这篇文章着眼于使用Orika将JAXB对象映射到业务域对象。 本月初， 我使用基于反射的Dozer讨论 了相同的映射用例 。 在本文中，我假设需要映射相同的示例类，但是它们将使用Orika而不是Dozer进行映射 。

Dozer和Orika旨在解决相同类型的问题：两个“数据”对象的自动映射，这些对象不共享公共继承，但表示相同的数据字段。 推土机使用反射来完成此操作，而Orika使用反射和字节码操作来完成此操作。 Orika的口号是“更简单，更轻便，更快的Java bean映射”。

Orika拥有版本2的Apache许可证，可以从https://github.com/orika-mapper/orika/archive/master.zip （源）或http://search.maven.org/#search下载。 | ga | 1 | orika （二进制）。 Orika对Javassist （用于字节码操作）， SLF4J和paranamer （用于在运行时访问方法/构造函数参数名称）具有依赖性 。 这三个依赖项中的两个（JavaAssist和paranamer而不是SLF4J）捆绑在orika-core-1.4.4-deps-included.jar 。 如果依赖项已经可用，则可以使用更薄的orika-core-1.4.4.jar 。 就像这些JAR的名称所暗示的那样，在本文中，我使用Orika 1.4.4作为示例。

在我的《 推土机：将JAXB对象映射到业务/域对象》一文中 ，我讨论了通常不希望将JAXB生成的类的实例用作业务或域对象的原因。 然后，我展示了JAXB生成的类和自定义数据类之间的“传统”映射方式，以便可以在业务域数据对象中的整个应用程序中传递数据。 在本文中，我将使用相同的方法，但是使用Orika进行映射，而不是进行自定义映射或使用Dozer进行映射。 为了方便起见，我在此处列出了JAXB生成的类com.blogspot.marxsoftware.AddressType和com.blogspot.marxsoftware.PersonType的成本清单，以及重命名的自定义数据类dustin.examples.orikademo.Address和dustin.examples.orikademo.Person 。

JAXB生成的AddressType.java

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4-2
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a>
// Any modifications to this file will be lost upon recompilation of the source schema.
// Generated on: 2013.12.03 at 11:44:32 PM MST
//package com.blogspot.marxsoftware;import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;/*** <p>Java class for AddressType complex type.* * <p>The following schema fragment specifies the expected content contained within this class.* * <pre>* <complexType name="AddressType">*   <complexContent>*     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">*       <attribute name="streetAddress1" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />*       <attribute name="streetAddress2" type="{http://www.w3.org/2001/XMLSchema}string" />*       <attribute name="city" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />*       <attribute name="state" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />*       <attribute name="zipcode" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />*     </restriction>*   </complexContent>* </complexType>* </pre>* * */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "AddressType")
public class AddressType {@XmlAttribute(name = "streetAddress1", required = true)protected String streetAddress1;@XmlAttribute(name = "streetAddress2")protected String streetAddress2;@XmlAttribute(name = "city", required = true)protected String city;@XmlAttribute(name = "state", required = true)protected String state;@XmlAttribute(name = "zipcode", required = true)protected String zipcode;/*** Gets the value of the streetAddress1 property.* * @return*     possible object is*     {@link String }*     */public String getStreetAddress1() {return streetAddress1;}/*** Sets the value of the streetAddress1 property.* * @param value*     allowed object is*     {@link String }*     */public void setStreetAddress1(String value) {this.streetAddress1 = value;}/*** Gets the value of the streetAddress2 property.* * @return*     possible object is*     {@link String }*     */public String getStreetAddress2() {return streetAddress2;}/*** Sets the value of the streetAddress2 property.* * @param value*     allowed object is*     {@link String }*     */public void setStreetAddress2(String value) {this.streetAddress2 = value;}/*** Gets the value of the city property.* * @return*     possible object is*     {@link String }*     */public String getCity() {return city;}/*** Sets the value of the city property.* * @param value*     allowed object is*     {@link String }*     */public void setCity(String value) {this.city = value;}/*** Gets the value of the state property.* * @return*     possible object is*     {@link String }*     */public String getState() {return state;}/*** Sets the value of the state property.* * @param value*     allowed object is*     {@link String }*     */public void setState(String value) {this.state = value;}/*** Gets the value of the zipcode property.* * @return*     possible object is*     {@link String }*     */public String getZipcode() {return zipcode;}/*** Sets the value of the zipcode property.* * @param value*     allowed object is*     {@link String }*     */public void setZipcode(String value) {this.zipcode = value;}}

JAXB生成的PersonType.java

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4-2
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a>
// Any modifications to this file will be lost upon recompilation of the source schema.
// Generated on: 2013.12.03 at 11:44:32 PM MST
//package com.blogspot.marxsoftware;import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;/*** <p>Java class for PersonType complex type.* * <p>The following schema fragment specifies the expected content contained within this class.* * <pre>* <complexType name="PersonType">*   <complexContent>*     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">*       <sequence>*         <element name="MailingAddress" type="{http://marxsoftware.blogspot.com/}AddressType"/>*         <element name="ResidentialAddress" type="{http://marxsoftware.blogspot.com/}AddressType" minOccurs="0"/>*       </sequence>*       <attribute name="firstName" type="{http://www.w3.org/2001/XMLSchema}string" />*       <attribute name="lastName" type="{http://www.w3.org/2001/XMLSchema}string" />*     </restriction>*   </complexContent>* </complexType>* </pre>* * */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "PersonType", propOrder = {"mailingAddress","residentialAddress"
})
public class PersonType {@XmlElement(name = "MailingAddress", required = true)protected AddressType mailingAddress;@XmlElement(name = "ResidentialAddress")protected AddressType residentialAddress;@XmlAttribute(name = "firstName")protected String firstName;@XmlAttribute(name = "lastName")protected String lastName;/*** Gets the value of the mailingAddress property.* * @return*     possible object is*     {@link AddressType }*     */public AddressType getMailingAddress() {return mailingAddress;}/*** Sets the value of the mailingAddress property.* * @param value*     allowed object is*     {@link AddressType }*     */public void setMailingAddress(AddressType value) {this.mailingAddress = value;}/*** Gets the value of the residentialAddress property.* * @return*     possible object is*     {@link AddressType }*     */public AddressType getResidentialAddress() {return residentialAddress;}/*** Sets the value of the residentialAddress property.* * @param value*     allowed object is*     {@link AddressType }*     */public void setResidentialAddress(AddressType value) {this.residentialAddress = value;}/*** Gets the value of the firstName property.* * @return*     possible object is*     {@link String }*     */public String getFirstName() {return firstName;}/*** Sets the value of the firstName property.* * @param value*     allowed object is*     {@link String }*     */public void setFirstName(String value) {this.firstName = value;}/*** Gets the value of the lastName property.* * @return*     possible object is*     {@link String }*     */public String getLastName() {return lastName;}/*** Sets the value of the lastName property.* * @param value*     allowed object is*     {@link String }*     */public void setLastName(String value) {this.lastName = value;}}

域/业务类Address.java

package dustin.examples.orikademo;import java.util.Objects;/*** Address class.* * @author Dustin*/
public class Address
{private String streetAddress1;private String streetAddress2;private String municipality;private String state;private String zipCode;public Address() {}public Address(final String newStreetAddress1,final String newStreetAddress2,final String newMunicipality,final String newState,final String newZipCode){this.streetAddress1 = newStreetAddress1;this.streetAddress2 = newStreetAddress2;this.municipality = newMunicipality;this.state = newState;this.zipCode = newZipCode;}public String getStreetAddress1(){return this.streetAddress1;}public void setStreetAddress1(String streetAddress1){this.streetAddress1 = streetAddress1;}public String getStreetAddress2(){return this.streetAddress2;}public void setStreetAddress2(String streetAddress2){this.streetAddress2 = streetAddress2;}public String getMunicipality(){return this.municipality;}public void setMunicipality(String municipality){this.municipality = municipality;}public String getState() {return this.state;}public void setState(String state){this.state = state;}public String getZipCode() {return this.zipCode;}public void setZipCode(String zipCode){this.zipCode = zipCode;}@Overridepublic int hashCode(){return Objects.hash(this.streetAddress1, this.streetAddress2, this.municipality,this.state, this.zipCode);}@Overridepublic boolean equals(Object obj){if (obj == null) {return false;}if (getClass() != obj.getClass()) {return false;}final Address other = (Address) obj;if (!Objects.equals(this.streetAddress1, other.streetAddress1)){return false;}if (!Objects.equals(this.streetAddress2, other.streetAddress2)){return false;}if (!Objects.equals(this.municipality, other.municipality)){return false;}if (!Objects.equals(this.state, other.state)){return false;}if (!Objects.equals(this.zipCode, other.zipCode)){return false;}return true;}@Overridepublic String toString(){return "Address{" + "streetAddress1=" + streetAddress1 + ", streetAddress2="+ streetAddress2 + ", municipality=" + municipality + ", state=" + state+ ", zipCode=" + zipCode + '}';}}

域/业务类Person.java

package dustin.examples.orikademo;import java.util.Objects;/*** Person class.* * @author Dustin*/
public class Person
{private String lastName;private String firstName;private Address mailingAddress;private Address residentialAddress;public Person() {}public Person(final String newLastName,final String newFirstName,final Address newResidentialAddress,final Address newMailingAddress){this.lastName = newLastName;this.firstName = newFirstName;this.residentialAddress = newResidentialAddress;this.mailingAddress = newMailingAddress;}public String getLastName(){return this.lastName;}public void setLastName(String lastName) {this.lastName = lastName;}public String getFirstName(){return this.firstName;}public void setFirstName(String firstName){this.firstName = firstName;}public Address getMailingAddress(){return this.mailingAddress;}public void setMailingAddress(Address mailingAddress){this.mailingAddress = mailingAddress;}public Address getResidentialAddress(){return this.residentialAddress;}public void setResidentialAddress(Address residentialAddress){this.residentialAddress = residentialAddress;}@Overridepublic int hashCode(){int hash = 3;hash = 19 * hash + Objects.hashCode(this.lastName);hash = 19 * hash + Objects.hashCode(this.firstName);hash = 19 * hash + Objects.hashCode(this.mailingAddress);hash = 19 * hash + Objects.hashCode(this.residentialAddress);return hash;}@Overridepublic boolean equals(Object obj){if (obj == null){return false;}if (getClass() != obj.getClass()){return false;}final Person other = (Person) obj;if (!Objects.equals(this.lastName, other.lastName)){return false;}if (!Objects.equals(this.firstName, other.firstName)){return false;}if (!Objects.equals(this.mailingAddress, other.mailingAddress)){return false;}if (!Objects.equals(this.residentialAddress, other.residentialAddress)){return false;}return true;}@Overridepublic String toString() {return  "Person{" + "lastName=" + lastName + ", firstName=" + firstName+ ", mailingAddress=" + mailingAddress + ", residentialAddress="+ residentialAddress + '}';}}

与Dozer一样，要映射的类需要具有无参数的构造函数以及“ set”和“ get”方法以支持双向转换，而无需任何特殊的附加配置。 此外，与Dozer一样，Orika会自动映射同名字段，并易于配置异常的映射（名称不匹配的字段）。 下一个代码清单（针对我称为OrikaPersonConverter的类）演示了OrikaPersonConverter MapperFactory的实例化和配置，以默认情况下映射大多数字段，并通过显式映射来映射名称彼此不同的字段 （“市政”和“城市”）组态。 一旦配置了MapperFactory ，就可以轻松地从一个对象复制到另一个对象，并且两个方向都在copyPersonTypeFromPerson和copyPersonFromPersonType方法中进行了描述。

OrikaPersonConverter

package dustin.examples.orikademo;import com.blogspot.marxsoftware.AddressType;
import com.blogspot.marxsoftware.PersonType;
import ma.glasnost.orika.MapperFacade;
import ma.glasnost.orika.MapperFactory;
import ma.glasnost.orika.impl.DefaultMapperFactory;/*** Convert between instances of {@link com.blogspot.marxsoftware.PersonType}* and {@link dustin.examples.orikademo.Person}.* * @author Dustin*/
public class OrikaPersonConverter
{/** Orika Mapper Facade. */private final static MapperFacade mapper;static{final MapperFactory mapperFactory = new DefaultMapperFactory.Builder().build();mapperFactory.classMap(Address.class, AddressType.class).field("municipality", "city").byDefault().register();mapper = mapperFactory.getMapperFacade();}/** No-arguments constructor. */public OrikaPersonConverter() {}/*** Provide an instance of {@link com.blogspot.marxsoftware.PersonType}* that corresponds with provided {@link dustin.examples.orikademo.Person} as* mapped by Dozer Mapper.* * @param person Instance of {@link dustin.examples.orikademo.Person} from which*    {@link com.blogspot.marxsoftware.PersonType} will be extracted.* @return Instance of {@link com.blogspot.marxsoftware.PersonType} that*    is based on provided {@link dustin.examples.orikademo.Person} instance.*/public PersonType copyPersonTypeFromPerson(final Person person){PersonType personType = mapper.map(person, PersonType.class);return personType;}/*** Provide an instance of {@link dustin.examples.orikademo.Person} that corresponds* with the provided {@link com.blogspot.marxsoftware.PersonType} as * mapped by Dozer Mapper.* * @param personType Instance of {@link com.blogspot.marxsoftware.PersonType}*    from which {@link dustin.examples.orikademo.Person} will be extracted.* @return Instance of {@link dustin.examples.orikademo.Person} that is based on the*    provided {@link com.blogspot.marxsoftware.PersonType}.*/public Person copyPersonFromPersonType(final PersonType personType){Person person = mapper.map(personType, Person.class);return person;}
}

与Dozer的情况一样，两个类之间的映射是双向的，因此只需要进行一次映射，并将应用于从一个对象到另一个对象的复制。

结论

像推土机一样，Orika提供的可定制性和灵活性比本文中演示的要好得多。 但是，对于相对简单的映射（在使用JAXB生成的对象的应用程序中很常见），Orika非常易于使用。 《 Orika用户指南》是了解Orika的一个很好的资源。

翻译自: https://www.javacodegeeks.com/2013/12/orika-mapping-jaxb-objects-to-businessdomain-objects.html