Spring 3 Custom Editor字段替换

UserVO {
  long id;
  String username;
}

public class UserVOEditor extends PropertyEditorSupport {

@Override
public void setAsText(String text) throws IllegalArgumentException {
    Preconditions.checkArgument(text != null,"Null argument supplied when parsing UserVO");
    String[] txtArray = text.split("\#");
    Preconditions.checkArgument(txtArray.length == 2, "Error parsing UserVO. Expected: id#username");
    long parsedId = Long.valueOf(txtArray[0]);
    String username = txtArray[1];
    UserVO uvo = new UserVO();
    uvo.setUsername(username);
    uvo.setId(parsedId);
    this.setValue(uvo);
}

@Override
public String getAsText() {
    UserVO uvo = (UserVO) getValue();
    return uvo.getId()+'#'+uvo.getUsername();
}

@InitBinder
public void initBinder(ServletRequestDataBinder binder) {
    binder.registerCustomEditor(UserVO.class, new UserVOEditor());
}

ModelVO { 
           Set<UserVO> users = new HashSet<UserVO>();
}

ModelVO {
          Set<String> users (linkedHashSet)
}

for(UserVO uvo : myModel.getUser()){ .. }