在宁静的post调用中部分反序列化json对象

Question

I am trying to get a method in springmvc to accept a partial json string of an object, and have jackson automatically de-serialize it for me. I can solve it by making a temporary object with only the attributes I want, or pass it in as a string and use Gson to desearialize it for me, but these feel hacky. Is there any way to tell jackson how to do it?

Here is the controller snippet:

@RequestMapping(value = "/task", 
    method = RequestMethod.POST,
    consumes="application/json")
public @ResponseBody String postTask(@RequestBody Task task){
    if(task.getId() == null){
        task.setId(UUID.randomUUID());
    }
    if(task.getDate_entered() == 0){
        task.setDate_entered(System.currentTimeMillis());
    }
    TaskDao.addTask(task);
    return "success";
} 

And the task, a basic pojo:

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
public class Task {
    private UUID id;
    private String name;
    private String description;
    private long date_entered;
    private long finish_by;

    public UUID getId() {
        return id;
    }
    public void setId(UUID id) {
        this.id = id;
    }
    // Rest of the getters and setters
}

If you can't tell by my other spring related questions, I'm kind of flying blind, and can't figure out the proper google query for this one.

Thanks!

Answer 1

You need to use @JsonIgnore annotation of jackson on the method (on setter for deserialization and on getter for serialization) or field, for which you want to ignore serialization and/or deserialization. eg In your example, if you don't want to serialize description , then you can do,

@JsonIgnore
public void setDescription(String description) {
        this.description = description;
 }

And you will see, that you won't get value of description in converted model.