The best practice of using the Java Ee Validation framework for data verification
Java Ee Validation is a powerful framework provided by the Java Ee platform to verify the input data.It provides a set of annotations and verificationrs that allow developers to easily define and implement data verification rules.This article will introduce the best practice of using the Java Ee Validation framework for data verification, and provide some example code.
1. Introduction to dependencies
First of all, we need to introduce Java Ee Validation's dependency library in the pom.xml file of the project.Here are related Maven configurations:
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.2.0.Final</version>
</dependency>
2. Define the verification rules
Using Java Ee Validation, we can define the verification rules by adding annotations to the field of the physical class.Here are some commonly used annotations:
1. @Notnull: The field value cannot be empty.
2. @size: The length of the string must be within the specified range.
3. @email: The field must be an effective mailbox address.
4. @Pattern: The field must match the specified regular expression.
5. @min and @Max: The field must be greater than or equal to the specified value.
6. @Asserttrue and @AssertFalse: The field must be true or false.
The following is a definition of a sample entity class, which contains the use of the above annotations:
public class User {
@NotNull
@Size(min = 2, max = 20)
private String username;
@NotNull
@Email
private String email;
@Pattern(regexp = "\\d{3}-\\d{8}")
private String phoneNumber;
// omit the getter and setter method
}
3. Perform data verification
Once the verification rules are defined, we can use the Java Ee Validation verification device to perform data verification.The following is a simple example:
public class ValidatorExample {
public static void main(String[] args) {
ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
Validator validator = validatorFactory.getValidator();
User user = new User();
user.setUsername("abc");
user.setEmail("abc@example.com");
user.setPhoneNumber("12345678");
Set<ConstraintViolation<User>> violations = validator.validate(user);
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
}
}
In the above examples, we first created a validator instance.Then, a user object was created, and the fields were given some values that did not meet the verification rules.Finally, we use the validator.Validate () method to perform data verification, and obtain the information of the failed failed through the traversal results set.
4. Processing verification results
Java Ee Validation returns a collection of Constraintvilation, where each Constraintviolation contains the field name and corresponding error messages that verify failed.Developers can customize the logic according to actual needs.For example, the error message can be displayed to the user, or the verification results can be saved into the log.
summary
This article introduces the best practice of using Java Ee Validation for data verification.By defining verification rules and execution data verification, we can easily verify the input data to ensure the legitimacy of the data.Java Ee Validation provides a set of annotations and verifications that make the verification code writing simple and efficient.I hope this article can help readers better understand and use the Java Ee Validation framework.
