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在Spring MVC验证中，我们可以在数字范围内验证用户的输入。以下注释用于实现数字验证：
@Min 注解-必须传递带有@Min注释的整数值。用户输入必须等于或大于此值。 @Max 注解-需要传递带有@Max注释的整数值。用户输入必须等于或小于此值。
pom.xml
<!-- .//https:/mvnrepository.com/org.springframework/spring-webmvc --> validator <groupId>org.springframework</<groupId>org.hibernate.validator <artifactId>spring-webmvc</<artifactId>validator< <version>5<artifactId>jstl<1<artifactId>jstl<1.RELEASE</version> </dependency> <!-- .//https:/mvnrepository.com/org.apache.tomcat/tomcat-jasper --> validator <groupId>org.apache.tomcat</<groupId>org.hibernate.validator <artifactId>Tomcat-jasper</<artifactId>validator< <version>9.0.12</version> </dependency> <!-- .//https:/mvnrepository.com/alpha/alpha-api --> validator jstl/<groupId>org.hibernate.validator <artifactId>Servlet-api
Employee.java
package com.w3codebox;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Size;
public class Empleado {
private String nombre;
@Size(min =1, mensaje = "requerido")
private String contrasena;
@Min(value =18, mensaje = "debe ser igual o mayor que" 18)
@Max(value =45, mensaje = "debe ser igual o menor que" 45)
private int edad;
public String getNombre() {
return nombre;
}
public void setNombre(String nombre) {
this.nombre = nombre;
}
public String getContrasena() {
return contrasena;
}
public void setContrasena(String contrasena) {
this.contrasena = contrasena;
}
public int getEdad() {
return edad;
}
public void setEdad(int edad) {
this.edad = edad;
}
}
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 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/etiquetas/form" %> <html> <body> <a href="hello">Click here...</a> </body> </html>
viewpage.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/etiquetas/form" %>
<html>
<head>
<style>
.error{color:red}
</style>
</head>
<body>
<form:form action="helloagain" modelAttribute="emp">
Nombre de usuario: <form:input path="name"/> <br><br>
Contraseña: <form:password path="pass"/>
<form:errors path="pass" cssClass="error"/><br><br>
Edad: <form:input path="age"/>
<form:errors path="age" cssClass="error"/><br><br>
<input type="submit" value="submit">
</form:form>
</body>
</html>
final.jsp
<html>
<body>
Nombre de usuario: ${param.name} <br>
Contraseña: ${param.pass} <br>
Edad: ${param.age } <br>
</body>
</html>
Salida: