XStream入门介绍3
Java 到xml，用toXML()方法。
Xml到Java，用fromXML()方法。
在没有任何设置默认情况下，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。
eg 1:
package com.leadtone.util.xstream;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.xml.DomDriver;public class XstreamDemo {public static void main(String[] args) {XStream xstream = new XStream(new DomDriver());Person joe = new Person("Bill", "Gates");joe.setFaxNumber(new PhoneNumber(101, "83501194"));joe.setMobileNumber(new PhoneNumber(102, "13686447788"));String xml = xstream.toXML(joe);System.out.println(xml);}}?输出结果：
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<com.leadtone.util.xstream.Person> <firstName>Bill</firstName> <lastName>Gates</lastName> <faxNumber> <phoneId>101</phoneId> <phoneNumber>83501194</phoneNumber> </faxNumber> <mobileNumber> <phoneId>102</phoneId> <phoneNumber>13686447788</phoneNumber> </mobileNumber></com.leadtone.util.xstream.Person>
?【注】：这里的最外层标签是<com.leadtone.util.xstream.Person>，而不是<Person>
eg 2：
package com.leadtone.util.xstream;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.xml.DomDriver;public class XstreamDemo {public static void main(String[] args) {XStream xstream = new XStream(new DomDriver());xstream.alias("person", Person.class);//映射Person joe = new Person("Bill", "Gates");joe.setFaxNumber(new PhoneNumber(101, "83501194"));joe.setMobileNumber(new PhoneNumber(102, "13686447788"));String xml = xstream.toXML(joe);System.out.println(xml);}}?结果：
<person> <firstName>Bill</firstName> <lastName>Gates</lastName> <faxNumber> <phoneId>101</phoneId> <phoneNumber>83501194</phoneNumber> </faxNumber> <mobileNumber> <phoneId>102</phoneId> <phoneNumber>13686447788</phoneNumber> </mobileNumber></person>
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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)，单独命名没有意义，还要通过useAttributeFor(Class definedIn, String fieldName) 应用到某个类上。
eg 3：
package com.leadtone.util.xstream;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.xml.DomDriver;public class XstreamDemo {public static void main(String[] args) {XStream xstream = new XStream(new DomDriver());xstream.alias("person", Person.class);xstream.aliasField("fn", Person.class,"firstName");xstream.aliasField("ln", Person.class,"lastName");Person joe = new Person("Bill", "Gates");joe.setFaxNumber(new PhoneNumber(101, "83501194"));joe.setMobileNumber(new PhoneNumber(102, "13686447788"));String xml = xstream.toXML(joe);System.out.println(xml);}}?输出结果：
<person> <fn>Bill</fn> <ln>Gates</ln> <faxNumber> <phoneId>101</phoneId> <phoneNumber>83501194</phoneNumber> </faxNumber> <mobileNumber> <phoneId>102</phoneId> <phoneNumber>13686447788</phoneNumber> </mobileNumber></person>
?eg 4：
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package com.leadtone.util.xstream;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.xml.DomDriver;public class XstreamDemo {public static void main(String[] args) {XStream xstream = new XStream(new DomDriver());xstream.alias("person", Person.class);xstream.aliasField("fn", Person.class,"firstName");xstream.aliasField("ln", Person.class,"lastName");xstream.useAttributeFor(Person.class, "firstName"); //设置属性Person joe = new Person("Bill", "Gates");joe.setFaxNumber(new PhoneNumber(101, "83501194"));joe.setMobileNumber(new PhoneNumber(102, "13686447788"));String xml = xstream.toXML(joe);System.out.println(xml);}}?运行结果：
<person fn="Bill"> <ln>Gates</ln> <faxNumber> <phoneId>101</phoneId> <phoneNumber>83501194</phoneNumber> </faxNumber> <mobileNumber> <phoneId>102</phoneId> <phoneNumber>13686447788</phoneNumber> </mobileNumber></person>
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别名的配置是非常重要的，但是其中有些细节问题很重要，在例子中会专门做详细说明。
另外还有不太常用的方法：
addImplicitCollection(Class ownerType, String fieldName)，去掉集合类型生成xml的父节点。
registerConverter(Converter converter) ，注册一个转换器。
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eg 5：把对象中的map映射为xml
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