spring - 如何在 Spring 4 中开启注解驱动验证？

Question

我正在使用如下注释验证:

    public String processRegistration(@Valid Spitter spitter, Errors errors,
            Model model) {
        if (errors.hasErrors()) {
            return "registerForm";
        }
        ...
      }

但是 errors.hasErrors() 总是返回 false。我想我没有为注释驱动的验证打开某种开关。但是我如何在 Spring 4 中使用 JavaConfig 来实现呢？我尝试将 @AnnotationDrivenConfig 应用于配置类，但该类型甚至无法解析。

加1

我已经在 servlet-context.xml 中进行了以下配置，但仍然不起作用。

<annotation-driven />

添加 2

spitter.java:

package com.learnspring.mvc.web;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.hibernate.validator.constraints.Email;

public class Spitter {

    private Long id;

    @NotNull
    @Size(min = 5, max = 16)
    private String username="default name";

    @NotNull
    @Size(min = 5, max = 25)
    private String password;

    @NotNull
    @Size(min = 2, max = 30)
    private String firstName;

    @NotNull
    @Size(min = 2, max = 30)
    private String lastName;

    @NotNull
    @Email
    private String email;

    public Spitter() {
    }

    public Spitter(String username, String password, String firstName,
            String lastName, String email) {
        this(null, username, password, firstName, lastName, email);
    }

    public Spitter(Long id, String username, String password, String firstName,
            String lastName, String email) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

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

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public boolean equals(Object that) {
        return EqualsBuilder.reflectionEquals(this, that, "firstName",
                "lastName", "username", "password", "email");
    }

    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this, "firstName",
                "lastName", "username", "password", "email");
    }

}

SpitterController.java

package com.learnspring.mvc.web;

import static org.springframework.web.bind.annotation.RequestMethod.*;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.learnspring.mvc.web.Spitter;
import com.learnspring.mvc.web.SpitterRepository;

@Controller
@RequestMapping("/spitter")
public class SpitterController {

    private SpitterRepository spitterRepository;

    @Autowired
    public SpitterController(SpitterRepository spitterRepository) {
        this.spitterRepository = spitterRepository;
    }

    @RequestMapping(value = "/register", method = GET)
    public String showRegistrationForm(Model model) {
        model.addAttribute("spitter", new Spitter());

        return "registerForm";
    }

    @RequestMapping(value = "/register", method = POST)
    public String processRegistration(@Valid Spitter spitter,
            Errors errors, Model model) {


        if (errors.hasErrors()) {
            return "registerForm";
        }

        if (spitter == null) {
            model.addAttribute("ufo", "spitter is null!");
            model.addAttribute("mark", "MARKER");
            return "forward:/spitter/spitter/registerFail";
        }

        else if (!spitter.getUsername().contains("ufo")) {
            model.addAttribute("ufo", "spitter user name is not ufo!!");
            model.addAttribute("mark", "MARKER:" + spitter.getUsername());
            model.addAttribute("pwd", "MARKER:" + spitter.getPassword());
            return "forward:/spitter/spitter/registerFail";
        }

        else
            return "redirect:/spitter/spitter/registerOK";

    }

    @RequestMapping(value = "/{username}", method = GET)
    public String showSpitterProfile(@PathVariable String username, Model model) {
        Spitter spitter = spitterRepository.findByUsername(username);
        model.addAttribute(spitter);
        return "profile";
    }

    @RequestMapping(value = "/spitter/registerOK", method = GET)
    public String showRegisterOK() {
        return "registerOK";
    }

    @RequestMapping(value = "/spitter/registerFail", method = POST)
    public String showRegisterFail() {
        return "registerFail";
    }

}

registerForm.jsp:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="f" %>
<%@ page session="false" %>
<html>
  <head>
    <title>Spitter</title>
    <link rel="stylesheet" type="text/css" 
          href="<c:url value="/resources/style.css" />" >
  </head>
  <body>
    <h1>Register</h1>

    <f:form method="POST" commandName="spitter">
      f:First Name: <f:input path="firstName" /><br/>
      f-Last Name: <f:input path="lastName" /><br/>
      f-Email: <f:input path="email" /><br/>
      f-User Name: <f:input path="username" /><br/>
      f-Password: <f:input path="password" /><br/>
      <input type="submit" value="Register" />
    </f:form>
  </body>
</html>

WebConfig.java:

package com.learnspring.mvc.web;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@EnableWebMvc
@ComponentScan("com.learnspring.mvc.web")
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(
            DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // TODO Auto-generated method stub
        super.addResourceHandlers(registry);
    }

}

RootConfig.java

package com.learnspring.mvc.config;

import java.util.regex.Pattern;

import com.learnspring.mvc.config.RootConfig.WebPackage;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Import;
import org.springframework.core.type.filter.RegexPatternTypeFilter;

@Configuration
@ComponentScan(basePackages = { "com.learnspring.mvc" }, excludeFilters = { @Filter(type = FilterType.CUSTOM, value = WebPackage.class) })
public class RootConfig {
    public static class WebPackage extends RegexPatternTypeFilter {
        public WebPackage() {
            super(Pattern.compile("com.learnspring.mvc\\.web"));
        }
    }
}

SpitterWebInitialization.java

package com.learnspring.mvc.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import com.learnspring.mvc.config.RootConfig;
import com.learnspring.mvc.web.WebConfig;

public class SpitterWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

  @Override
  protected Class<?>[] getRootConfigClasses() {
    return new Class<?>[] { RootConfig.class };
  }

  @Override
  protected Class<?>[] getServletConfigClasses() {
    return new Class<?>[] { WebConfig.class };
  }

  @Override
  protected String[] getServletMappings() {
    return new String[] { "/" };
  }

}

添加 3

还有 web.xml:(实际上，所有内容都被注释掉了。)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <!--
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>
    </context-param>
      -->
    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <!-- 
    <listener>
          <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
     -->

    <!-- Processes application requests -->
    <!--
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    -->

</web-app>

Answer 1

根据您的解释和以下错误判断 java.lang.ClassNotFoundException: javax.validation.Validator Spring 看不到这些类，因此不会启用 JSF-303 验证。

确保正确的 jars 在类路径中，并且你也有一个实现。使用 Maven 时，添加如下内容应该可以解决问题。

<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>1.1.0.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.1.3.Final</version>
</dependency>

这会将所需的 jar 添加到 WEB-INF/lib 目录，这反过来让 Spring Web MVC 检测它并配置适当的 bean。

有关不同注释的解释，您可能需要查看 In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank? .