spring boot3.0 custom verification annotations and take article status verification as an example

Spring Boot Custom Verification Annotations: Status Verification Example

This article introduces in detail how to customize verification annotations in Spring Boot, and explains them with status verification as an example, striving to be concise and clear, easy to understand and practice.

In practical applications, standard annotation verification may not meet all needs, especially when dealing with some special verification scenarios. For example, it may be necessary to perform complex combination verification of fields based on business logic, or to dynamically determine verification rules at runtime. In this case, using existing annotation verification seems ineffective. Therefore, we can achieve more flexible and accurate verification logic through custom verification annotations. This not only improves the readability and maintainability of the code, but also enables our applications to better cope with various complex business needs.

Here is the "Create"StateCreation and teaching of the Annotation section

1. Create @State annotation

In existing Spring Boot projects, we may need to implement some business-specific verification logic, such as ensuring that the state value of a field meets specific conditions. To do this, we can create a custom oneStateannotation. This annotation will be used to identify the state of a field and ensure the legality and validity of its value through custom verification logic.

step:

1. Create custom annotations:

In the right location of the project (e.g.Package), create a new oneStateAnnotation class. The annotation may receive multiple parameters, such as allowed state values.

package ;
import ;
import ;
import ;
import .*;
@Documented//Metal Annotation@Target( )
@Retention()
@Constraint(validatedBy = {})
public @interface State {
    String message() default "The state parameter can only be draft or published";
    Class&lt;?&gt;[] groups() default {};
    //Load Get additional information about State annotations    Class&lt;? extends Payload&gt;[] payload() default {};
}

2. Implement verification logic:

Create a name calledStateValidatorclass, implementationConstraintValidator<State, String>interface. Define specific verification logic in this class to verify that the value of the field is in the allowed state value.

package ;
import ;
import ;
import ;
public class StateValidation implements ConstraintValidator&lt;State,String&gt; {
    /**
     *
     * @param s
     * @param constraintValidatorContext
     * @return
     */
    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
        if(s == null){
            return false;
        }
        if(("Published") || ("draft")){
            return true;
        }
        return false;
    }
}

2. Implement custom verification

step:

1. Use custom verification annotations in entity classes @State:

In our entity classes, it is often necessary to add constraints to certain fields to ensure that their values meet the requirements of business logic. To apply what we just created@StateCustom annotation, we need to add this annotation on the fields that need to be checked for status.

2. Add @State annotation:

Added on the declaration of the corresponding field@StateAnnotation, specify the legal status value. For example, suppose we have aArticleEntity class, one of themstatusFields represent the status of the article:

import ;
import ;
import ;
import ;
import ;
import ;
import ;
@Data
public class Article {
    private Integer id;//Primary key ID    @URL
    private String coverImg;//Cover image    @State
    private String state;//Release Status Published | Draft    @NotNull
    private Integer categoryId;//Article category id    private Integer createUser;//Creator ID    private LocalDateTime createTime;//Creation time    private LocalDateTime updateTime;//Update time}

Summarize

In this tutorial, we dive into how to create and implement custom verification annotations in Spring Boot. Through custom@StateAnnotation, we can flexibly and accurately verify the field status according to specific business needs. This method not only improves the readability and maintainability of the code, but also makes the verification logic clearer and clearer.

Review of main steps:

Create custom annotations: We first defined@StateAnnotation and use@ConstraintAnnotation is marked as a verification annotation. In addition, with the help of a custom validatorStateValidation, realizes specific verification logic.
Implement verification logic: By implementingConstraintValidatorInterface, defines valid state values (e.g."Published"and"draft") and inisValidThe corresponding verification mechanism is implemented in the method to ensure that the field value is legal.
Apply custom verification: In the entity class, we apply custom annotations to fields that require state verification. For example,ArticleIn the class,stateFields are used@Stateannotation to ensure that its value complies with predefined rules.

Advantages

flexibility: The verification logic can be flexibly customized according to specific business needs to meet the needs of complex scenarios.
readability: Clearly express the verification intention through annotations, reduce redundant boilerplate code, and enhance the comprehensibility of the code.
Maintainability: The centralized verification logic facilitates subsequent modification and expansion, improving the maintainability of the code.

By learning and practicing custom verification annotations, we will be able to more effectively respond to the complex needs of the application, improve the overall code quality, and show stronger competitiveness in complex business scenarios. I hope this example can be helpful to your project. If you need an in-depth understanding, please feel free to ask questions in the comment area!

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