jaxb 组装及解析xml

参考

http://blog.csdn.net/yanan_seachange/article/details/7325708

a.添加依赖

b.建立绑定关系

c.测试

a.添加依赖

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-core</artifactId>
    <version>2.2.</version>
</dependency>
<dependency>
    <groupId>javax.xml</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.1</version>
</dependency>
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.2.</version>
</dependency>
</dependency>

b.建立绑定关系

package com.yun.jaxb;

import java.util.Vector;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="earth")
public class Earth {
    private String description="earth";
    private Vector<Country> countries;
    @XmlAttribute
    public String getDescription() {
       return description;
    }
    public void setDescription(String description) {
       this.description = description;
    }
    @XmlElementWrapper(name="countrys")
    @XmlElement(name="country")
    public Vector<Country> getCountries() {
       return countries;
    }
    public void setCountries(Vector<Country> countries) {
       this.countries = countries;
    }
}

package com.yun.jaxb;

import java.util.Vector;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="country")
public class Country {
    private String description;
    private String name;
    private Vector<Province> provinces;
    @XmlElement
    public String getName() {
       return name;
    }
    public void setName(String name) {
       this.name = name;
    }
    @XmlElement
    public String getDescription() {
       return description;
    }
    public void setDescription(String description) {
       this.description = description;
    }
    @XmlElementWrapper(name="provinces")
    @XmlElement(name="province")//如果provice对象中没有集合或者数组类型的属性了，该注解可以省略。否则，它是必须的。
    public Vector<Province> getProvinces() {
       return provinces;
    }
    public void setProvinces(Vector<Province> provinces) {
       this.provinces = provinces;
    }
}

package com.yun.jaxb;

import java.util.Vector;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="province")
public class Province {
    private String name;
    private Vector<City> cities;
    @XmlElementWrapper(name="cities")
    @XmlElement(name="city")
    public Vector<City> getCities() {
       return cities;
    }
    public void setCities(Vector<City> cities) {
       this.cities = cities;
    }
    @XmlElement()
    public String getName() {
       return name;
    }
    public void setName(String name) {
       this.name = name;
    }
}

package com.yun.jaxb;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="city")
public class City {
    private String name;
    @XmlElement
    public String getName() {
       return name;
    }
    public void setName(String name) {
       this.name = name;
    }
}

c.测试

public static void vectorXml() {
        City zhengzhou=new City();
        City jinan=new City();
        zhengzhou.setName("郑州");
        jinan.setName("济南");

        Province henan=new Province();
        henan.setName("河南");
        Vector<City> henanCity=new Vector<City>();
        henanCity.add(zhengzhou);
        henan.setCities(henanCity);
        Province shandong=new Province();
        shandong.setName("山东");
        Vector<City> sdCity=new Vector<City>();
        sdCity.add(zhengzhou);
        henan.setCities(sdCity);

        Country country=new Country();
        country.setDescription("这里是天朝");
        country.setName("中国");
        Vector<Province> provinces=new Vector<Province>();
        provinces.add(henan);
        provinces.add(shandong);
        country.setProvinces(provinces);

        Earth earth=new Earth();
        earth.setDescription("地球...");
        Vector<Country> countrys=new Vector<Country>();
        countrys.add(country);
        earth.setCountries(countrys);

        FileOutputStream outPut=null;
        try {
            outPut=new FileOutputStream("earth.xml");
            JAXBContext jc=JAXBContext.newInstance(Earth.class);
            Marshaller m=jc.createMarshaller();
            m.marshal(earth, outPut);
        } catch(Exception e){
            e.printStackTrace();
        }
        finally {
            try {
                outPut.close();
            } catch (IOException e) {

            }
        }
    }

结果：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<earth description="地球...">
    <countrys>
        <country>
            <description>这里是天朝</description>
            <name>中国</name>
            <provinces>
                <province>
                    <cities>
                        <city>
                            <name>郑州</name>
                        </city>
                    </cities>
                    <name>河南</name>
                </province>
                <province>
                    <name>山东</name>
                </province>
            </provinces>
        </country>
    </countrys>
</earth>

解析：

 public static void unmarshalVectorXml() {
        try {
            File file = new File("earth.xml");
            JAXBContext jaxbContext = JAXBContext.newInstance(Earth.class);

            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
            Earth earth = (Earth) jaxbUnmarshaller.unmarshal(file);
            System.out.println(earth);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

封装util

package com.yun.xml.util;

import java.io.ByteArrayOutputStream;
import java.io.StringReader;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;

public class JaxbUtil {

	private static final String ENCODING_UTF8 = "UTF8";

	/**
     * JavaBean转换成xml
     *
     * @param obj
     * @param encoding
     * @return
     */
    public static String convertToXml(Object obj) {

        try {
            JAXBContext context = JAXBContext.newInstance(obj.getClass());
            Marshaller marshaller = context.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_ENCODING, JaxbUtil.ENCODING_UTF8);
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            //注意jdk版本
            XMLOutputFactory xmlOutputFactory = XMLOutputFactory.newInstance();
            XMLStreamWriter xmlStreamWriter = xmlOutputFactory
                    .createXMLStreamWriter(baos, (String) marshaller
                            .getProperty(Marshaller.JAXB_ENCODING));
            xmlStreamWriter.writeStartDocument(
                    (String) marshaller.getProperty(Marshaller.JAXB_ENCODING),
                    "1.0");
            marshaller.marshal(obj, xmlStreamWriter);
            xmlStreamWriter.writeEndDocument();
            xmlStreamWriter.close();
            return new String(baos.toString(JaxbUtil.ENCODING_UTF8));

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;

    }

    /**
     * xml转换成JavaBean
     *
     * @param xml
     * @param c
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T> T converyToJavaBean(String xml, Class<T> c) {
        T t = null;
        try {
            JAXBContext context = JAXBContext.newInstance(c);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            t = (T) unmarshaller.unmarshal(new StringReader(xml));
        } catch (Exception e) {
            e.printStackTrace();
        }

        return t;
    }

}

　测试

package com.yun.xml.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Vector;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import com.yun.xml.bo.City;
import com.yun.xml.bo.Country;
import com.yun.xml.bo.Earth;
import com.yun.xml.bo.Province;
import com.yun.xml.util.JaxbUtil;

public class XmlTest {

	public static void unmarshalVectorXml() {
        try {
            File file = new File("earth.xml");
            JAXBContext jaxbContext = JAXBContext.newInstance(Earth.class);

            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
            Earth earth = (Earth) jaxbUnmarshaller.unmarshal(file);
            System.out.println(earth);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

	public static void marshalVectorXml() {
		Earth earth = installBean();
	    FileOutputStream outPut=null;
	    try {
	        outPut=new FileOutputStream("earth.xml");
	        JAXBContext jc=JAXBContext.newInstance(Earth.class);
	        Marshaller m=jc.createMarshaller();
	        m.marshal(earth, outPut);
	    } catch(Exception e){
	        e.printStackTrace();
	    }
	    finally {
	        try {
	            outPut.close();
	        } catch (IOException e) {

	        }
	    }
	}

	private static Earth installBean() {
		City zhengzhou=new City();
	    City jinan=new City();
	    zhengzhou.setName("郑州");
	    jinan.setName("济南");

	    Province henan=new Province();
	    henan.setName("河南");
	    Vector<City> henanCity=new Vector<City>();
	    henanCity.add(zhengzhou);
	    henan.setCities(henanCity);
	    Province shandong=new Province();
	    shandong.setName("山东");
	    Vector<City> sdCity=new Vector<City>();
	    sdCity.add(zhengzhou);
	    henan.setCities(sdCity);

	    Country country=new Country();
	    country.setDescription("这里是天朝");
	    country.setName("中国");
	    Vector<Province> provinces=new Vector<Province>();
	    provinces.add(henan);
	    provinces.add(shandong);
	    country.setProvinces(provinces);

	    Earth earth=new Earth();
	    earth.setDescription("地球...");
	    Vector<Country> countrys=new Vector<Country>();
	    countrys.add(country);
	    earth.setCountries(countrys);
		return earth;
	}

	public static String toXml() {
		Earth earth = installBean();
		return JaxbUtil.convertToXml(earth);
	}

	public static Earth toBean() {
		String xml = "<?xml version=\"1.0\" encoding=\"UTF8\"?><earth description=\"地球...\"><countrys><country><description>这里是天朝</description><name>中国</name><provinces><province><cities><city><name>郑州</name></city></cities><name>河南</name></province><province><name>山东</name></province></provinces></country></countrys></earth>";
		return JaxbUtil.converyToJavaBean(xml, Earth.class);
	}

	public static void main(String[] args) {
//		marshalVectorXml();
//		unmarshalVectorXml();
		System.out.println(toXml());
		Earth earth = toBean();
		System.out.println(earth.getDescription());
	}

}