默认jackon行为似乎同时使用属性(getter和setter)和字段来序列化和反序列化为json。
我想使用字段作为序列化配置的规范源，因此不希望jackson查看所有属性。
我可以用注释在单个类的基础上做到这一点:
@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, setterVisibility = Visibility.NONE)
但我不想在每节课上都这么做……
是否可以全局配置?比如添加一些到对象映射器?
当前回答
特别是对于布尔is*() getter:
我花了很多时间来解释为什么都没有
@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, setterVisibility = Visibility.NONE)
也不是这
setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.NONE);
setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE);
setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
适用于我的布尔Getter/Setter。
解决方法很简单:
@JsonAutoDetect(isGetterVisibility = Visibility.NONE, ...
setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.NONE);
spring-boot允许配置:
jackson:
visibility.field: any
visibility.getter: none
visibility.setter: none
visibility.is-getter: none
参见通用应用程序属性# JACKSON
其他回答
我使用的是jackson 1.9.10
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(JsonMethod.ALL, Visibility.NONE);
mapper.setVisibility(JsonMethod.FIELD, Visibility.ANY);
开启自动还原。
@自2.10版本我们可以使用JsonMapper。构建器和接受的答案可以如下所示:
JsonMapper mapper = JsonMapper.builder()
.visibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY)
.visibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE)
.visibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.NONE)
.visibility(PropertyAccessor.CREATOR, JsonAutoDetect.Visibility.NONE)
.build();
在Jackson 2.0及以后版本中，您可以简单地使用:
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
...
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, Visibility.NONE);
mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
关闭自动检测。
如果您使用Spring Boot，您可以全局配置Jackson，如下所示:
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
@Configuration
public class JacksonObjectMapperConfiguration implements Jackson2ObjectMapperBuilderCustomizer {
@Override
public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
jacksonObjectMapperBuilder.visibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
jacksonObjectMapperBuilder.visibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
jacksonObjectMapperBuilder.visibility(PropertyAccessor.CREATOR, JsonAutoDetect.Visibility.ANY);
}
}
在Kotlin中使用数据类和方法是非常棘手的。例如在课堂上:
data class SomeClass(val foo: String, val bar: String, val isSomething: Boolean):Serializable { fun isEmpty() = foo.isEmpty() }
我得到json像:{"bar"="bar"， "empty"=false， "foo"="foo"， "isSomething"=true} 设置之后:setVisibility(PropertyAccessor. properties)IS_GETTER JsonAutoDetect.Visibility.NONE) json是:{"bar"="bar"， "foo"="foo"}
唯一的方法，我发现有isSomething和没有空是添加@JsonIgnore或@JvmSynthetic注释的isEmpty()
此外，有趣的事实是，添加像isFoo(): Boolean这样的方法只将foo序列化一次，作为字符串。
