xstream简单使用案例

XStream主要用来做Java对象和XML 之间的转换器，转换过程是双向的。核心类就是XStream 类，下面就来简单介绍一下XStream最常用，也是最简单的使用

主要有两个方法

toXML()方法。//将bean转换为xml

fromXML()方法。//将xml转换为bean

默认情况下，java 到xml 的映 射，是java 成员名对应xml 的元素名，java 类的全名对

应xml 根元素的名字。而实际中，往往是xml 和java 类都有了，要完成相互转换，必须进行别名映射。

别名配置包含三种情况：

1、类别名，用alias(String name, Class type)。

2、 类成员别名，用aliasField(String alias, Class definedIn, String fieldName)

3、 类成员作为属性别名，用 aliasAttribute(Class definedIn, String attributeName, String alias)，

 好了，现在上代码；

1、   定义Page类

@XStreamAlias("Page")

public class Page {

    public  AddressBook addressBook;

    public AddressBook getAddressBook() {

        return addressBook;

    }

    public void setAddressBook(AddressBook addressBook) {

        this.addressBook = addressBook;

    }

}

2、   定义AddressBook类

@XStreamAlias("AddressBook")

public class AddressBook  {

     private List<com.xtream.Person> persons;

    public List<Person> getPersons() {

        return persons;

    }

    public void setPersons(List<Person> persons) {

        this.persons = persons;

    }

}

3、   定义Person类

@XStreamAlias("Person")

public class Person   {

    @XStreamAsAttribute

    public String name;

    @XStreamAsAttribute

    public String age;

    @XStreamAsAttribute

    public String sex;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getAge() {

        return age;

    }

    public void setAge(String age) {

        this.age = age;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

}

4、测试入口

public class Main {

    public static void main(String[] args) {

        System.out.println("-----------------写xml文件-------------------");

        List list = new ArrayList();

        for (int i = 0; i < 10; i++) {

            Person address = new Person();

            address.setName("张三");

            address.setAge("26");

            address.setSex("男");

            list.add(address);

        }

        AddressBook addes = new AddressBook();

        addes.setPersons(list);

        Page page = new Page();

        page.setAddressBook(addes);

         Util.makeXML(page);

        Util.writeXML(Util.makeXML(page));

         System.out.println("-----------------xml文件内容-------------------");

          System.out.println(Util.makeXML(page));

        System.out.println("-----------------读xml文件(1) dom4j解析-------------------");

        File f = new File("d://testXtram.xml");

        try {

            InputStream in = new FileInputStream(f);

            Page page1 = Util.readXML(in);

            for (int i = 0; i < page1.getAddressBook().getPersons().size(); i++) {

                Person person = page1.getAddressBook().getPersons().get(i);

                System.out.println(person.getName() + "  " + person.getAge() + "  " + person.getSex());

            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();        }

          System.out.println("-----------------读xml文件(2) xstream转换-------------------");

        File f2 = new File("d://testXtram.xml");

        try {

            InputStream in = new FileInputStream(f2);

            Page page2 = Util.readXML2(in);

            for (int i = 0; i < page2.getAddressBook().getPersons().size(); i++) {

                Person person = page2.getAddressBook().getPersons().get(i);

                System.out.println(person.getName() + "  " + person.getAge() + "  " + person.getSex());

            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();          }

    }

}

5、public class Util {

    public static String makeXML(Page page) {

        XStream stream = new XStream();

        stream = setXStream(stream);

        String str = stream.toXML(page);

        return str;

    }

    public static void writeXML(String s) {

        FileWriter fw = null;

        try {

            fw = new FileWriter("d://testXtram.xml");

            fw.write(s, 0, s.length());

            fw.flush();

           System.out.println("写文件成功!");

        } catch (IOException e) {

            e.printStackTrace();        }

    }

    public static Page readXML2(InputStream inputStream) {

        XStream stream = new XStream(new DomDriver());

        stream = setXStream(stream);

        return (Page) stream.fromXML(inputStream);

    }

    private static XStream setXStream(XStream stream) {

        stream.alias("Page", Page.class);

        stream.alias("Person", Person.class);

        stream.aliasAttribute(Person.class, "name", "name");

        stream.aliasAttribute(Person.class, "age", "age");

        stream.aliasAttribute(Person.class, "sex", "sex");

        stream.alias("AddressBook", AddressBook.class);

        return stream;

    }

    public static Page readXML(InputStream inputStream) {

         System.out.println("开始读取xml文件并封装为对象!");

        String str = getInputStreamToString(inputStream);

        Page page = new Page();

        AddressBook addressBook = new AddressBook();

        SAXReader reader = new SAXReader();

        Document document = null;

        try {

            document = reader.read(new StringReader(str));

            Element root = document.getRootElement();

            Element root2 = root.element("addressBook").element("persons");

            List<Person> persons = new ArrayList<Person>();

            for (Iterator item = root2.elementIterator(); item.hasNext();) {

                Element element = (Element) item.next();

                Person person = new Person();

                person.setName(String.valueOf(element.element("name").getText()));

                person.setAge(String.valueOf(element.element("age").getText()));

                person.setSex(String.valueOf(element.element("sex").getText()));

                persons.add(person);

            }

            addressBook.setPersons(persons);

        } catch (DocumentException e) {

            e.printStackTrace();          }

        page.setAddressBook(addressBook);

        return page;

    }

    public static String getInputStreamToString(InputStream inputStream) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

        StringBuilder sb = new StringBuilder();

        String line = null;

        try {

            while ((line = reader.readLine()) != null) {

                sb.append(line + "\n");

            }

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

        }

        return sb.toString();

    }

}

到这里相信都应该明白了怎么用了吧，如有需要代码的话请联系我：QQ:429472944