现在通过Jackson模块添加Jackson自定义序列化程序是冗长的,并不适合新的Java 8 lambda模式。
有没有办法使用Java 8 lambda样式添加自定义Jackson序列化程序?
答案 0 :(得分:4)
你可以制作一个简单的Jackson8Module,它可以让你做到以下几点:
ObjectMapper jacksonMapper = new ObjectMapper();
Jackson8Module module = new Jackson8Module();
module.addStringSerializer(LocalDate.class, (val) -> val.toString());
module.addStringSerializer(LocalDateTime.class, (val) -> val.toString());
jacksonMapper.registerModule(module);
Jackson8Module代码只是扩展了Jackson SimpleModule以提供Java 8友好方法(它可以扩展为支持其他Jackson Module方法):
public class Jackson8Module extends SimpleModule {
public <T> void addCustomSerializer(Class<T> cls, SerializeFunction<T> serializeFunction){
JsonSerializer<T> jsonSerializer = new JsonSerializer<T>() {
@Override
public void serialize(T t, JsonGenerator jgen, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
serializeFunction.serialize(t, jgen);
}
};
addSerializer(cls,jsonSerializer);
}
public <T> void addStringSerializer(Class<T> cls, Function<T,String> serializeFunction) {
JsonSerializer<T> jsonSerializer = new JsonSerializer<T>() {
@Override
public void serialize(T t, JsonGenerator jgen, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
String val = serializeFunction.apply(t);
jgen.writeString(val);
}
};
addSerializer(cls,jsonSerializer);
}
public static interface SerializeFunction<T> {
public void serialize(T t, JsonGenerator jgen) throws IOException, JsonProcessingException;
}
}
以下是Jackson8Module的要点:https://gist.github.com/jeremychone/a7e06b8baffef88a8816