/**
* @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<Department> getDepartment() {
return department;
}

@NotNull
@Column(name = "name")
@Length(min = 1， max = NAME_LENGTH) //NAME_LENGTH是一个在另外地方声明的常数
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<Department> getDepartment() {
return department;
}

/**
*一个简化的存储联系人信息的对象
*/
@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;
}

/**
*基于Hibernate Annotations Validator框架进行校验
*/
public class AnnotationValidator {
private static Log log = LogFactory.getLog(AnnotationValidator.class);
//执行下面几行并对校验器实例进行缓冲是一种良好的编码习惯
public static final ClassValidator<Customer> CUSTOMER_VALIDATOR =
new ClassValidator<Customer>(Customer.class);
public static final ClassValidator<CreditCard> CREDIT_CARD_VALIDATOR =
new ClassValidator<CreditCard>(CreditCard.class);
private static ClassValidator<? extends BaseObject> getValidator(Class<? 
extends BaseObject> 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) {
Class<? extends BaseObject>clazz = modelObject.getClass();
ClassValidator validator = getValidator(clazz);
InvalidValue[] validationMessages;
if (property == null) {
validationMessages = validator.getInvalidValues(modelObject);
} else {
//仅取得指定属性的无效值。
//例如，“city”应用于getCity()方法
validationMessages = validator.getInvalidValues(modelObject， property);
}
return validationMessages;
}
}

/**
*在Spring MVC实现信用卡校验
*/
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);
//仅在上面没有出现简单错误时才进行“昂贵”的校验
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());
}
}
}
}

<?xml version="1.0" encoding="ISO-8859-1" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>form</short-name>
<uri>formtags</uri>
<tag-file>
<name>text</name>
<path>/WEB-INF/tags/form/text.tag</path>
</tag-file>
<function>
<description>determine if field is required from Annotations</description>
<name>required</name>
<function-class>com.triview.web.Utilities</function-class>
<function-signature>Boolean required(java.lang.Object，java.lang.String)
</function-signature>
</function>
</taglib>

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();
}
}

<%@ taglib tagdir="/WEB-INF/tags/form" prefix="form" %>
<form method="post" action="<c:url value="/signup/customer.edit"/>">
<form:select propertyPath="creditCard.type" collection="${creditCardTypeCollection}" 
required="true" labelKey="prompt.creditcard.type"/>
<form:text propertyPath="creditCard.number" labelKey="prompt.creditcard.number">
<img src="<c:url value="/images/icons/help.png"/>" alt="Help" 
 Effect.SlideDown('creditCardHelp')"/>
</form:text>
<form:text propertyPath="creditCard.expirationDate"/>
</form>

<%@attribute name="propertyPath" required="true" %>
<%@ attribute name="size" required="false" type="java.lang.Integer" %>
<%@ attribute name="maxlength" required="false" type="java.lang.Integer" %>
<%@ attribute name="required" required="false" type="java.lang.Boolean" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="formtags" prefix="form" %>
<c:set var="objectPath" value="${form:getObjectPath(propertyPath)}"/>
<spring:bind path="${objectPath}">
<c:set var="object" value="${status.value}"/>
<c:if test="${object == null}">
<%-- Bind ignores the command object prefix， so simple properties of the command object
return null above. --%>
<c:set var="object" value="${commandObject}"/> 
<%-- We depend on the controller adding this to request. --%>
</c:if>
</spring:bind>
<%-- If user did not specify whether this field is required， 
query the object for this info. --%>
<c:if test="${required == null}">
<c:set var="required" value="${form:required(object，propertyPath)}"/>
</c:if>
<c:choose>
<c:when test="${required == null || required == false}">
<c:set var="labelClass" value="optional"/>
</c:when>
<c:otherwise>
<c:set var="labelClass" value="required"/>
</c:otherwise>
</c:choose>
<c:if test="${maxlength == null}">
<c:set var="maxlength" value="${form:maxLength(object，propertyPath)}"/>
</c:if>
<c:set var="isDate" value="${form:isDate(object，propertyPath)}"/>
<c:set var="cssClass" value="input_text"/>
<c:if test="${isDate}">
<c:set var="cssClass" value="input_date"/>
</c:if>
<div class="field">
<spring:bind path="${propertyPath}">
<label for="${status.expression}" class="${labelClass}"><fmt:message 
key="prompt.${propertyPath}"/></label>
<input type="text" name="${status.expression}" value="${status.value}" 
id="${status.expression}"<c:if test="${size != null}"> size="${size}"</c:if>
<c:if test="${maxlength != null}"> maxlength="${maxlength}"</c:if>
class="${cssClass}"/>
<c:if test="${isDate}">
<img id="${status.expression}_button" 
src="<c:url value="/images/icons/calendar.png"/>" alt="calendar" 
style="cursor: pointer;"/>
<script type="text/javascript">
Calendar.setup( 
{
inputField : "${status.expression}"， //输入域的ID
ifFormat : "%m/%d/%Y"， //日期格式
button : "${status.expression}_button" //按钮的ID
}
);
</script>
</c:if>
<span class="icons"><jsp:doBody/></span> 
<c:if test="${status.errorMessage != null && status.errorMessage != ''}">
<p class="fieldError"><img id="${status.expression}_error" 
src="<c:url value="/images/icons/error.png"/>" 
alt="error"/>${status.errorMessage}</p>
</c:if>
</spring:bind>
</div>

label.required {
color: black;
background-image: url( /images/icons/flag_red.png );
background-position: left;
background-repeat: no-repeat;
}
label.required:after {
content: '*';
}
label.optional {
color: black;
}

<script type="text/javascript">
function checkRequired(form) {
var requiredLabels = document.getElementsByClassName("required"， form);
for (i = 0; i < requiredLabels.length; i++) {
var labelText = requiredLabels[i].firstChild.nodeValue; //取得标签的文本
var labelFor = requiredLabels[i].getAttribute("for"); //取得“for”属性
var inputTag = document.getElementById(labelFor); //得到输入标签
if (inputTag.value == null || inputTag.value == "") {
alert("Please make sure all required fields have been entered.");
return false;//取消提交
}
}
return true;
}
</script>

 Effect.SlideDown('creditCardHelp')"