java - Springframework 中的单独序列化器

Question

我在项目中使用 springframeworks，对于 JSON，我们使用 jackson。一个列表应以特定方式序列化，即应具有特定的 JSON 输出。我遵循了这个thread的答案但这失败了。

@JsonSerialize(using = UserDataSerializer.class)
List<TestObj> lstTest;

和

public class UserDataSerializer extends StdSerializer<TestObj> {

    protected UserDataSerializer(Class<TestObj> t) {
        super(t);
    }

    @Override
    public void serialize(TestObj value, JsonGenerator gen, SerializerProvider provider) throws IOException {
        gen.writeStartObject();
        gen.writeObjectField(value.getName(), value.getValue());
        gen.writeEndObject();
    }
}

但不幸的是，这种方法失败了，但有一个异常(exception):

Servlet.service() for servlet [test3backend] in context with path [/test] threw exception [Request processing failed; nested exception is org.springframework.beans.f
actory.UnsatisfiedDependencyException: Error creating bean with name 'me.test.entities.UserDataSerializer': Unsatisfied dependency expressed through constructor paramete
r 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.Class<me.test.entities.TestObj>' av
ailable: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}] with root cause
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.Class<at.me.test.entities.TestObj>' available: expected at leas
t 1 bean which qualifies as autowire candidate. Dependency annotations: {}

有任何关于如何在我的项目中正确配置它的提示吗？

Answer 1

这个问题的主要问题是我没有包含默认的 null 构造函数，即添加

public UserDataSerializer() {
    this(null);
}

解决了这个问题。