redis - Jackson2HashMapper 不使用 Flatten=True 序列化 Date

Question

将 Jackson Hash Mapper 与 Flatten=true 结合使用，我的日期字段将被丢弃。这是正确的行为还是错误？有没有办法用 Flatten=true 序列化 Date？

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

如果我改变 new Jackson2HashMapper(false);然后我得到:

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能序列化 Date 字段 - 可能还有一个描述日期类型的附加字段(扁平化)。

我将其原因追溯到 HashMapper 代码中的以下行:typingMapper.enableDefaultTyping(DefaultTyping.NON_FINAL, As.PROPERTY);配置映射器的位置。

Answer 1

它似乎在 Jackson2HashMapper 中发出。深入Jackson2HashMapper的源码后，好像问题在Jackson2HashMapper。为此创建了一个问题，DATAREDIS-1001Jackson2HashMapper does not serialize Date/Calender fields when flatten = true