xstream解析xml中有很多重复的field的xml
有些情况下，xml文件是这样的
<body>
<entryList>
<field name="forumName">General Discussion</field>
<field name="createDate">2013-09-11 12:37:02</field>
</entryList>
</body>
对于这种xml使用xml解析工具解析是很好处理的，但是对xml绑定工具就不能直接绑定了。需要稍作修改。
如果使用xstream，就要添加一个转化器实现Converter接口。先把接口贴出来：
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;
public class FieldConverter implements Converter {
@Override
public boolean canConvert(@SuppressWarnings("rawtypes") Class type) {
if (type == Field.class) {
return true;
}
return false;
}
@Override
public void marshal(Object source, HierarchicalStreamWriter writer,
MarshallingContext context) {
Field field = (Field)source;
//writer.startNode("field");
writer.addAttribute("name", field.getName());
writer.setValue(field.getValue());
//writer.endNode();
}
@Override
public Object unmarshal(HierarchicalStreamReader reader,
UnmarshallingContext context) {
Field field = new Field();
String name = reader.getAttribute("name");
field.setName(name);
String value = reader.getValue();
field.setValue(value);
return field;
}
}下面是两个POJO封装类：
import java.util.List;
public class Body {
List<Field> entryList;
public Body() {
super();
}
public List<Field> getEntryList() {
return entryList;
}
public void setEntryList(List<Field> entryList) {
this.entryList = entryList;
}
}
下面这个Filed类用来封装里面的field域，name对应name属性值，value对应filed的值。标准的做法应该要有一个<value>标签的。
public class Field {
String name;
String value;
public Field() {
super();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
下面的代码就是main方法，用来测试的：
import java.util.ArrayList;
import java.util.List;
import com.thoughtworks.xstream.XStream;
public class TestXml {
public static void main(String[] aa) {
List<Field> entryList = new ArrayList<Field>();
Field field = new Field();
field.setName("forumName");
field.setValue("General Discussion");
entryList.add(field);
Field field2 = new Field();
field2.setName("createDate");
field2.setValue("2013-09-11 12:37:02");
entryList.add(field2);
Body body = new Body();
body.setEntryList(entryList);
XStream xstream = new XStream();
xstream.registerConverter(new FieldConverter());
xstream.alias("field", Field.class);
xstream.alias("body", Body.class);
String xml = xstream.toXML(body);
System.err.println(xml);
Body body2 = (Body)xstream.fromXML(xml);
System.out.println(body2);
}
}
如果不使用FieldConverter，通过指定别名和属性，输出的xml value值是带有标签的，不符合规则。使用了就会输出带field的属性和值的，而value是直接作为field的值，不会在出现<value>标签了。