Hibernate 能够满足我们的验证需求

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Ted Bergeron ([email protected]), åä½åå§äºº, Triview, Inc.

2006 å¹´ 10 æ 10 æ¥

å°½ç®¡å¨ Web åºç¨ç¨åºä¸­å°½å¯è½å¤çå±æ¬¡ä¸­æ建æ°æ®éªè¯é常éè¦ï¼ä½æ¯è¿æ ·åå´é常èæ¶ï¼ä»¥è³äºå¾å¤å¼å人åé½ä¼å¹²è忽ç¥è¿ä¸ªæ­¥éª¤ ââ è¿å¯è½ä¼å¯¼è´ä»å大éé®é¢ç产çãä½æ¯éçææ°çæ¬ç Java å¹³å°ä¸­å¼å¥äºæ³¨éï¼éªè¯åå¾ç®åå¾å¤äºãå¨æ¬æ中ï¼Ted Bergeron å°åæ¨ä»ç»å¦ä½ä½¿ç¨ Hibernate Annotations ç Validator ç»ä»¶å¨ Web åºç¨ç¨åºä¸­è½»æ¾æ建并维æ¤éªè¯é»è¾ã

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æ¸å 1. ä½¿ç¨ HibernateDoclet ç Hibernate æ å°ä»£ç 
/**
 * @hibernate.property column="NAME" length="60" not-null="true"
 */
public String getName() {
    return this.name;
}

/**
 * @hibernate.many-to-one column="AGENT_ID" not-null="true" cascade="none" 
 *                        outer-join="false" lazy="true"
 */
public Agent getAgent() {
    return agent;
}
/**
 * @hibernate.set lazy="true" inverse="true" cascade="all" table="DEPARTMENT" 
 * @hibernate.collection-one-to-many class="com.triview.model.Department"
 * @hibernate.collection-key column="DEPARTMENT_ID" not-null="true"
 */
public List getDepartment() {
    return department;
}


æ¸å 2. ä½¿ç¨ Hibernate Annotations ç Hibernate æ å°ä»£ç 
@NotNull
@Column(name = "name")
@Length(min = 1, max = NAME_LENGTH) // NAME_LENGTH is a constant declared elsewhere
public String getName() {
    return name;
}

@NotNull
@ManyToOne(cascade = {CascadeType.MERGE }, fetch = FetchType.LAZY)
@JoinColumn(name = "agent_id")
public Agent getAgent() {
    return agent;
}

@OneToMany(mappedBy = "customer", fetch = FetchType.LAZY)
public List getDepartment() {
    return department;
}

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æ¸å 3. éè¿ Hibernate Annotations è¿è¡æ å°çç®åèç³»æ¹å¼
/**
 * A Simplified object that stores contact information.
 *
 * @author Ted Bergeron
 * @version $Id: Contact.java,v 1.1 2006/04/24 03:39:34 ted Exp $
 */
@MappedSuperclass
@Embeddable
public class Contact implements Serializable {
    public static final int MAX_FIRST_NAME = 30;
    public static final int MAX_MIDDLE_NAME = 1;
    public static final int MAX_LAST_NAME = 30;

    private String fname;
    private String mi;
    private String lname;
    private Date dateOfBirth;
    private String emailAddress;

    private Address address;

    public Contact() {
        this.address = new Address();
    }

    @Valid
    @Embedded
    public Address getAddress() {
        return address;
    }

    public void setAddress(Address a) {
        if (a == null) {
            address = new Address();
        } else {
            address = a;
        }
    }

    @NotNull
    @Length(min = 1, max = MAX_FIRST_NAME)
    @Column(name = "fname")
    public String getFirstname() {
        return fname;
    }

    public void setFirstname(String fname) {
        this.fname = fname;
    }

    @Length(min = 1, max = MAX_MIDDLE_NAME)
    @Column(name = "mi")
    public String getMi() {
        return mi;
    }

    public void setMi(String mi) {
        this.mi = mi;
    }

    @NotNull
    @Length(min = 1, max = MAX_LAST_NAME)
    @Column(name = "lname")
    public String getLastname() {
        return lname;
    }

    public void setLastname(String lname) {
        this.lname = lname;
    }

    @NotNull
    @Past
    @Column(name = "dob")
    public Date getDateOfBirth() {
        return dateOfBirth;
    }

    public void setDateOfBirth(Date dateOfBirth) {
        this.dateOfBirth = dateOfBirth;
    }

    @NotNull
    @Email
    @Column(name = "email")
    public String getEmailAddress() {
        return emailAddress;
    }

    public void setEmailAddress(String emailAddress) {
        this.emailAddress = emailAddress;
    }

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è¦æ§è¡éªè¯ï¼éè¦å建ä¸ä¸ª Hibernate ç ClassValidator å®ä¾ãè¿ä¸ªç±»è¿è¡å®ä¾åç代价å¯è½ä¼å¾é«ï¼å æ­¤æ好åªå¯¹å¸æè¿è¡éªè¯çæ¯ä¸ªç±»æ¥è¿è¡å®ä¾åãä¸ç§æ¹æ³æ¯å建ä¸ä¸ªå®ç¨å·¥å·ç±»ï¼å¯¹æ¯ä¸ªæ¨¡å对象å­å¨ä¸ä¸ª ClassValidator å®ä¾ï¼å¦æ¸å 4 æ示ï¼


æ¸å 4. å¤çéªè¯çå®ç¨å·¥å·ç±»
/**
 * Handles validations based on the Hibernate Annotations Validator framework.
 * @author Ted Bergeron
 * @version $Id: AnnotationValidator.java,v 1.5 2006/01/20 17:34:09 ted Exp $
 */
public class AnnotationValidator {
    private static Log log = LogFactory.getLog(AnnotationValidator.class);

    // It is considered a good practice to execute these lines once and 
    // cache the validator instances.
    public static final ClassValidator CUSTOMER_VALIDATOR =
       new ClassValidator(Customer.class);
    public static final ClassValidator CREDIT_CARD_VALIDATOR =
       new ClassValidator(CreditCard.class);

    private static ClassValidator getValidator(Class clazz) {
        if (Customer.class.equals(clazz)) {
            return CUSTOMER_VALIDATOR;
        } else if (CreditCard.class.equals(clazz)) {
            return CREDIT_CARD_VALIDATOR;
        } else {
            throw new IllegalArgumentException("Unsupported class was passed.");
        }
    }

    public static InvalidValue[] getInvalidValues(BaseObject modelObject) {
        String nullProperty = null;
        return getInvalidValues(modelObject, nullProperty);
    }

    public static InvalidValue[] getInvalidValues(BaseObject modelObject,
       String property) {
        Classclazz = modelObject.getClass();
        ClassValidator validator = getValidator(clazz);

        InvalidValue[] validationMessages;

        if (property == null) {
            validationMessages = validator.getInvalidValues(modelObject);
        } else {
            // only get invalid values for specified property.  
            // For example, "city" applies to getCity() method.
            validationMessages = validator.getInvalidValues(modelObject, property);
        }
        return validationMessages;
    }
}

å¨æ¸å 4 中ï¼å建äºä¸¤ä¸ª ClassValidatorï¼ä¸ä¸ªç¨äº Customerï¼å¦å¤ä¸ä¸ªç¨äº CreditCardãè¿ä¸¤ä¸ªå¸æè¿è¡éªè¯çç±»å¯ä»¥è°ç¨ getInvalidValues(BaseObject modelObject)ï¼ä¼è¿å InvalidValue[]ãè¿åä¼è¿åä¸ä¸ªåå«æ¨¡å对象å®ä¾é误çæ°ç»ãå¦å¤ï¼è¿ä¸ªæ¹æ³ä¹å¯ä»¥éè¿æä¾ä¸ä¸ªç¹å®çå±æ§åæ¥è°ç¨ï¼è¿æ ·åä¼åªè¿åä¸è¯¥åæå³çé误ã

å¨ä½¿ç¨ Spring MVC å Hibernate Validator æ¶ï¼ä¸ºä¿¡ç¨å¡å建ä¸ä¸ªéªè¯è¿ç¨åå¾é常ç®åï¼å¦æ¸å 5 æ示ï¼


æ¸å 5. Spring MVC æ§å¶å¨ä½¿ç¨ç CreditCardValidator
/**
 * Performs validation of a CreditCard in Spring MVC.
 *
 * @author Ted Bergeron
 * @version $Id: CreditCardValidator.java,v 1.2 2006/02/10 21:53:50 ted Exp $
 */
public class CreditCardValidator implements Validator {

    private CreditCardService creditCardService;

    public void setCreditCardService(CreditCardService service) {
        this.creditCardService = service;
    }

    public boolean supports(Class clazz) {
        return CreditCard.class.isAssignableFrom(clazz);
    }

    public void validate(Object object, Errors errors) {
        CreditCard creditCard = (CreditCard) object;

        InvalidValue[] invalids = AnnotationValidator.getInvalidValues(creditCard);
        
        // Perform "expensive" validation only if no simple errors found above.
        if (invalids == null || invalids.length == 0) { 
            boolean validCard = creditCardService.validateCreditCard(creditCard);
            if (!validCard) {
                errors.reject("error.creditcard.invalid");
            }
        } else {
            for (InvalidValue invalidValue : invalids) {
                errors.rejectValue(invalidValue.getPropertyPath(), 
                  null, invalidValue.getMessage());
            }
        }
    }
}

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æ¸å 7. Utilities èé
public static Boolean required(Object object, String propertyPath) {
    Method getMethod = findGetterMethod(object, propertyPath);
    if (getMethod == null) {
        return null;
    } else {
        return getMethod.isAnnotationPresent(NotNull.class);
    }
}

public static Boolean isDate(Object object, String propertyPath) {
    return java.util.Date.class.equals(getReturnType(object, propertyPath));
}

public static Class getReturnType(Object object, String propertyPath) {
    Method getMethod = findGetterMethod(object, propertyPath);
    if (getMethod == null) {
        return null;
    } else {
        return getMethod.getReturnType();
    }
}

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    content: '*';
}
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}

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