Introduction to Jersey Ext Bean Validation in Java Library

Jersey is an open source framework for building the RESTFUL Web service. It is one of the most popular frameworks in the Java class library.Jersey Ext Bean Validation is an extension module of the Jersey framework, which provides support for Bean Validation specifications. Bean Validation is a specification introduced by Java Ee 6 to verify the attributes of the Java object.This specification defines a set of annotations. Developers can use these annotations to declare verification rules and verify the Java objects when they need to be verified.Bean Validation can run on the client and server and can be used at any level. Using Jersey Ext Bean Validation in the Jersey framework can easily verify the request body and response of the RESTFUL Web service.The following is a simple example that shows how to use Bean Validation in Jersey for verification of request parameters: @Path("users") public class UserResource { @POST @Consumes(MediaType.APPLICATION_JSON) public Response createUser(@Valid User user) { // Processing the logic of creating users return Response.ok("User created").build(); } } public class User { @NotNull private String name; @Email private String email; // omit the getter and setter method } In the above example, we define a RESTFUL resource class called UserResource, where the Createuser method is accepted as a User object using @Valid annotation mark as parameters.This @Valid annotation tells the Jersey framework to verify this User object.The name attribute in the User class uses @Notnull annotations for non -air verification, and the email attribute uses @EMAIL annotations for email format verification. When the client sends a post request to create a user, the Jersey framework will automatically verify the User object in the request body.If the verification fails, Jersey will return a 400 Bad Request response and carry detailed error information at the same time. In addition to using @valid annotations in the resource class to verify, Jersey also provides other methods to use Bean Validation.You can use the annotations provided by Bean Validation in the method parameter, method return value, and the response to the resource -based method parameters. To sum up, Jersey Ext Bean Validation provides developers with a simple and powerful way to verify the request and response of the RESTFUL Web service.It combines the advantages of the Jersey framework and Bean Validation, enabling developers to more conveniently write a safe and reliable web service.