用XStream转换复杂XML
针对标签里面直接使用值的xml，比如
?<IDS>
????? <ID>1234534</ID>
????? <ID>1111111111</ID>
??? </IDS>
?
还有节点既有属性又有值的xml，比如
<INPUT>
? <RAW_SQL TYPE="PERSON">select id from person</RAW_SQL>
</INPUT>
需要一个转换器来转换，转换器代码如下：
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.zhhy.server.beans.RawSQL;
public class RawSQLConverter implements Converter {
?@SuppressWarnings("rawtypes")
?public boolean canConvert(Class clazz) {
??return clazz.equals(RawSQL.class);
?}
?public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext acontext) {
??RawSQL rawSQL = (RawSQL) value;
??if (rawSQL != null) {
???if (null != rawSQL.getType()) {
????writer.addAttribute("TYPE", rawSQL.getType());
???}
???writer.setValue(rawSQL.getRawSql() == null ? "" : rawSQL.getRawSql());
??}
?}
?public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext arg1) {
??RawSQL rawSql = new RawSQL();
??String type = reader.getAttribute("TYPE");
??rawSql.setType(type);
??String value = reader.getValue();
??rawSql.setRawSql(value);
??return rawSql;
?}
}
类的annotation配置如下：
@XStreamAlias("RAW_SQL")
@XStreamConverter(RawSQLConverter.class)
public class RawSQL {
?@XStreamAsAttribute
?@XStreamAlias("TYPE")
?private String type;
?private String rawSql;
?下面省略了getter和setter方法
}
?
?
后记：（2012-05-18日添加）
如果对象中定义的类型与实际类型不一致，比如定义的是Object类型，但是实际初始化的对象是其他类型，转换出来的xml文件都会加上class="实际类型"属性，举例：<PERSON class="PERSON">...</PERSON>
有两种方法去掉这个属性
1，?xstream.alias("field name", Interface.class, ActualClassToUse.class);
2，?xstream.aliasSystemAttribute(null, "class");
我选择用后面一种，这样会把所有class属性去掉，如果只去掉某些类的这个多余的属性，用第一种方式即可。
