Bean Validation SCALA framework in the Java Library

Bean value is a specification for verifying the Java Bean property.It provides a set of annotations and APIs to simplify the implementation process of data verification and help developers write more robust and reliable code.Although the main goal of Bean Validation is Java, it can also be used in the SCALA project. This article will introduce how to use the Bean Validation Scala framework in the Java library.We will discuss how to integrate the Bean Validation framework and SCALA code and provide some example code to illustrate its usage. 1. Integrated Bean Validation framework To use the Bean Validation Scala framework in the Java class library, you need to add related dependencies.You can use Maven or Gradle and other construction tools to manage project dependence. Maven dependence: <dependency> <groupId>org.hibernate.validator</groupId> <artifactId>hibernate-validator</artifactId> <version>6.2.0.Final</version> </dependency> Gradle dependencies: groovy implementation 'org.hibernate.validator:hibernate-validator:6.2.0.Final' After adding dependencies, you need to use the Bean Validation framework in the Scala class.In Scala, you can use Java's reflex API and Bean Validation annotations to achieve data verification. Second, use the Bean Validation framework 1. Define a scala class to verify: scala import javax.validation.constraints.{Min, NotBlank} case class User( @Notblank (Message = "Name cannot be empty") name: String, @Min (Value = 18, Message = "Age cannot be less than 18 years") age: Int ) The above example code defines a User class, which contains two properties: name and Age.We used the `@notblank` annotation to verify that the name attribute cannot be empty, and use the@min` annotation to verify that the AGE attribute cannot be less than 18 years old. 2. Create a verification device and perform data verification: scala import javax.validation.{Validation, Validator} val validator: Validator = Validation.buildDefaultValidatorFactory().getValidator() val user = User("", 16) val violations = validator.validate(user) violations.forEach(violation => { println(violation.getMessage) }) The above code creates a verification object and uses the `value method to verify the User object.The verification results are returned in the form of `Constraintvilation`.We can traverse the results and output the error message. 3. Summary This article introduces how to use the Bean Validation Scala framework in the Java library.First, we need to add related dependencies to integrate the Bean Validation framework.Then, we define an verified SCALA class and use annotations to specify the verification rules.Finally, we created a verification object and verified the data. By using the Bean Validation SCALA framework, we can easily verify the Bean property in the Java library, thereby improving the robustness and reliability of the code.