JAVA-JSON将枚举列表序列化为类
我有这个枚举:JAVA-JSON将枚举列表序列化为类,java,json,hibernate,Java,Json,Hibernate,我有这个枚举: public enum Days implements Serializable { MONDAY, TUESDAY, WEDNESDAY, ... } 我想在商店类中使用它: public class Store{ private integer id_store; private String name; private Days days_visit; } 问题是,days\u visit需要是一个数
public enum Days implements Serializable {
MONDAY,
TUESDAY,
WEDNESDAY,
...
}
我想在商店类中使用它:
public class Store{
private integer id_store;
private String name;
private Days days_visit;
}
问题是,days\u visit
需要是一个数组,因为它可以超过一天;在数据库端,Days类型是Days类型:
CREATE TYPE schema.days AS ENUM
(MONDAY,
TUESDAY,
WEDNESDAY,
...);
表存储有一个“天”数组
days_visit schema.days[],
我如何用JSON序列化它?我尝试的JSON是:
{"id_store":"1", "name":"The Store", "days_visit":["MONDAY", "FRIDAY"]}
但我得到了这个错误:
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.domain.Days
out of START_ARRAY token
at [Source: io.undertow.servlet.spec.ServletInputStreamImpl@5c2a7de1; line: 1, column: 168] (through reference chain:
org.Stores["days_visit"])
如果我在课堂上像这样宣布访问日期:
public class Store{
private integer id_store;
private String name;
private Days[] days_visit;
}
在Wildfly中部署时出现以下错误:
[2020-01-28 11:42:09,970] Artifact app:war: Error during artifact deployment. See server log for details.
[2020-01-28 11:42:09,970] Artifact app:war: java.lang.Exception: {"WFLYCTL0080: Failed services" => {"jboss.persistenceunit.\"app.war#org\"" => "javax.persistence.PersistenceException: [PersistenceUnit: org_app] Unable to build Hibernate SessionFactory
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: org.app] Unable to build Hibernate SessionFactory
Caused by: org.hibernate.MappingException: Unable to instantiate custom type: org.hibernate.type.EnumType
Caused by: java.lang.ClassCastException: class [Lpy.org.app.domain.Days;"}}
有什么我遗漏的吗?问题似乎是反序列化JSON
com.fasterxml.jackson.databind.JsonMappingException:无法反序列化org.domain.Days的实例
Jackson无法反序列化枚举。您可以编写自定义反序列化器方法,并使用@JsonCreator
对其进行注释
根据您的需求/约束调整以下逻辑
public enum Days {
MONDAY("MONDAY"), TUESDAY("TUESDAY"), WEDNESDAY("WEDNESDAY");
Days(String value) {
this.value = value;
}
private String value;
@JsonCreator
public static Days[] create(@JsonProperty("days_visit") String[] days) {
Days[] days_visit = new Days[days.length];
for (int i = 0; i < days.length; i++) {
String currentDay = days[i];
for (Days day : values()) {
if (currentDay.equals(day.getValue())) {
days_visit[i] = day;
}
}
}
return days_visit;
}
public String getValue() {
return value;
}
}
公共枚举天数{
星期一(“星期一”)、星期二(“星期二”)、星期三(“星期三”);
天数(字符串值){
这个值=值;
}
私有字符串值;
@JsonCreator
公共静态天数[]创建(@JsonProperty(“Days\u visit”)字符串[]天){
天数[]天\就诊天数=新天数[天数.长度];
对于(int i=0;i
如果无法向枚举添加值,则在这种情况下可以创建自定义查找映射
public enum Days {
MONDAY, TUESDAY, WEDNESDAY;
static Map<String, Days> daysLookup = new HashMap<>();
static {
daysLookup.put("MONDAY", MONDAY);
daysLookup.put("TUESDAY", TUESDAY);
daysLookup.put("WEDNESDAY", WEDNESDAY);
}
@JsonCreator
public static Days[] create(@JsonProperty("days_visit") String[] days) {
Days[] days_visit = new Days[days.length];
for (int i = 0; i < days.length; i++) {
String currentDay = days[i];
days_visit[i] = daysLookup.get(currentDay);
}
return days_visit;
}
}
公共枚举天数{
星期一、星期二、星期三;
静态映射daysLookup=newhashmap();
静止的{
daysLookup.put(“周一”,周一);
daysLookup.put(“星期二”,星期二);
daysLookup.put(“星期三”,星期三);
}
@JsonCreator
公共静态天数[]创建(@JsonProperty(“Days\u visit”)字符串[]天){
天数[]天\就诊天数=新天数[天数.长度];
对于(int i=0;i
如果您不想污染您的域,您也可以使用来实现这一点。