xstream不包含某些字段，即使它们有getter/setter

@XStreamAlias("myObject")
public class MyObject {
    private String field1;
    private String field2;
    
    // getter and setter methods
    
    @XStreamAlias("__IGNORE__")
    public String getField2() {
        return field2;
    }
    
    public void setField2(String field2) {
        this.field2 = field2;
    }
}

public class MyObjectConverter implements Converter {
    @Override
    public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
        MyObject myObject = (MyObject) source;
        writer.startNode("field1");
        writer.setValue(myObject.getField1());
        writer.endNode();
        // 不处理field2
    }

    @Override
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        MyObject myObject = new MyObject();
        reader.moveDown();
        myObject.setField1(reader.getValue());
        reader.moveUp();
        // 不处理field2
        return myObject;
    }

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

XStream xstream = new XStream();
xstream.registerConverter(new MyObjectConverter());