spring - 没有强制执行表单输入约束？

Question

我是 Tomcat 和 Spring Web 的新手。我正在尝试通过以下方式使用 Spring 的表单验证功能 this tutorial .一切似乎都运行顺利，除了一件事......我的表单没有进行任何验证，无论我提供什么数据，当我发送表单时我总是可以到达成功页面。

我是否正确使用了约束？我想强制用户填写他们的名字，并且名字至少包含两个字符。

package net.devmanuals.form;

import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.NotEmpty;

public class RegistrationForm {
    @NotEmpty(message = "You surely have a name, don't you?")
    @Size(min = 2, message = "I'm pretty sure that your name consists of more than one letter.")
    private String firstName;

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getFirstName() {
        return this.firstName;
    }
}

表单代码:

    <form:form method="post" commandName="regform">
        <p><form:input path="firstName" /> <form:errors path="firstName" /></p>
        <p><input type="submit" /></p>
    </form:form>

Controller :

@Controller
@RequestMapping("/register")
public class RegistrationController {
    @RequestMapping(method = RequestMethod.GET)
    public String showRegForm(Map model) {
        RegistrationForm regForm = new RegistrationForm();
        model.put("regform", regForm);
        return "regform";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String validateForm(@Valid RegistrationForm regForm, BindingResult result, Map model) {
        if (result.hasErrors()) {
            return "regform";
        }

        model.put("regform", regForm);
        return "regsuccess";
    }
}

我是否错误地应用了约束？

Answer 1

除了添加<mvc:annotation-driven/>对于您的配置，您需要确保 JSR-303 jar 在您的类路径中。来自docs :

[AnnotationDrivenBeanDefinitionParser] ... configures the validator if specified, otherwise defaults to a fresh Validator instance created by the default LocalValidatorFactoryBean if the JSR-303 API is present on the classpath.