WebService CXF JAXB角色及简单使用
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JAXB中常用的注解
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?二、简单示例
??? 1、@XmlRootElement
??????? POJO:
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package org.wy.pojo;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElementpublic class User {private String name = "wy";private String sex = "man"; public int age = 20; public String getName() {return name;}public void setName(String name) {this.name = name;}}?
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JaxbTest.java
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package org.wy.jaxb;import java.io.StringReader;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;import javax.xml.bind.Unmarshaller;import org.wy.pojo.User;public class JaxbTest {public static void main(String[] args) throws JAXBException {JAXBContext context = JAXBContext.newInstance(User.class);//JavaObject ---> XMLMarshaller marshaller = context.createMarshaller(); User user = new User();marshaller.marshal(user, System.out);System.out.println();// XML---> JavaObjectUnmarshaller unmarshaller = context.createUnmarshaller();String str = "<user><age>23</age></user>";user = (User)unmarshaller.unmarshal(new StringReader(str));System.out.println(user.age);}}?
输出结果：
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><age>20</age><name>wy</name></user>23
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从输出结果看到 性别没有转换到xml中，原因可以从后接口XmlAccessorType.java中找到原因
我们可以看到如下
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@Inherited @Retention(RUNTIME) @Target({PACKAGE, TYPE})public @interface XmlAccessorType { /** * Specifies whether fields or properties are serialized. * * @see XmlAccessType */ XmlAccessType value() default XmlAccessType.PUBLIC_MEMBER;}?默认处理方式PUBLIC_MEMBER，处理public的。但是name是private的也转换成功了，原因是name被设置成了属性。
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XmlAccessorType 有几种处理方式哪？
? 查看枚举类XmlAccessType.java
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public enum XmlAccessType { /** * Every getter/setter pair in a JAXB-bound class will be automatically * bound to XML, unless annotated by {@link XmlTransient}. * * Fields are bound to XML only when they are explicitly annotated * by some of the JAXB annotations. */ PROPERTY, /** * Every non static, non transient field in a JAXB-bound class will be automatically * bound to XML, unless annotated by {@link XmlTransient}. * * Getter/setter pairs are bound to XML only when they are explicitly annotated * by some of the JAXB annotations. */ FIELD, /** * Every public getter/setter pair and every public field will be * automatically bound to XML, unless annotated by {@link XmlTransient}. * * Fields or getter/setter pairs that are private, protected, or * defaulted to package-only access are bound to XML only when they are * explicitly annotated by the appropriate JAXB annotations. */ PUBLIC_MEMBER, /** * None of the fields or properties is bound to XML unless they * are specifically annotated with some of the JAXB annotations. */ NONE}?
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当然JAXB也支持修改XML文档的根节点名称和命名空间，修改方式如下
@XmlRootElement(name="userwy", namespace="user-wy")
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2、@XmlAccessorType
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??? POJO：
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package org.wy.pojo;import javax.xml.bind.annotation.XmlAccessType;import javax.xml.bind.annotation.XmlAccessorType;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement@XmlAccessorType(XmlAccessType.PROPERTY)public class User {private String name = "wy";private String sex = "man"; public int age = 20; public String getName() {return name;}public void setName(String name) {this.name = name;}}?
输出结果：
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><name>wy</name></user>20
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将@XmlAccessorType(XmlAccessType.FIELD)
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输出结果：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><name>wy</name><sex>man</sex><age>20</age></user>23
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?3、@XmlJavaTypeAdapter
?? 复杂对象
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package org.wy.pojo;import javax.xml.bind.annotation.XmlAccessType;import javax.xml.bind.annotation.XmlAccessorType;import javax.xml.bind.annotation.XmlRootElement;import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;@XmlRootElement@XmlAccessorType(XmlAccessType.PROPERTY)public class User {private String name = "wy";private String sex = "man"; public int age = 20; private Address address; public String getName() {return name;}public void setName(String name) {this.name = name;}@XmlJavaTypeAdapter(AddressAdapter.class)public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}}?
Address.java接口
package org.wy.pojo;public interface Address { public String getAddress();}?
AddressImpl.java
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package org.wy.pojo;public class AddressImpl implements Address{ private String address;public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}}?
AddressAdapter.java
package org.wy.pojo;import javax.xml.bind.annotation.adapters.XmlAdapter;public class AddressAdapter extends XmlAdapter<String, Address> {@Overridepublic Address unmarshal(String v) throws Exception {AddressImpl address = new AddressImpl();address.setAddress(v);return address;}@Overridepublic String marshal(Address v) throws Exception {return v.getAddress();}}?
JaxbTest.java
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package org.wy.jaxb;import java.io.StringReader;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;import javax.xml.bind.Unmarshaller;import org.wy.pojo.AddressImpl;import org.wy.pojo.User;public class JaxbTest {public static void main(String[] args) throws JAXBException {JAXBContext context = JAXBContext.newInstance(User.class);//JavaObject ---> XMLMarshaller marshaller = context.createMarshaller(); User user = new User();AddressImpl address = new AddressImpl();address.setAddress("BeiJing");user.setAddress(address);marshaller.marshal(user, System.out);System.out.println();// XML---> JavaObjectUnmarshaller unmarshaller = context.createUnmarshaller();String str = "<user><age>23</age></user>";user = (User)unmarshaller.unmarshal(new StringReader(str));System.out.println(user.age);}}?
输出结果：
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><address>BeiJing</address><name>wy</name></user>20
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