Spring 3 基于注解的验证:密码和确认密码
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【中文标题】Spring 3 基于注解的验证:密码和确认密码【英文标题】:Spring 3 annotation-based validation: password and confirm password 【发布时间】:2011-11-06 13:58:03 【问题描述】:在我的 Spring 3 MVC 应用程序中,用户需要保存密码,如果他们还能够在保存时确认密码,这将是一个不错的功能。
在 bean 中,我使用基于注释的验证。是否有可用于执行此检查的注释验证器?
经过一番谷歌搜索后,我找到了这个博客:http://gochev.blogspot.com/2010/06/spring-mvc-spring-bean-validation.html。但我想我在这里缺少一个 jar-lib,因为 Eclipse 无法找到/建议任何 jar。有人知道我需要什么罐子才能工作吗?
提前谢谢:)
【问题讨论】:
【参考方案1】:Cyril Deba 提供的公认解决方案也对我有用。但是后来我不得不为 ResetPassword 和 ChangePassword Page 做另一个注释,因为它们有不同的 DTO。为了克服这个问题,我将 isValid 更改为以下代码。虽然也可以通过实现接口来实现,但我认为这个更现实。希望它会有所帮助。
@Override
public boolean isValid(Object candidate, ConstraintValidatorContext context)
try
Method methodGetPassword = candidate.getClass().getMethod("getPassword");
Method methodGetConfirmpassword = candidate.getClass().getMethod("getConfirmpassword");
if(methodGetPassword.invoke(candidate) == null && methodGetConfirmpassword.invoke(candidate)==null)
return true;
else if(methodGetPassword.invoke(candidate) == null )
return false;
return methodGetPassword.invoke(candidate).equals(methodGetConfirmpassword.invoke(candidate));
catch (NoSuchMethodException ex)
ex.printStackTrace();
return false;
catch (Exception ex)
ex.printStackTrace();
return false;
【讨论】:
【参考方案2】:我写了以下代码来验证密码:
约束实现:
package com.test.web.validation.user;
import java.lang.annotation.Documented;
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;
@Target( ElementType.TYPE )
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy = PasswordsEqualConstraintValidator.class)
public @interface PasswordsEqualConstraint
String message();
Class<?>[] groups() default ;
Class<? extends Payload>[] payload() default ;
package com.test.web.validation.user;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import com.test.logic.dto.UserDto;
public class PasswordsEqualConstraintValidator implements
ConstraintValidator<PasswordsEqualConstraint, Object>
@Override
public void initialize(PasswordsEqualConstraint arg0)
@Override
public boolean isValid(Object candidate, ConstraintValidatorContext arg1)
UserDto user = (UserDto) candidate;
return user.getPassword().equals(user.getPasswordRepeat());
我的 DTO 对象:
package com.test.logic.dto;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import com.esldic.web.validation.user.EmailExistsConstraint;
import com.esldic.web.validation.user.PasswordsEqualConstraint;
@PasswordsEqualConstraint(message = "passwords are not equal")
public final class UserDto extends AbstractDto implements Serializable
private static final long serialVersionUID = 1L;
private Long id;
@NotNull
@Size(min = 3, max = 30)
@EmailExistsConstraint(message = "email is not available")
private String email;
private String username;
@NotNull
@Size(min = 2, max = 30)
private String password;
@NotNull
@Size(min = 2, max = 30)
private String passwordRepeat;
...
最后,我的控制器
package com.test.web.controllers;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.test.logic.dto.UserDto;
@Controller
public final class SignupController
@Autowired
private Validator validator;
@RequestMapping(value = "/signup.html", method = RequestMethod.POST)
public @ResponseBody
ModelAndView handleSignupForm(@ModelAttribute UserDto candidate,
HttpServletResponse response) throws ServiceException
Set<ConstraintViolation<UserDto>> failures = validator
.validate(candidate);
if (!failures.isEmpty())
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return ValidationHelper.validationMessages(failures);
else
return userService.create(candidate);
另外,在 google 中你会发现很多带有 JSR-303 bean 验证的示例。
【讨论】:
【参考方案3】:您需要 Hibernate Validation 和 JSR 303 Api jar。
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.1.0.Final</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency>
http://mvnrepository.com/artifact/org.hibernate/hibernate-validator
http://mvnrepository.com/artifact/javax.validation/validation-api/1.0.0.GA
看到这个问题:Cross field validation with Hibernate Validator (JSR 303)
有几种方法可以解决这个问题。
【讨论】:
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