杰克逊有多种方法可以做到这一点。

Annotations

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

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

Example:

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

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

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
}

#2

I would advice to use the @JsonNaming annotation on class level.

我建议在类级别使用@JsonNaming注释。

Yet afaik there is no strategy out there to fit your needs for total uppercase. But you can probably just write your own.

然而,afaik没有任何策略可以满足您对大写字母的需求。但你可以写自己的。

In my case I needed first character uppercase. So I used the existing @JsonNaming(value = UpperCamelCaseStrategy.class).

在我的情况下,我需要第一个字符大写。所以我使用了现有的@JsonNaming(value = UpperCamelCaseStrategy.class)。