跳至主要内容

JSON-B 1.0

JSON-B 1.0

JSON-P provides the lower JSON node operations, JSON Binding API provides advanced operations on serialization of Java objects to JSON string and deserialization of JSON string to Java objects.

Serialization

An example to serilize a Java object to JSON string.
Person duke = new Person("Duke", LocalDate.of(1995, 5, 23));
duke.setPhoneNumbers(
  Arrays.asList(
    new PhoneNumber(HOME, "100000"),
    new PhoneNumber(OFFICE, "200000")
  )
);

Jsonb jsonMapper = JsonbBuilder.create();
String json = jsonMapper.toJson(duke);

LOG.log(Level.INFO, "converted json result: {0}", json);
JsonPath allow you read the values of JSON nodes.
String name = JsonPath.parse(json).read("$.name");
assertEquals("Duke", name);
JsonPath.using() method accepts cusotm configuration APIs to configure the json provider, eg. using Gson instead of the default json provider.
Configuration config = Configuration.defaultConfiguration()
  .jsonProvider(new GsonJsonProvider())
  .mappingProvider(new GsonMappingProvider());
TypeRef<List<String>> typeRef = new TypeRef<List<String>>() {
};

List<String> numbers = JsonPath.using(config).parse(json).read("$.phoneNumbers[*].number", typeRef);

assertEquals(Arrays.asList("100000", "200000"), numbers);

Deserialization

Read the json string and map to an object directly.
Jsonb jsonMapper = JsonbBuilder.create();

Person person = jsonMapper.fromJson(JsonbTest.class.getResourceAsStream("/person.json"), Person.class);

assertEquals("Duke", person.getName());

Type type = new ArrayList<Person>() {}
  .getClass()
  .getGenericSuperclass();

List<Person> persons = jsonMapper.fromJson(JsonbTest.class.getResourceAsStream("/persons.json"), type);

assertTrue(persons.size() == 2);

JSON-B annotations

JSON-B provides a series of annotations to adjust the serialization and deserialization for an object, including @JsonbProperty, @JsonbPropertyOrder, @JsonbTransient etc.
@JsonbProperty 
private String name;
Grab the source codes from my github account, and have a try.

评论

此博客中的热门博文

AngularJS CakePHP Sample codes

Introduction This sample is a Blog application which has the same features with the official CakePHP Blog tutorial, the difference is AngularJS was used as frontend solution, and CakePHP was only use for building backend RESR API. Technologies AngularJS   is a popular JS framework in these days, brought by Google. In this example application, AngularJS and Bootstrap are used to implement the frontend pages. CakePHP   is one of the most popular PHP frameworks in the world. CakePHP is used as the backend REST API producer. MySQL   is used as the database in this sample application. A PHP runtime environment is also required, I was using   WAMP   under Windows system. Post links I assume you have some experience of PHP and CakePHP before, and know well about Apache server. Else you could read the official PHP introduction( php.net ) and browse the official CakePHP Blog tutorial to have basic knowledge about CakePHP. In these posts, I tried to follow the steps describ

JPA 2.1: Attribute Converter

JPA 2.1: Attribute Converter If you are using Hibernate, and want a customized type is supported in your Entity class, you could have to write a custom Hibernate Type. JPA 2.1 brings a new feature named attribute converter, which can help you convert your custom class type to JPA supported type. Create an Entity Reuse the   Post   entity class as example. @Entity @Table(name="POSTS") public class Post implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name="ID") private Long id; @Column(name="TITLE") private String title; @Column(name="BODY") private String body; @Temporal(javax.persistence.TemporalType.DATE) @Column(name="CREATED") private Date created; @Column(name="TAGS") private List<String> tags=new ArrayList<>(); } Create an attribute convert

Auditing with Hibernate Envers

Auditing with Hibernate Envers The approaches provided in JPA lifecyle hook and Spring Data auditing only track the creation and last modification info of an Entity, but all the modification history are not tracked. Hibernate Envers fills the blank table. Since Hibernate 3.5, Envers is part of Hibernate core project. Configuration Configure Hibernate Envers in your project is very simple, just need to add   hibernate-envers   as project dependency. <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-envers</artifactId> </dependency> Done. No need extra Event listeners configuration as the early version. Basic Usage Hibernate Envers provides a simple   @Audited   annotation, you can place it on an Entity class or property of an Entity. @Audited private String description; If   @Audited   annotation is placed on a property, this property can be tracked. @Entity @Audited public class Signup implements Serializa