我在尝试@JsonCreator
和@JsonProperty(value = "version", access = JsonProperty.Access.READ_ONLY)
这就是我班级的样子:
@Entity
public class Example1 implements Serializable {
private String field1;
private int field2;
private Example2 field3;
public Example1(@JsonProperty(value = "field_1", access = JsonProperty.Access.READ_WRITE) String field1,
@JsonProperty(value = "field_2", access = JsonProperty.Access.READ_ONLY) int field2,
@JsonProperty(value = "field_3_1", access = JsonProperty.Access.READ_WRITE) String field31,
@JsonProperty(value = "field_3_2", access = JsonProperty.Access.READ_WRITE) int field32
) {
this.field1 = field1;
this.field2 = field2;
this.field3 = new Example2(field31, field32);
}
// getters and setters omitted
}
它抛出了以下异常:
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Argument #1 of constructor [constructor for com.test.example.model.Example1, annotations: {interface com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator(mode=DEFAULT)}] has no property name annotation; must have name when multiple-parameter constructor annotated as Creator
at [Source: (File); line: 1, column: 1]
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:62) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:249) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:165) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:411) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:349) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:477) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:4145) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3995) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2878) ~[jackson-databind-2.9.0.pr3.jar:2.9.0.pr3]
我的环境详情:
我正在使用Spring Boot 2.0.0.M2
版本和Jackson 2.9.0.pr3
。
我的目的是在反序列化期间忽略 field2 。
我尝试在 field2 的setter方法中使用@JsonIgnore
作为替代方法。甚至,它不适用于@JsonCreator
。
答案 0 :(得分:0)
反序列化时有两种方法可以忽略该属性
只需在您不希望反序列化的属性中添加注释
@JsonProperty(access = Access.READ_ONLY)
private String readOnly;
这个方法应该小心,你应该把@JsonIgnore放在setter之前,并把@JsonProperty放在getter之前。并且对于属性应该清楚,没有任何注释。
@JsonProperty
public String getJsonIgnoreSetter() {
return jsonIgnoreSetter;
}
@JsonIgnore
public void setJsonIgnoreSetter(String jsonIgnoreSetter) {
this.jsonIgnoreSetter = jsonIgnoreSetter;
}
最后,@ JsonIgnore,@ JsonProperty,@ JsonProperty(access = xxx)的完整注释示例。
bean的定义
public class MockBean{
public MockBean() {
super(MockBean.class);
}
public MockBean(String attr1, String ignore, String jsonIgnore, String jsonIgnoreGetter,
String jsonIgnoreSetter, String jsonIgnoreProperties, String jsonIgnorePropertiesSetter,
String jsonIgnorePropertiesGetter, String readOnly, String writeOnly) {
super(MockBean.class);
this.attr1 = attr1;
this.ignore = ignore;
this.jsonIgnore = jsonIgnore;
this.jsonIgnoreGetter = jsonIgnoreGetter;
this.jsonIgnoreSetter = jsonIgnoreSetter;
this.jsonIgnoreProperties = jsonIgnoreProperties;
this.jsonIgnorePropertiesSetter = jsonIgnorePropertiesSetter;
this.jsonIgnorePropertiesGetter = jsonIgnorePropertiesGetter;
this.readOnly = readOnly;
this.writeOnly = writeOnly;
}
public String getAttr1() {
return attr1;
}
public void setAttr1(String name) {
this.attr1 = name;
}
public String getIgnore() {
return ignore;
}
public void setIgnore(String ignore) {
this.ignore = ignore;
}
public String getJsonIgnore() {
return jsonIgnore;
}
public void setJsonIgnore(String jsonIgnore) {
this.jsonIgnore = jsonIgnore;
}
@JsonIgnore
public String getJsonIgnoreGetter() {
return jsonIgnoreGetter;
}
@JsonProperty
public void setJsonIgnoreGetter(String jsonIgnoreGetter) {
this.jsonIgnoreGetter = jsonIgnoreGetter;
}
@JsonProperty
public String getJsonIgnoreSetter() {
return jsonIgnoreSetter;
}
@JsonIgnore
public void setJsonIgnoreSetter(String jsonIgnoreSetter) {
this.jsonIgnoreSetter = jsonIgnoreSetter;
}
public String getJsonIgnoreProperties() {
return jsonIgnoreProperties;
}
public void setJsonIgnoreProperties(String jsonIgnoreProperties) {
this.jsonIgnoreProperties = jsonIgnoreProperties;
}
public String getJsonIgnorePropertiesSetter() {
return jsonIgnorePropertiesSetter;
}
@JsonIgnoreProperties
public void setJsonIgnorePropertiesSetter(String jsonIgnorePropertiesSetter) {
this.jsonIgnorePropertiesSetter = jsonIgnorePropertiesSetter;
}
@JsonIgnoreProperties
public String getJsonIgnorePropertiesGetter() {
return jsonIgnorePropertiesGetter;
}
public void setJsonIgnorePropertiesGetter(String jsonIgnorePropertiesGetter) {
this.jsonIgnorePropertiesGetter = jsonIgnorePropertiesGetter;
}
public String getReadOnly() {
return readOnly;
}
public void setReadOnly(String readOnly) {
this.readOnly = readOnly;
}
public String getWriteOnly() {
return writeOnly;
}
public void setWriteOnly(String writeOnly) {
this.writeOnly = writeOnly;
}
private String attr1;
@Ignore
private String ignore;
@JsonIgnore
private String jsonIgnore;
@JsonIgnore
private String jsonIgnoreGetter;
@JsonIgnore
private String jsonIgnoreSetter;
@JsonIgnoreProperties
private String jsonIgnoreProperties;
private String jsonIgnorePropertiesSetter;
private String jsonIgnorePropertiesGetter;
@JsonProperty(access = Access.READ_ONLY)
private String readOnly;
@JsonProperty(access = Access.WRITE_ONLY)
private String writeOnly;
}
测试JSON
{
"name": "name",
"description": "description",
"attr1":"attr1",
"ignore": "ignore",
"jsonIgnore": "jsonIgnore",
"jsonIgnoreGetter": "jsonIgnoreGetter",
"jsonIgnoreSetter": "jsonIgnoreSetter",
"jsonIgnoreProperties": "jsonIgnoreProperties",
"jsonIgnorePropertiesSetter": "jsonIgnorePropertiesSetter",
"jsonIgnorePropertiesGetter": "jsonIgnorePropertiesGetter",
"readOnly": "readOnly",
"writeOnly": "writeOnly"
}
反序列化的结果:如果值为null,则不反序列化该值。