xstream的Converter的使用

在网上看了下，有关xstream的Converter的使用的例子很少，这里做个简单的应用举例

文件格式如下：

<list>
      <mapper neType="2g">
          <sqlByType></sqlByType>
         <sqlById></sqlById>
         <types>
                 <include>BTS</include>
         </types>
      </mapper>
      <mapper neType="3g">
          <types>
                <include>NODEB</include>
          </types>
      </mapper>
</list>

实体类定义如下：

@XStreamAlias("mapper")
public class NeTypeMapper {
         @XStreamAsAttribute
         public String neType ;

         @XmlElement
         public String sqlByType ;

         @XmlElement
         public String sqlById ;

         @XStreamAlias("types")
         public List<String> includeTypes = new ArrayList<String>();
}

转换器：

static class ListConverter extends AbstractCollectionConverter {

public ListConverter(Mapper mapper) {
super(mapper);
}

@Override
         public boolean canConvert(Class type) {
                   return type.equals(ArrayList.class);
           }

@Override
          public void marshal(Object source, HierarchicalStreamWriter writer,
                       MarshallingContext context) {
                List<String> list = (List<String>)source;
                 ListIterator<String> iter = list.listIterator() ;
                 String value = null ;
                 while(iter.hasNext()){
                       value = iter.next() ;
                       ExtendedHierarchicalStreamWriterHelper.startNode(writer,"include",List.class);
                       writer.setValue(value);
                       writer.endNode();
            }
  }

@Override
  public Object unmarshal(HierarchicalStreamReader reader,
        UnmarshallingContext context) {
                String nodename = reader.getNodeName() ;
                //System.out.println(nodename);
                List<String> list = new ArrayList<String>();
                while(reader.hasMoreChildren()){
                         reader.moveDown();
                      nodename = reader.getNodeName() ;
                    //System.out.println(nodename+"-->"+reader.getValue());
                     list.add(reader.getValue()) ;
                     reader.moveUp();
                }
                 return list;
       }
}

使用方式：

   XStream xs = new XStream() ;
   xs.processAnnotations(NeTypeMapper.class);
   xs.registerLocalConverter(NeTypeMapper.class, "includeTypes",
          new ListConverter(
                    new DefaultMapper(XStream.class.getClassLoader())) );
    File file = new File(filePath) ;  //filePath:文件的路径
    try {
    List<NeTypeMapper> list = (List<NeTypeMapper>)xs
                            .fromXML(new FileInputStream(file)) ;

时间： 2024-10-11 07:53:07

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