jaxb 组装及解析xml

2022-12-22 10:53:00

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());

	}

}

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