使用jackson散列映射器和flatten=true,我的日期字段将被丢弃。这是正确的行为还是错误?是否有方法将日期序列化为flatten=true?
我使用了以下测试pojo:
import java.util.Date;
public class FooClass{
private Boolean foolean;
private Integer barteger;
private String simpleString;
private Date myDate;
public void setFoolean(Boolean value){ foolean = value; }
public Boolean getFoolean(){ return foolean; }
public void setBarteger(Integer value){ barteger = value; }
public Integer getBarteger(){ return barteger; }
public void setSimpleString(String value) { simpleString = value; }
public String getSimpleString(){ return simpleString; }
public void setMyDate(Date value) { myDate = value; }
public Date getMyDate(){ return myDate; }
}
public class Main {
public static void main(String[] args) throws ParseException,
JsonParseException, JsonMappingException, IOException {
Jackson2HashMapper hashMapper = new Jackson2HashMapper(true);
FooClass fooObject = new FooClass();
fooObject.setFoolean(true);
fooObject.setBarteger(10);
fooObject.setSimpleString("Foobar");
fooObject.setMyDate(new Date());
Map<String, Object> hash = hashMapper.toHash(fooObject);
for (String key: hash.keySet())
{
System.out.println("hash contains: " + key + "=" +
hash.get(key.toString()));
}
FooClass newFoo = (FooClass)(hashMapper.fromHash(hash));
System.out.println("FromHash: " + newFoo);
}
}
在这种情况下,我得到以下输出:
hash contains: @class=FooClass
hash contains: foolean=true
hash contains: barteger=10
hash contains: simpleString=Foobar
FromHash: FooClass@117159c0
如果我更改新的jackson2hashmapper(false);则得到:
hash contains: @class=FooClass
hash contains: foolean=true
hash contains: barteger=10
hash contains: simpleString=Foobar
hash contains: myDate=[java.util.Date, 1547033077869]
FromHash: FooClass@7ed7259e
我希望在这两种情况下都序列化日期字段-可能还有一个描述日期类型的额外字段(扁平化)。
我在hashmapper代码中找到了原因:
typingMapper.enableDefaultTyping(DefaultTyping.NON_FINAL, As.PROPERTY);
配置映射器的位置。
最佳答案
似乎在Jackson2HashMapper
中有问题。
在深入研究了jackson2hashmapper的源代码之后,它似乎在Jackson2HashMapper
中出现了问题。
为此创建了一个问题,DATAREDIS-1001Jackson2HashMapper does not serialize Date/Calender fields when flatten = true