java 使用Jackson将带有下划线的JSON反序列化为Java中的驼峰案例？
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Deserialising JSON with underscores to camel case in Java using Hymanson?
提问by Ram Patra
To serialize java objects with camel case attributes to json with underscore we use PropertyNamingStrategyas SNAKE_CASE.
要将具有驼峰式大小写属性的 java 对象序列化为带有下划线的 json，我们使用PropertyNamingStrategyas SNAKE_CASE。
So, is there something to do the opposite as well. That is, deserialise json with underscore to Java objects with camel case.
那么，是否也有相反的方法。也就是说，将带有下划线的 json 反序列化为带有驼峰式大小写的 Java 对象。
For example, JSON:
例如，JSON：
{
"user_id": "213sdadl"
"channel_id": "asd213l"
}
should be deserialised to this Java object:
应该反序列化为这个 Java 对象：
public class User {
String userId; // should have value "213sdadl"
String channelId; // should have value "asd213l"
}
I know one way of doing thiswhich is via @JsonPropertyannotation which works at field level. I am interested in knowing any global setting for this.
我知道这样做的一种方法是通过@JsonProperty在字段级别工作的注释。我有兴趣了解任何全局设置。
采纳答案by Sohlowmawn
Well, you can have an implementation for PropertyNamingStrategy that looks something like this:
好吧，你可以有一个 PropertyNamingStrategy 的实现，看起来像这样：
import org.codehaus.Hymanson.map.MapperConfig;
import org.codehaus.Hymanson.map.PropertyNamingStrategy;
import org.codehaus.Hymanson.map.introspect.AnnotatedField;
import org.codehaus.Hymanson.map.introspect.AnnotatedMethod;
public class CustomNameStrategy extends PropertyNamingStrategy {
@Override
public String nameForField(MapperConfig config, AnnotatedField field, String defaultName) {
return convert(defaultName);
}
@Override
public String nameForGetterMethod(MapperConfig config, AnnotatedMethod method, String defaultName) {
return convert(defaultName);
}
@Override
public String nameForSetterMethod(MapperConfig config, AnnotatedMethod method, String defaultName) {
return convert(defaultName);
}
public String convert(String defaultName) {
char[] arr = defaultName.toCharArray();
StringBuilder nameToReturn = new StringBuilder();
for (int i = 0; i < arr.length; i++) {
if (arr[i] == '_') {
nameToReturn.append(Character.toUpperCase(arr[i + 1]));
i++;
} else {
nameToReturn.append(arr[i]);
}
}
return nameToReturn.toString();
}
}
then in your implementation or the class that does the desrialization you can have:
然后在您的实现或执行反序列化的类中，您可以拥有：
ObjectMapper mapper = new ObjectMapper();
mapper.setPropertyNamingStrategy(new CustomNameStrategy());
YourClass yourClass = mapper.readValue(yourJsonString, YourClass.class);
