Jaxb2实现Bean与xml互转的示例代码详解

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

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