XML/JSON的类库，Xstream!

XML/JSON的类库，Xstream!

XML/JSON的操作类库， codehaus的xstream，很简单的在xml/json和java对象间转换。

1、所需jar包： xstream-[version].jar 和 xpp3-[version].jar 。xpp3不是必须的，也可以用标准的JAXP DOM parser 来代替，如：

XStream xstream  =   new  XStream( new  DomDriver());  //  does not require XPP3 library

另外，通过 alias可实现xml属性的支持。更多功能，请参阅 Tutorial 。

2、XML转换代码片段：
Class 转换为 xml 的代码片段:

XStream xstream = new XStream();

xstream.alias("person", Person.class);

xstream.alias("phonenumber", PhoneNumber.class);

Person joe  =   new  Person( " Joe " ,  " Walnes " );
joe.setPhone( new  PhoneNumber( 123 ,  " 1234-456 " ));
joe.setFax( new  PhoneNumber( 123 ,  " 9999-999 " ));
String xml  =  xstream.toXML(joe);

The resulting XML looks like this:

< person >
   < firstname > Joe </ firstname >
   < lastname > Walnes </ lastname >
   < phone >
     < code > 123 </ code >
     < number > 1234-456 </ number >
   </ phone >
   < fax >
     < code > 123 </ code >
     < number > 9999-999 </ number >
   </ fax >
</ person >

xml转换为java类的代码片段:

Person newJoe  =  (Person)xstream.fromXML(xml);

3、JSON

另需jar包:jettison.jar 、stax-api.jar。JSON Turorial 。

Write to json:

package  org.sensatic.json.test;

import  com.thoughtworks.xstream.XStream;
import  com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;

public   class  WriteTest {
     public   static   void  main(String[] args) {
        Product product  =   new  Product( " Banana " ,  " 123 " ,  23.00 );
        XStream xstream  =   new  XStream( new  JettisonMappedXmlDriver());
        xstream.alias( " product " , Product. class );
        System.out.println(xstream.toXML(product));    
    }
}

Read from json:

package  org.sensatic.json.test;

import  com.thoughtworks.xstream.XStream;
import  com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;

public   class  ReadTest {
     public   static   void  main(String[] args) {
        String json  =   " {\ " product\ " :{\ " name\ " :\ " Banana\ " ,\ " id\ " :\ " 123 \ ""
             +   " ,\ " price\ " :\ " 23.0 \ " }} " ;
            
        XStream xstream  =   new  XStream( new  JettisonMappedXmlDriver());
        xstream.alias( " product " , Product. class );
        Product product  =  (Product)xstream.fromXML(json);
        System.out.println(product.getName());
    }
}

And that's how simple XStream is!