import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.XppDomDriver;
import com.thoughtworks.xstream.io.xml.XppDriver;
import org.junit.Test;
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.*;

public class XMLEncoderAndXMLDecoder {
    @Test
    public void xmlEncoder(){

        try {
            /**
             * 把对象转成XML文件存储
             */
            //定义输出流对象
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("test.xml"));
            XMLEncoder xmle = new XMLEncoder(out);
            Person p = new Person();
            p.setPersonid("1212");
            p.setName("Jerry");
            p.setAddress("shenzhen");
            p.setTel("123456");
            p.setFax("987654");
            p.setEmail("com.vince");
            xmle.writeObject(p);
            xmle.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    }

    @Test
    public void xmlDecoder(){
        try {
            /**
             * 把XML文件解析成对象
             */
            BufferedInputStream in = new BufferedInputStream(new FileInputStream("test.xml"));
            XMLDecoder xmld = new XMLDecoder(in);
            Person person = (Person)xmld.readObject();
            System.out.println(person);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * xstream解析和生成XML文件{需要下载jar包：xstream-1.2.2.jar 和 xpp3-1.1.4-min.jar}
     */
    @Test
    public void xstreamTOxml(){
        Person p = new Person();
        p.setPersonid("1212");
        p.setName("Jerry");
        p.setAddress("shenzhen");
        p.setTel("123456");
        p.setFax("987654");
        p.setEmail("com.vince");
        XStream xs = new XStream(new XppDriver()); //或者：XStream xs = new XStream(new XppDomDriver());
        //为Person这个类名设置别名：person在XML文件中即这个：<person>
        //如果不设置别名，生成的xml是带包名的：<com.vince.XMLAndJSONDemo.Person>
        xs.alias("person", Person.class);
        //为Person类名设置属性值："personid"
        xs.useAttributeFor(Person.class,"personid");
        String xml = xs.toXML(p);
        System.out.println(xml);

        /**
         * xstream解析xml文件生成对象
         */
        Person person = (Person)xs.fromXML(xml);
        System.out.println(person);       
    }
}

Person.java

package com.vince.XMLAndJSONDemo;

public class Person {
    private String personid;
    private String name;
    private String address;
    private String tel;
    private String fax;
    private String email;

    public Person() {
    }

    public Person(String personid, String name, String address, String tel, String fax, String email) {
        this.personid = personid;
        this.name = name;
        this.address = address;
        this.tel = tel;
        this.fax = fax;
        this.email = email;
    }

    public String getPersonid() {
        return personid;
    }

    public void setPersonid(String personid) {
        this.personid = personid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getTel() {
        return tel;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public String getFax() {
        return fax;
    }

    public void setFax(String fax) {
        this.fax = fax;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Person{" +
                "personid='" + personid + '\'' +
                ", name='" + name + '\'' +
                ", address='" + address + '\'' +
                ", tel='" + tel + '\'' +
                ", fax='" + fax + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

XStream 详细解析XML和写入XML(供其它类方法调用此方法的)

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.XppDriver;
import com.vince.bean.Clothes;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

//解析XML的工具类 {这里用到XStream ，XPP3 工具包}
public class ProductsXmlUtils {
    //解析XML文件生成对象集合List<Clothes>
    public static List<Clothes> parseProductsFromXml(){
        List<Clothes> products = new ArrayList<>();
        try {
            BufferedInputStream in = new BufferedInputStream(new FileInputStream("products.xml"));
            XStream xStream = new XStream(new XppDriver());

            //为xml文件里的根节点标签名即<list> 设置一个别名"list"，如果不设置，生成的xml文件中，根节点会带上包名<.包名.list>
            //所以这里products就可以看作是这个List<Clothes>集合的一个对象：要得到类的class就可以使用：对象.getClass()
            xStream.alias("list", products.getClass());
            //为xml的根节点的子节点clothes设置别名“clothes”
            xStream.alias("clothes", Clothes.class);
            //为某个类设置属性：所要执行类的Class{Clothes.class},然后取这个类里的哪个属性值{id}
            xStream.useAttributeFor(Clothes.class, "id");

            products=((List<Clothes>) xStream.fromXML(in));
            in.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return products;
    }

    //向xml文件中写对象数据
    public static void writeProductsToXml(List<Clothes> products){
        try {
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("products.xml"));
            //因为一个xml文件头部是固定的，所以可以单独写上如下一句
            out.write("<?xml version=\"1.0\" encoding=\"utf-8\"?>".getBytes());

            XStream xStream = new XStream(new XppDriver());
            //为xml文件里的根节点标签名即<list> 设置一个别名"list"，如果不设置，生成的xml文件中，根节点会带上包名<.包名.list>
            //所以这里products就可以看作是这个List<Clothes>集合的一个对象：要得到类的class就可以使用：对象.getClass()
            xStream.alias("list", products.getClass());
            //为xml的根节点的子节点clothes设置别名“clothes”
            xStream.alias("clothes", Clothes.class);
            //为某个类设置属性：所要执行类的Class{Clothes.class},然后取这个类里的哪个属性值{id}
            xStream.useAttributeFor(Clothes.class, "id");

            xStream.toXML(products,out);
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<list>
    <clothes id="A0001">
        <brand>VEROMODA</brand>
        <style>连衣裙</style>
        <color>白色</color>
        <size>S</size>
        <num>4</num>
        <price>274.0</price>
        <description>夏季五分袖连衣裙</description>
    </clothes>
    <clothes id="A0002">
        <brand>GAP</brand>
        <style>连衣裙</style>
        <color>黑白色</color>
        <size>S</size>
        <num>19</num>
        <price>164.0</price>
        <description>系带无袖宽松夏季柔软碎花背心裙</description>
    </clothes>
</list>