Jakarta EE JakartaOne Livestream Japanese 2022, 27 Sep 2022

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From YouTube: CN4J Studio - An introduction of Jakarta JSON Binding and useful use cases

Description

JSON-B is a standard JSON binding framework for converting Java objects to and from JSON messages. It defines a default mapping algorithm for converting existing Java classes to JSON and allows developers to customize the mapping content using Java annotations. In this session, we will introduce the basic usage of JSON-B and its convenient usage in combination with other technologies.

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Okay,, it's the next time,, so I'd like to resume it. Next, I'd like to continue with an.

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Overview of Jakarta Jason Viking by Microsoft Braza and how to use it, conveniently. I, would like to.

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Introduce you. Thank you very much. Today is a limited time of 15 minutes,. So I would like to proceed in this flow,, but basically, I will focus on the source. Code. First of all, I would like to proceed with JSONB,, but if you want to know what it is, please see, here. You can create JSON data from Java objects,, and this is called an acquaintance. Diagram.

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Creating Java objects from JSON data is called deserialization, and.

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Jason B is the one who provides such an API that allows you to write and read. Json data. Here is the most important interface in this JSON P,. But please take a look. Here.As I mentioned earlier,.

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Methods for serializing and deserializing Specifically,, fromjason and toJSON We provide a method like this.

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Please use the appropriate method as needed. That 's what I think,, but because, when you use JAXA lessons,, this JSONB is already applied from the beginning,. So if you.

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Specify the application JSON in the Prodi series,, it will be. The default for JS. B can now be used,.

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So I'd definitely like it.

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Please, take a look: here. I've just launched a project that I've been working on,. So if you look at the defense section, here, you'll see that Jakarta.

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Jason's 3.0 that I'm using this time is actually.

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Using the JSON part that comes into Jackra's team. As for Yasson,, this is the 3-win implementation of JSONB,, but it seems to be using 3.00.The. Project itself has not released 10.0. Yet when the program is running., It is made using 9.1,, but.

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By adding such a dependent environment with the 9.1 power,, it is possible to verify the latest JSONB.

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I would like to confirm the method,, but first of all,. Please take a look at this one. You.

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Can use the method to create an instance.At? This point, I wrote it using the trywith resource,, because JSONP is an.

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Interface that implements the autoclosable interface.

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After creating an instance of , an object called user is defined, and the.

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Actual object is generated by inserting data into the instance variables of this user object. But.

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This time, for simplicity, I wrote it as a public field in a public class,, but it's in the.

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Form of directly inserting the current value into the field. Actually,.

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When creating JSON data after Java objects are generated,, it is actually serialized,, but when you do it,, you.

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Can call it a meditation called 2JSON of JSON. You can create it.The JSON data created this time is returned as a result. However,. It is in the form of returning it in the jaxrs rest side.

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Jakarta E10 We are currently running it on the reference implementation,. So when we run sample 1 now,, this kind of data is actually returned.. This is the JSON string that was actually generated. If. You actually look at the object for a moment,. You can see that the data that is said to be a 49-year-old prediction temple is.

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Filled with an ID that is generated by the ID here. So,.

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From the JSON data that I created this time, I want to generate a user object.

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By assigning a JSON character string and specifying how to fix it,, it is.

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Now possible to create a user object. It was via JSON,, but jaxrs said that this JSONving is properly integrated,. So this time I will assign the user object to NTT and return it. This method is annotated with Produces Media Type Application JSON,. So what happens is that in this sample, the value that was returned was a user object,, but what was actually returned was in this form: I think you.

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Can understand that JSON data is being returned.Jsomp is called internally from Jax RS and returned.I would like to proceed to sample 3. The.

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Environment I'm running now is actually Java. 17, and records have been added since Java 16. Although. This is not clearly written in the JSONB specification yet,. It is.

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Written that Yasson 3.0,, the reference implementation, supports, records. I, actually tried it out, and I.

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Defined what I call a user, record, and I'm actually doing it here to see if it can be handled by JSONB. In, the name, I would.

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Like to add a record to the name, and I would like to create JSON data. I.

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Think that you can.

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Understand that it can also handle JSONB, polymorphic type. Support. I would like to introduce the part. It's a.

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Json file that stores people's information,. But if you look at this, it depends on the type of visitor type., It.

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Feels like the expiry date, you're.

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Getting is included,, too. There is a lot of information, and although we are all the same, visitors, I.

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Think that the type of information we handle can change depending on the type of information we handle. I did n't have it,, but this time, polymorphic type support has been added to the new version.

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Newly,, a station called JSONTypeinfo and a station called JSON subtype have been added,, and this visitor class will be the best parent class.

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However, for this key, we have values, such as employee,, partner, and one-time..

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As, you saw earlier, if you are a partner,.

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There are parameters such as expiry dates and when you can access, and if you are an employee, information such as whether you are still enrolled or not. We,.

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Have this kind of information, such as whether a request has been made or whether it has expired. Based on this,? We will actually implement the program, but first. Regarding, the acquaintance diagram,. Here we create instances such as Entroy,, Partner, and Onetime, and.

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Add each to the list. The.

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Json data that corresponds to this will be completed.

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Based on some JSON data,, it's deserialized and turned into an object,, but for that,. The important point is the type,, which is the vegetal list type,, and it's taken as an array. List. So, we're going to take data in the form of list visitors, and we'll.

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Create Java objects based on the given JSON, and we're actually doing this. By.

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Mapping JSON data to Java objects, for example,. As far as the data is concerned,, entropy and parsing are possible.. There are things like toner and one-time,, but you can also.

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Write a program that uses a lambda expression to filter out only the employee information from the visitors and output it. Now, I would like to actually run this,, but this is the actual serialized data.

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As, you saw earlier, the data included, not only employees but also partner and customer information,, but among them, we used a lambda expression to extract only the entroy. You will also be able to write a program that extracts data and displays only that part.Then. It's.

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Customization of JSON data.

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Specifically,, when handling JSON, changes can be applied, throughout, and.

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Only specific fields or properties can be changed,, so that's about it. Specifically,. If you write transient as JSON data,, this ID will not be included in the JSON.

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However, in JSON,.

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If you want to use a user underscore name instead of a name,, you can actually change this name to a user name.

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The standard is ISO, 8601 format, YY minute mm -DD,. But if you want to change it to slash mm/DD, use this format. In addition,, you can.

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Change the numeric format, too. You can change it with the JSON number format.

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Default,, even the property part is invisible,, but.

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If you want to properly write the data to be painted as JSON data,, you can specify the field name as JSON miratable TRUE. Then,, the value to be assigned there can be written in the form of painting. Other than that,. It is a setting that can be applied. Throughout.However, create an instance of this JSON config and set each setting with this config If. You want to do the whole thing,. You can do it individually using that statement. If you want to do it for JSONB configuration, specific., I.

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Please take a look at the unformatted data. The.

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Data is formatted properly, and the date is also displayed with slashes. It's, a.

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Form like this for parchment, soda.

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Chase orders.

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Are actually locale data and customers. It's.

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Defined as an object that writes something like having order status,, but in this form, JSON such as perch order can also be written properly. Small things like samples It is now possible to handle not only the data but also proper data. I.

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Would like to end the introduction of my sample with this,, since it is now possible to do something like a payment plan at Rise.. How was everyone. Today? I have.

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Introduced it to you,, but here I am.

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Introducing important information for obtaining new information,, so I would be happy if you could obtain new information and try it.

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Thank you very much for your time. Today.