我正在使用此答案中HibernateValidator指定的相等性验证表单上的两个字段“ password”和“
confirmPassword” 。以下是 约束描述符（验证器接口）。

package constraintdescriptor;

import constraintvalidator.FieldMatchValidator;
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.TYPE;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

@Target({TYPE, ANNOTATION_TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy = FieldMatchValidator.class)
@Documented
public @interface FieldMatch
{
    String message() default "{constraintdescriptor.fieldmatch}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};

    /**
     * @return The first field
     */
    String first();

    /**
     * @return The second field
     */
    String second();

    /**
     * Defines several <code>@FieldMatch</code> annotations on the same element
     *
     * @see FieldMatch
     */
    @Target({TYPE, ANNOTATION_TYPE})
    @Retention(RUNTIME)
    @Documented
    public @interface List{
        FieldMatch[] value();
    }
}

以下是 约束验证器 （实现类）。

package constraintvalidator;

import constraintdescriptor.FieldMatch;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import org.apache.commons.beanutils.BeanUtils;

public final class FieldMatchValidator implements ConstraintValidator<FieldMatch, Object>
{
    private String firstFieldName;
    private String secondFieldName;

    public void initialize(final FieldMatch constraintAnnotation) {
        firstFieldName = constraintAnnotation.first();
        secondFieldName = constraintAnnotation.second();
        //System.out.println("firstFieldName = "+firstFieldName+"   secondFieldName = "+secondFieldName);
    }

    public boolean isValid(final Object value, final ConstraintValidatorContext cvc) {
        try {
            final Object firstObj = BeanUtils.getProperty(value, firstFieldName );
            final Object secondObj = BeanUtils.getProperty(value, secondFieldName );
            //System.out.println("firstObj = "+firstObj+"   secondObj = "+secondObj);
            return firstObj == null && secondObj == null || firstObj != null && firstObj.equals(secondObj);
        }
        catch (final Exception e) {
            System.out.println(e.toString());
        }
        return true;
    }
}

以下是与JSP页面映射的验证器bean（commandName="tempBean"由<form:form></form:form>标记指定）。

package validatorbeans;

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

@FieldMatch.List({
    @FieldMatch(first = "password", second = "confirmPassword", message = "The password fields must match", groups={TempBean.ValidationGroup.class})
})

public final class TempBean
{        
    @NotEmpty(groups={ValidationGroup.class}, message="Might not be left blank.")
    private String password;
    @NotEmpty(groups={ValidationGroup.class}, message="Might not be left blank.")
    private String confirmPassword;

    public interface ValidationGroup {};

    //Getters and setters                
}

更新

一切正常，并按预期进行验证。剩下的一件事就是在未显示的TempBean类上方显示指定的错误消息，@FieldMatch即 只有一个问题：
发生验证冲突时如何在JSP页面上显示错误消息？

（注释@NotEmpty两个字段password，并confirmPassword在TempBean类的作品，并显示指定的消息上违规的事情是不是发生@FieldMatch）。

我正在根据此博客中指定的此问题使用 验证组
，它运行良好，不会导致显示错误消息时出现中断（看起来好像是这样）。

在JSP页面上，这两个字段的指定如下。

<form:form id="mainForm" name="mainForm" method="post" action="Temp.htm" commandName="tempBean">

    <form:password path="password"/>
    <font style="color: red"><form:errors path="password"/></font><br/>

    <form:password path="confirmPassword"/>
    <font style="color: red"><form:errors path="confirmPassword"/></font><br/>

</form:form>