International support of Java Ee Validation framework
Java Ee Validation (Java Enterprise Verification) is a framework for performing verification in Java Ee applications.It allows developers to define verification rules for the application of the application using annotations and verifications.Java Ee Validation provides a convenient way to ensure that the application receives effective and correctly formatted data.
When developing multi -language applications, international support is very important.It allows the application to automatically display the corresponding translation text according to the user's language and region.The Java Ee Validation framework also provides international support for internationalization so that developers can use texts in different languages in verifying errors.
To achieve international support in the Java Ee value framework, we need to take the following steps:
1. Create resource files for storing error messages.We can create multiple resource files, each file corresponds to one language.Generally, the extension of the resource file is `.properties`.The following is a sample resource file `validationMessages.properties`:
properties
email.invalid = invalid email address
2. Define the key value pair in the resource file, where the key is to verify the wrong constraint annotation.
3. Use the Java code annotation verification rule and specify the key message.For example, we can use the@email` annotation to verify the email address and set the error message key to `email.invalid`.Code example:
import javax.validation.constraints.Email;
import javax.validation.constraints.NotNull;
public class User {
@NotNull
private String name;
@Email(message = "{email.invalid}")
private String email;
// Getter and setter methods
}
4. When verifying the error message, the Java Ee Validation framework will automatically find resource files that match the user's language and use the corresponding translation text.Suppose the user's language is set to Chinese. When the email address fails, the error message will be displayed as "an invalid email address".
In this way, we realize the international support for the Java Ee Validation framework.
Summarize:
Java Ee Validation provides a convenient way to verify input data.When developing multi -language applications, international support is crucial.By using resource files and specifying the error message key in the verification rules, we can achieve international support for the Java Ee value framework.
For reference code, please refer to the following example:
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.Set;
public class Main {
public static void main(String[] args) {
// Set the language environment as Chinese
Locale.setDefault(Locale.CHINA);
// Create a verification device
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
// Create a user object
User user = new User();
user.setName(null);
user.setEmail("invalid_email");
// Verify user object
Set<ConstraintViolation<User>> violations = validator.validate(user);
// Get the error message
ResourceBundle messages = ResourceBundle.getBundle("ValidationMessages");
for (ConstraintViolation<User> violation : violations) {
String errorMessage = messages.getString(violation.getMessage());
System.out.println(errorMessage);
}
}
}
Note: In order to make international support for normal work, the validationMessages.properties need to be placed under the class path of the project.
