一、重要类说明
JAXBContext类，是应用的入口，用于管理XML/Java绑定信息。
Marshaller接口，将Java对转化为XML数据。
Unmarshaller接口，将XML转化为Java对象。
@XmlType，将Java类或枚举类型映射到XML模式类型
@XmlAccessorType(XmlAccessType.FIELD) ，控制字段或属性的序列化。FIELD表示JAXB将自动绑定Java类中的每个非静态的（static）、
非瞬态的（由@XmlTransient标 注）字段到XML。其他值还有XmlAccessType.PROPERTY和XmlAccessType.NONE。
@XmlAccessorOrder，控制JAXB 绑定类中属性和字段的排序。
@XmlJavaTypeAdapter，使用定制的适配器（即扩展抽象类XmlAdapter并覆盖marshal()和unmarshal()方法），以序列化Java类为XML。
@XmlElementWrapper ，对于数组或集合（即包含多个元素的成员变量），生成一个包装该数组或集合的XML元素（称为包装器）。
@XmlRootElement，将Java类或枚举类型映射到XML元素。
@XmlElement，将Java类的一个属性映射到与属性同名的一个XML元素。
@XmlAttribute，将Java类的一个属性映射到与属性同名的一个XML属性。
二、实例
1、JavaBean
import java.util.Date;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import com.tzz.util.xml.JaxbDateSerializer;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "country")
@XmlType(propOrder = { "id", "createDate", "name", "provinceList" })
public class Country {
private Integer id;
@XmlJavaTypeAdapter(JaxbDateSerializer.class)
private Date createDate;
@XmlElement(name = "name")
private String name;
@XmlElementWrapper(name = "provinces")
@XmlElement(name = "province")
private List<Province> provinceList;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Province> getProvinceList() {
return provinceList;
}
public void setProvinceList(List<Province> provinceList) {
this.provinceList = provinceList;
}
}import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = { "name", "provCity" })
public class Province {
@XmlElement(name = "name")
private String name;
@XmlElement(name = "provCity")
private String provCity;
public String getProvCity() {
return provCity;
}
public void setProvCity(String provCity) {
this.provCity = provCity;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}2、转化工具类
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
/**
* Jaxb 2.0
*
*/
public class JaxbXmlUtil {
@SuppressWarnings("unchecked")
public static <T> T xmlToBean(String xml, Class<T> beanClass) {
try {
JAXBContext jaxbContext = JAXBContext.newInstance(beanClass);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
T user = (T) unmarshaller.unmarshal(new StringReader(xml));
return user;
} catch (JAXBException e) {
e.printStackTrace();
return null;
}
}
/**Bean转XML*/
public static String beanToXml(Object obj) {
String result = null;
try {
JAXBContext context = JAXBContext.newInstance(obj.getClass());
Marshaller marshaller = context.createMarshaller();
//决定是否在转换成xml时同时进行格式化（即按标签自动换行，否则即是一行的xml）
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
//Marshaller.JAXB_ENCODING xml的编码方式
marshaller.setProperty(Marshaller.JAXB_ENCODING, "utf-8");
StringWriter writer = new StringWriter();
marshaller.marshal(obj, writer);
result = writer.toString();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}3、测试类
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.junit.Test;
import com.tzz.test.util.xml.entity.Country;
import com.tzz.test.util.xml.entity.Province;
import com.tzz.util.xml.JaxbXmlUtil;
public class TestJaxbBeanToXmlUtil {
@Test
public void testBeanToXml() {
Country country = new Country();
country.setId(1);
country.setCreateDate(new Date());
country.setName("中国");
List<Province> list = new ArrayList<Province>();
Province province = new Province();
province.setName("广东省");
province.setProvCity("广州市");
Province province2 = new Province();
province2.setName("湖南省");
province2.setProvCity("长沙市");
list.add(province);
list.add(province2);
country.setProvinceList(list);
String xml = JaxbXmlUtil.beanToXml(country);
System.out.println(xml);
}
@Test
public void testXmlToBean() {
String xml = "<?xml version='1.0' encoding='utf-8' ?>"
+ "<country>"
+ "<id>1</id>"
+ "<createDate>2016-03-10 09:36:01</createDate>"
+ "<name>中国</name>"
+ "<provinces>"
+ "<province><name>广东省</name><provCity>广州市</provCity></province>"
+ "<province><name>湖南省</name><provCity>长沙市</provCity></province>"
+ "</provinces>"
+ "</country>";
Country country = JaxbXmlUtil.xmlToBean(xml, Country.class);
System.out.println(country.getId() + "--" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
.format(country.getCreateDate()) + "--" + country.getName());
for (Province p : country.getProvinceList()) {
System.out.println(p.getName() + "---" + p.getProvCity());
}
}
}4、测试结果
4.1、运行testBeanToXml方法
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<country>
<id>1</id>
<createDate>2016-03-10 05:24:57</createDate>
<name>中国</name>
<provinces>
<province>
<name>广东省</name>
<provCity>广州市</provCity>
</province>
<province>
<name>湖南省</name>
<provCity>长沙市</provCity>
</province>
</provinces>
</country>4.2、运行testXmlToBean方法
1--2016-03-10 09:36:01--中国 广东省---广州市 湖南省---长沙市
