The steps and precautions for integrated Hibernate Validator Engine RELOCATION Artifact in Java project
The steps and precautions for integrated Hibernate Validator Engine RELOCATION Artifact in Java project
Hibernate Validator is an open source framework for verifying Java Bean, which is the implementation of the JSR-380 specification (Bean Validation 2.0).By using Hibernate Validator, you can easily verify the attributes of Java Bean.This article will introduce the steps and matters that need attention to integrate Hibernate Validator Engine Relocation Artifact in the Java project.
step:
1. Add dependencies
First, you need to add Hibernate Validator to the project.You can add the following dependencies in the construction file of the project (such as Maven or Gradle):
Maven:
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.2.0.Final</version>
</dependency>
Gradle:
groovy
implementation 'org.hibernate.validator:hibernate-validator:6.2.0.Final'
2. Introduce RELOCATION Artifact dependence
With the help of the RELOCATION Artifact function, you can re -position the Hibernate Validator class under the custom package name to avoid conflicting with other dependent packages.In the construction document of the project, you can add the following dependence:
Maven:
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator-engine</artifactId>
<version>6.2.0.Final</version>
<scope>runtime</scope>
</dependency>
Gradle:
groovy
runtimeOnly 'org.hibernate.validator:hibernate-validator-engine:6.2.0.Final'
3. Create a Custom Constraint Validator
If you need to create a custom verification device, you can implement the `javax.validation.constraintValidator` interface, and use the`@constraintValidator` annotations on the implementation class.The following is an example:
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
public class CustomConstraintValidator implements ConstraintValidator<CustomConstraint, String> {
@Override
public void initialize(CustomConstraint constraint) {
// Initialize the verification device
}
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
// Verification logic
}
}
4. Use Hibernate Validator to verify
Use the annotations provided by Hibernate Validator on your Java Bean class to define the verification rules.Here are some examples of notes:
-`@notnull`: The value of the attribute cannot be empty
-`@Size (min = 2, max = 10)`: The length of the attribute must be between 2 and 10
-` `@Pattern (regexp =" [a-za-z0-9]+")` `` `: The attribute must match the specified regular expression
public class User {
@NotNull
@Size(min=2, max=10)
private String username;
@Pattern(regexp="[a-zA-Z0-9]+")
private String password;
// getter and setter method
}
When you need to verify, you can use the `javax.validation.Validation` class to create a` javax.validation.Validator` instance, and perform verification by calling the `value () method.The following is an example:
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import javax.validation.ConstraintViolation;
public class Main {
public static void main(String[] args) {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
User user = new User();
user.setUsername("admin");
user.setPassword("password123");
Set<ConstraintViolation<User>> violations = validator.validate(user);
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
factory.close();
}
}
Precautions:
1. You need to ensure that the Hibernate Validator version you use is consistent with the dependency version you added.
2. When using Hibernate Validator, make sure you understand and obey the requirements for verification specifications and constraints used by you.
3. If you need to create a custom verification device, it is recommended to add `@constraintValidator` to the implementation class, and implement the method of` initialize () and `iSvalid ()` in the interface definition.
4. When using Hibernate Validator to verify the attribute, if there is a violation of constraints, a collection of a `Constraintvilation` will be returned. You can obtain the corresponding verification error information by iterating.
By integrating the Hibernate Validator Engine Relocation Artifact above the above steps, you can easily use the Hibernate Validator in the Java project to verify, and you can solve the problem of dependent package conflict through the RELOCATION Artifact.
