To configure the mapping of web requests, you use the annotation. When configuring Spring MVC, you need to specify the mappings between the requests and handler methods. In Spring MVC applications, the RequestDispatcher (Front Controller Below) servlet is responsible for routing incoming HTTP requests to handler methods of controllers. In this post, you’ll see how versatile the annotation is when used to map Spring MVC controller methods. This annotation maps HTTP requests to handler methods of MVC and REST controllers. If you have specific requirements or preferences, you can explicitly configure the preferred JSON mapper using the property mentioned above.ĭrop me your questions related to producing and consuming JSON in Spring Boot REST APIs.Is one of the most common annotation used in Spring Web applications. In most cases, it might be more straightforward to rely on the default configuration. Also, note that Spring Boot provides the flexibility in choosing a JSON library, In Spring Boot, Jackson is the default JSON mapper library used. nulls= # Whether to serialize null fields. printing= # Whether to output serialized JSON that fits in a page for pretty printing. serialization-policy= # Serialization policy for Long and long types. = # Whether to be lenient about parsing JSON that doesn't conform to RFC 4627. non-executable-json= # Whether to generate non executable JSON by prefixing the output with some special text. naming-policy= # Naming policy that should be applied to an object's field during serialization and deserialization. fields-without-expose-annotation= # Whether to exclude all fields from consideration for serialization or deserialization that do not have the 'Expose' annotation. complex-map-key-serialization= # Whether to enable serialization of complex map keys (i.e. inner-class-serialization= # Whether to exclude inner classes during serialization. html-escaping= # Whether to disable the escaping of HTML characters such as '<', '>', etc.We can customize the various aspects of serialization and deserialization using Gson using the following properties: -format= # Format to use when serializing Date objects. If multiple mappers are present,we need to specify the default mapper explicitly.įor example, to make Gson the preferred JSON mapper, use the ‘ -json-mapper‘ property in application.properties file. If only one supported mapper is available, Spring Boot will use it as the default. Spring boot detects the presence of Gson.class and uses GsonAutoConfiguration for configuring the Gson instance.īy default, Spring Boot will try to auto-configure a JSON mapper based on the libraries present in the classpath. For example, if you prefer Gson over Jackson, you can exclude Jackson and include Gson in your project: Spring Boot allows you to integrate with third-party JSON libraries if needed. Using Gson with JSON Serialization/Deserialization Similarly, when JSON data is received in a request, Spring Boot automatically converts it into the corresponding Java object. When a Java object needs to be sent as a JSON response, Jackson automatically converts it into a JSON representation. In Spring Boot, Jackson is the preferred and default library for JSON serialization and deserialization. Spring Boot provides integration for the following JSON mapping libraries: We will delve into various aspects, including serialization, deserialization, customization, and the integration of third-party libraries for handling JSON. Learn to create Spring Boot REST services that accept the requests and produce the responses in JSON format.
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