java xml 空节点成对_xStream javaBean转为xml时，怎么保留空节点

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使用一个自定32313133353236313431303231363533e4b893e5b19e31333337613234义的Converter：public class Student{

String name;

int age;

String teacher;

public void setName(String name){

this.name = name;

}

public String getName(){

return name;

}

.......

......//Like that mention other getter and setter method

}

public class StudentConverter implements Converter{

public boolean canConvert(Class clazz) {

return clazz.equals(Test.class);

}

public void marshal(Object value, HierarchicalStreamWriter writer,

MarshallingContext context) {

Student student = (Student ) value;

writer.startNode("name");

writer.setValue(test.getName());

writer.endNode();

writer.startNode("age");

writer.setValue(test.getAge());

writer.endNode();

writer.startNode("teacher");

String teacher = test.getTeacher();

if(teacher == null)

writer.setValue("");

else

writer.setValue(teacher);

writer.endNode();

}

public Object unmarshal(HierarchicalStreamReader reader,

UnmarshallingContext context) {

Student student = new Student();

test.setName(reader.getNodeName());

test.setAge(reader.getNodeName());

test.setTeacher(reader.getNodeName());

return student;

}

}

public class App1{

public static void main(String args[]) {

XStream stream = new XStream(new StaxDriver());

Student st = new Student();

st.setName("ABC");

t.setAge(21);

stream.registerConverter(new StudentConverter());

stream.alias("student", Student.class);

System.out.println(stream.toXML(st));

}

}