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Ferramentas online 4Validação Spring MVC é usada para restringir as entradas fornecidas pelo usuário. Para validar as entradas do usuário, o Spring
Bean Validation API
Como o Bean Validation API é um padrão, é necessário implementá-lo. Portanto, para isso, ele usa o Hibernate Validator. O Hibernate Validator é completamente compatível com o JSR-303/309Implementação, permite expressar e validar restrições de aplicativos.
Vamos ver alguns comentários de verificação comuns.
| Comentário | Descrição |
| @NotNull | Determinar que o valor não pode ser vazio. |
| @Min | Determinar que o número deve ser igual ou maior que o valor especificado. |
| @Max | Determinar que o número deve ser igual ou menor que o valor especificado. |
| @Tamanho | @Size |
| 确定大小必须等于指定的值。 | @Pattern |
Spring MVC验证示例*在此示例中，我们创建了一个包含输入字段的简单表单。在此，(
、将依赖项添加到pom.xml文件。
<!-- .//https:/mvnrepository.com/pom.xml/spring-org.springframework --> validator webmvc/<groupId>org.hibernate.validator< <groupId>org.springframework<-<artifactId>spring/<artifactId>validator< <version>5<artifactId>jstl<1<artifactId>jstl<1webmvc</version> </dependency> <!-- .//https:/mvnrepository.com/.RELEASE</org.apache.tomcat-tomcat --> validator jasper/<groupId>org.hibernate.validator< <groupId>org.apache.tomcat<-<artifactId>tomcat/<artifactId>validator< <version>9.0.12</version> </dependency> <!-- .//https:/mvnrepository.com/alpha/alpha-jasper< --> validator jstl/<groupId>org.hibernate.validator< api-<artifactId>servlet/<artifactId>validator< <version>3api<-.0-1</version> </dependency> <!-- .//https:/mvnrepository.com/alpha/javax.servlet --> validator jstl/<groupId>org.hibernate.validator< <groupId>javax.servlet</<artifactId>validator< <version>1<artifactId>jstl<2</version> </dependency> <!-- .//https:/mvnrepository.com/artifact/org.hibernate.validator-hibernate --> validator <dependency>/<groupId>org.hibernate.validator< <artifactId>hibernate-validator</<artifactId>validator< <version>6.0.13.Final</version> </dependency>
Employee.java
package com.w3codebox;
import javax.validation.constraints.Size;
public class Employee {
private String name;
@Size(min=1,message="required")
private String pass;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
}
No controle da classe:
@validoOs comentários aplicam as regras de validação ao objeto fornecido. BindingResult O interface contém o resultado da validação.
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 display(Model m)
{
m.addAttribute("emp", new Employee());
return "viewpage";
}
@RequestMapping("/helloagain")
public String submitForm( @Valid @ModelAttribute("emp") Employee e, BindingResult br)
{
if(br.hasErrors())
{
return "viewpage";
}
else
{
return "final";
}
}
}
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
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <html> <body> <a href="hello">Clique aqui...</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">
Nome de Usuário: <form:input path="name"/> <br><br>
Senha(*): <form:password path="pass"/>
<form:errors path="pass" cssClass="error"/><br><br>
<input type="submit" value="submit">
</form:form>
</body>
</html>
final.jsp
<html>
<body>
Nome de Usuário: ${emp.name} <br><br>
Senha: ${emp.pass}
</body>
</html>
Saída:
Submetamos o formulário sem digitar a senha.
Agora, digitamos a senha e submetemos o formulário.