XML解析与Bean转换，XStream-工具类

XML解析与Bean转换，XStream-工具类XStream简单介绍 XStream是一个开源项目，一套简单实用的类库，用于序列化对象与XML对象之间的相互转换。将XML文件内容解析为一个对象或将一个对象序列化为XML文件。XStream可以用于JDK1.3以上的版本使用，我是在JDK1.5下使用它的。XStream的相关信息可以到http://xstream.codehaus.org/下查看，它有专门的JavaDoc，可以方便的阅读Xstream的函数及方法。XStream中主要的类为XStream，它用于序列化对象与XML 对象之间的相互转换。简单的使用它就可以解决很多问题。XStream中主要的方法也是我用的比较多的是fromXML()和toXML()。fromXML用于从XML中将对象解析出来。toXML用于将对象序列化为XML文件。在XStream中我还使用HierarchicalStreamWriter，HierarchicalStreamReader，createObjectInputStream()，createObjectOutputStream()，主要是用于对象的输入输出。下面我们来研究下XStream的工作方式。利用XStream在Java对象和XML之间相互转换 XStream是个好东西，可以方便在Java对象和XML之间相互转换，效率和可读性都非常高，下面是我写的一个测试的例子，放出来一块看看。 需要的jar包如下：xpp3_min-1.1.4c.jarxstream-1.3.jar 目标：将Persons对象转换xml，再将xml转化为Persons对象。 实现源码列表： package com.lavasoft.demo3;import com.thoughtworks.xstream.XStream;import java.util.List;import java.util.ArrayList;import java.util.Iterator;import java.io.StringReader;import java.io.FileReader;import java.io.File;import java.io.FileNotFoundException;import org.dom4j.io.SAXReader;import org.dom4j.Document;import org.dom4j.Node;import org.dom4j.DocumentException;/*** Created by IntelliJ IDEA.* File: demo3.java* User: leizhimin* Date: 2008-3-4 14:44:03*/public class XStreamDemo {    public staticvoid main(String args[]) {        testBean2XML();    }    /**     * 生成一个Persons对象     *     * @return Persons对象    */    public static Persons getPersons() {        Address add1 = new Address("type1","郑州市经三路财富广场1");        Address add2 = new Address("type2","郑州市经三路财富广场2");        List<Address> addlist1 = new ArrayList<Address>();        addlist1.add(add1);        addlist1.add(add2);        Address add3 = new Address("type3","郑州市经三路财富广场3");        Address add4 = new Address("type4","郑州市经三路财富广场4");        List<Address> addlist2 = new ArrayList<Address>();        addlist2.add(add3);        addlist2.add(add4);        Addresses addes1 = new Addresses(addlist1);        Addresses addes2 = new Addresses(addlist2);        Person person1 = new Person(addes1,"6666554", "lavasoft","man");        Person person2 = new Person(addes2,"7777754", "yutian","man");        List<Person> listPerson = new ArrayList<Person>();        listPerson.add(person1);        listPerson.add(person2);        Persons persons = new Persons(listPerson,"001");        return persons;    }    /**     * 利用XStream在Java对象和XML之间相互转换    */    public staticvoidtestBean2XML() {        System.out.println("将Java对象转换为xml！\n");        Persons persons = getPersons();        XStream xstream = new XStream(); //

需要XPP3库

[/code]

     //XStream xstream = new XStream(new DomDriver());//不需要XPP3库     //
XStream xstream=newXStream(newStaxDriver());//不需要XPP3库开始使用Java6

[/code]        xstream.alias("address", Address.class);//为类重命名：Xstream.alias()方法        xstream.alias("addresses", Addresses.class);        xstream.alias("person", Person.class);        xstream.alias("persons", Persons.class);        String xml = xstream.toXML(persons);        System.out.println(xml);        System.out.println("\n将xml转换为Java对象！");        Persons cre_person = (Persons) xstream.fromXML(xml);        System.out.println(cre_person.toString());    }} publicclass Persons {    private String type;    private List<Person> listPerson;    public Persons(List<Person> listPerson, String type) {        this.listPerson = listPerson;        this.type = type;    }    public String getType() {        return type;    }    public void setType(String type) {        this.type = type;    }    public List<Person> getListPerson() {        return listPerson;    }    public void setListPerson(List<Person> listPerson) {        this.listPerson = listPerson;    }    public String toString() {        StringBuffer sb=new StringBuffer();        for(Iterator it=listPerson.iterator();it.hasNext();){            Person p=(Person)it.next();            sb.append(it.toString());        }        return "Persons{" +                "type='" + type + '\'' +                ", listPerson=" + sb.toString() +                "}\n";    }} publicclass Person {    private String name;    private String sex;    private String tel;    private Addresses addes;    public Person(Addresses addes, String name, String sex, String tel) {        this.addes = addes;        this.name = name;        this.sex = sex;        this.tel = tel;    }    public Addresses getAddes() {        return addes;    }    public void setAddes(Addresses addes) {        this.addes = addes;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }    public String getTel() {        return tel;    }    public void setTel(String tel) {        this.tel = tel;    }    public String toString() {        return "Person{" +                "addes=" + addes.toString() +                ", name='" + name + '\'' +                ", sex='" + sex + '\'' +                ", tel='" + tel + '\'' +                "}\n";    }} publicclass Addresses {    private List<Address> listAdd;    public Addresses(List<Address> listAdd) {        this.listAdd = listAdd;    }    public List<Address> getListAdd() {        return listAdd;    }    public void setListAdd(List<Address> listAdd) {        this.listAdd = listAdd;    }    public String toString() {        StringBuffer sb=new StringBuffer();        for(Iterator it=listAdd.iterator();it.hasNext();){            Address add=(Address)it.next();            sb.append(add.toString());        }        return "Addresses{" +                "listAdd=" + sb.toString() +                "}\n";    }} publicclass Address {    private String addType;    private String place;    public Address(String addType, String place) {        this.addType = addType;        this.place = place;    }    public String getAddType() {        return addType;    }    public void setAddType(String addType) {        this.addType = addType;    }    public String getPlace() {        return place;    }    public void setPlace(String place) {        this.place = place;    }    public String toString() {        return "Address{" +                "addType='" + addType + '\'' +                ", place='" + place + '\'' +                "}\n";    }} 运行测试类XStreamDemo，打印出结果： 将Java对象转换为xml！<persons>  <type>001</type>  <listPerson>    <person>      <name>6666554</name>      <sex>lavasoft</sex>      <tel>man</tel>      <addes>        <listAdd>          <address>            <addType>type1</addType>            <place>郑州市经三路财富广场1</place>          </address>          <address>            <addType>type2</addType>            <place>郑州市经三路财富广场2</place>          </address>        </listAdd>      </addes>    </person>    <person>      <name>7777754</name>      <sex>yutian</sex>      <tel>man</tel>      <addes>        <listAdd>          <address>            <addType>type3</addType>            <place>郑州市经三路财富广场3</place>          </address>          <address>            <addType>type4</addType>            <place>郑州市经三路财富广场4</place>          </address>        </listAdd>      </addes>    </person>  </listPerson></persons>将xml转换为Java对象！Persons{type='001', listPerson=java.util.AbstractList$Itr@1cde100java.util.AbstractList$Itr@1cde100}Process finished with exit code 0四、XStream对JSON的支持jettison-1.3.3.jarxStream对JSON也有非常好的支持，它提供了2个模型驱动。用这2个驱动可以完成Java对象到JSON的相互转换。使用JettisonMappedXmlDriver驱动，将Java对象转换成json，需要添加jettison.jar1、 用JettisonMappedXmlDriver完成Java对象到JSON的转换

/**

* <b>function:</b>XStream结合JettisonMappedXmlDriver驱动，转换Java对象到JSON

* 需要添加jettison jar

* @author hoojo

* @createDate Nov 27, 2010 1:23:18 PM

*/

@Test

public void writeEntity2JETTSON() {

public static void main(String[] args) {                    System.out.println("\n将java转换为xml 对象！");            List list = new ArrayList();                        WebPic pic = new WebPic();            pic.setId("0001");            pic.setName("高兴飞");            pic.setPicUrl("http://baidu.com");            list.add(pic);                        Role role=new Role();            role.setId("002");            role.setRolename("肥沃");            list.add(role);             //将对象转化为xml            String strxml="";            XStream xstream = new XStream(new JettisonMappedXmlDriver());            xstream.setMode(XStream.NO_REFERENCES);//设置reference模型,不引用            xstream.alias("webpic", WebPic.class);            xstream.alias("role", Role.class);            for(Object obj:list){                strxml+=xstream.toXML(obj)+"\n";            }            System.out.println(strxml);      }

}

运行后结果如下：将java转换为xml 对象！{"webpic":{"id":"0001","name":"高兴飞","picUrl":"http:\/\/baidu.com","rank":0}}{"role":{"id":"002","rolename":"肥沃"}}