Xstream --- 转换器

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XStream允许从无到有写入转换器，这样开发人员可以编写一个完全新的实现，如何对象序列化到XML，反之亦然。转换器接口提供了三种方法。

canConvert - 检查支持的对象类型的序列化。
marshal - 序列化对象到XML。
unmarshal - 从XML对象反序列化

package com.xstream.convert;

import java.util.ArrayList;
import java.util.List;

import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.xstream.vo1.Address;
import com.xstream.vo1.Addresses;

public class XstreamConvert implements Converter{
   //检查支持的对象类型的序列化
   public boolean canConvert(Class object) {
          return object.equals(Addresses.class);
   }
   //序列化对象到XML
   public void marshal(Object value, HierarchicalStreamWriter writer,MarshallingContext context) {
          Addresses addresses = (Addresses) value;
          List list = addresses.getListAdd();
          writer.startNode("name");
          writer.setValue(addresses.getListAdd().get(0).getPlace() + "," + addresses.getListAdd().get(0).getAddType());
          writer.endNode();

   }
   //从XML对象反序列化
   public Object unmarshal(HierarchicalStreamReader reader,
           UnmarshallingContext context) {
          reader.moveDown();
          String[] nameparts = reader.getValue().split(",");
          Addresses addresses = new Addresses(new ArrayList<Address>());
          reader.moveUp();
          return addresses;
   }

}

package com.xstream.demo1;

import java.util.ArrayList;
import java.util.List;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.StaxDriver;
import com.xstream.convert.XstreamConvert;
import com.xstream.vo1.Address;
import com.xstream.vo1.Addresses;

public class XstreamConvertDemo {
   public static void main(String[] args) {
       XstreamConvertDemo tester = new XstreamConvertDemo();
         XStream xstream = new XStream(new DomDriver());
         Addresses addresses = tester.getAddressDetails();
         xstream.autodetectAnnotations(true);
         xstream.registerConverter(new XstreamConvert());
         //Object to XML Conversion
         String xml = xstream.toXML(addresses);
         System.out.println(xml);

   }
     private static Addresses getAddressDetails(){
       List<Address> list = new ArrayList<Address>();
       Address address1 = new Address("t1", "p1");
       Address address2 = new Address("t2", "p2");
       list.add(address1);
       list.add(address2);
       Addresses addresses = new Addresses(list);
         return addresses;
      }
}

输出：

<com.xstream.vo1.Addresses>
<name>p1,t1</name>
</com.xstream.vo1.Addresses>

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