如何在fastxml中实现自定义序列化功能 [英] How to implement customized serialization feature in fasterxml

问题描述

我的JSON：

{
name：asdf，
age：15 ，
地址：{
street：asdf
}
}

如果street为null，使用 JsonSerialize.Inclusion.NON_NULL ，我可以得到..

If street is null, with JsonSerialize.Inclusion.NON_NULL, I can get..

{
name：asdf，
age：15，
地址：{}
}

但我希望得到这样的东西..（当地址不为空时，它是一个新的/空对象。但是街道是空的。）

But I want to get something like this.. (when address is not null, it is a new/empty object. But street is null.)

{
name：asdf，
age：15
}

我认为有自定义序列化功能，如 JsonSerialize.Inclusion.VALID_OBJECT 。
在Address类中添加isValid（）方法然后如果返回true则序列化，否则不要序列化。

I thought to have custom serialization feature like JsonSerialize.Inclusion.VALID_OBJECT. Adding isValid() method in the Address class then if that returns true serialize else don't serialize.

但我不知道如何继续/要覆盖的类。这是可能的还是其他任何观点？请建议。

But I don't know how to proceed further/which class to override. Is this possible or any other views on this? Please suggest.

已添加课程

public static void main(String[] args) {
    ObjectMapper mapper = new ObjectMapper();
    Customer customer = new Customer();
    customer.setName("name");
    customer.setAddress(new Address());
    mapper.writeValue(new File("d:\\customer.json"), customer);
}

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class Customer {

private String name;
private Address address;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Address getAddress() {
    return address;
}
public void setAddress(Address address) {
    this.address = address;
}
}

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class Address {

private String street;

public String getStreet() {
    return street;
}
public void setStreet(String street) {
    this.street = street;
}
}

注意：我现在不担心反序列化。即丢失地址对象。

Note: I am not worrying about deserialization now. i.e, loss of address object.

提前致谢。

推荐答案

使用序列化的自定义JSON对象非常简单。

Customized JSON Object using Serialization is Very Simple.

我在我的项目中写了一个claas我给你一个如何在项目中实现它的线索

I have wrote a claas in my project i am giving u a clue that how to Implement this in Projects

贷款申请（POJO类）

Loan Application (POJO Class)

 import java.io.Serializable;
 import java.util.List;
 import org.webservice.business.serializer.LoanApplicationSerializer;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;


  @JsonSerialize(using=LoanApplicationSerializer.class)
  public class LoanApplication  implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;
private double amount;
private User borrowerId;
private String businessType;
private String currency;
private int duration;
private Date lastChangeDate;
private long loanApplicationId;
private String myStory;
private String productCategory;
private String purpose;
private Date startDate;
private String status;
private String type;
private String salesRepresentative;

现在 LoanApplicationSerializer 包含使用自定义的类序列化逻辑................

Now LoanApplicationSerializer class that contains the Customization using Serialization Logic................

    package org.ovamba.business.serializer;

  import java.io.IOException;
  import org.webservice.business.dto.LoanApplication;
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;

 public class LoanApplicationSerializer extends JsonSerializer<LoanApplication> {

@Override
public void serialize(LoanApplication prm_objObjectToSerialize, JsonGenerator prm_objJsonGenerator, SerializerProvider prm_objSerializerProvider) throws IOException, JsonProcessingException {
    if (null == prm_objObjectToSerialize) {
    } else {
        try {
            prm_objJsonGenerator.writeStartObject();
            prm_objJsonGenerator.writeNumberField("applicationId", prm_objObjectToSerialize.getLoanApplicationId());
            prm_objJsonGenerator.writeStringField("status", prm_objObjectToSerialize.getStatus());
            prm_objJsonGenerator.writeNumberField("amount", prm_objObjectToSerialize.getAmount());
            prm_objJsonGenerator.writeNumberField("startdate", prm_objObjectToSerialize.getStartDate().getTime());
            prm_objJsonGenerator.writeNumberField("duration", prm_objObjectToSerialize.getDuration());
            prm_objJsonGenerator.writeStringField("businesstype", prm_objObjectToSerialize.getBusinessType());
            prm_objJsonGenerator.writeStringField("currency", prm_objObjectToSerialize.getCurrency());
            prm_objJsonGenerator.writeStringField("productcategory", prm_objObjectToSerialize.getProductCategory());
            prm_objJsonGenerator.writeStringField("purpose", prm_objObjectToSerialize.getPurpose());
            prm_objJsonGenerator.writeStringField("mystory", prm_objObjectToSerialize.getMyStory());
            prm_objJsonGenerator.writeStringField("salesRepresentative", prm_objObjectToSerialize.getSalesRepresentative());
        } catch (Exception v_exException) {
            //ExceptionController.getInstance().error("Error while Serializing the Loan Application Object", v_exException);
        } finally {
            prm_objJsonGenerator.writeEndObject();
        }
    }
  }
}

Hope This may help u alot. Thanks..

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