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Le cadre Spring MVC nous permet d'exécuter des validations personnalisées. Dans ce cas, nous déclarons nos propres annotations. Nous pouvons effectuer des validations en fonction de notre logique métier.
Dans cet exemple, nous utilisons à la fois les annotations prédéfinies et les annotations personnalisées pour valider les entrées utilisateur.
pom.xml
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.1.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper --> <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>tomcat-jasper</artifactId> <version>9.0.12</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>3.0-alpha-1</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.servlet/jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator --> <dependency> <groupId>org.hibernate.validator</groupId> <artifactId>hibernate-validator</artifactId> <version>6.0.13.Final</version> </dependency>
Employee.java
package com.w3codebox;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import com.w3codebox.customvalidation.Password;
public class Employee {
private String name;
//Annotation personnalisée
@Password
private String password;
//Prédefinie annotation
@Min(value=18, message="must be equal or greater than 18)
@Max(value=45, message="must be equal or less than 45)
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
EmployeeController.java
package com.w3codebox;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class EmployeeController {
@RequestMapping("/hello
public String showForm(Model theModel) {
theModel.addAttribute("emp", new Employee());
return "viewpage";
}
@RequestMapping("/helloagain
public String processForm(
@Valid @ModelAttribute("emp") Employee emp,
BindingResult br) {
if (br.hasErrors()) {
return "viewpage";
}
else {
return "final";
}
}
}
Password.java
package com.w3codebox.customvalidation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Constraint(validatedBy = PasswordConstraintValidator.class)
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Password {
//message d'erreur
public String message() default "must contain jtp";
//représente un groupe de contraintes
public Class<?>[] groups() default {};
//représente des informations supplémentaires sur l'annotation
public Class<? extends Payload>[] payload() default {};
}
PasswordConstraintValidator.java
package com.w3codebox.customvalidation;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
public class PasswordConstraintValidator implements ConstraintValidator<Password,String> {
public boolean isValid(String s, ConstraintValidatorContext cvc) {
boolean result=s.contains("jtp");
return result;
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>SpringMVC</display-name> <servlet <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
spring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- Provide support for component scanning --> <context:component-scan base-package="com.w3codebox" /> <!--Provide support for conversion, formatting and validation --> <mvc:annotation-driven/> <!-- Define Spring MVC view resolver --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
index.jsp
<html> <body> <a href="hello">Click here...</a>/a> </body> </html>
viewpage.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<style>
.error {color:red}
</style>
</head>
<body>
<form:form action="helloagain" modelAttribute="emp">
Nom d'utilisateur: <form:input path="name"} />
<br><br>
Mot de passe (*): <form:password path="password" />
<form:errors path="password" cssClass="error" />
<br><br>
Âge (*): <form:input path="age" />
<form:errors path="age" cssClass="error" />
<br><br>
<input type="submit" value="Soumettre" />
</form:form>
</body>
</html>
final.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<body>
Nom d'utilisateur: ${emp.name}<br><br>
Mot de passe: ${emp.password}<br><br>
Âge: ${emp.age}
<br><br>
</body>
</html>
Sortie:
Ici, lorsque nous saisissons le mot de passe, nous n'avons pas besoin de saisir la séquence "jtp".
Maintenant, le mot de passe que nous saisissons a une séquence "jtp".