Question

请各位高手指点 小弟初学 上午写了个SSH架构下的小功能 但是老报空指针异常 找不出问题出哪里了，寒死。

/*-----------------------Action文件---------------*/
public class LogonAction extends StrutsAction{

private static String LOGONSUCSSES ="logonsucsses";

private static String LOGONERROR ="logonerror";

private static String QUIT = "quit";

private LogonServiceImpl logonServiceImpl;

public ActionForward logon(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){

String usn = (String)((LogonForm)form).getUsername();
String pwd = (String)((LogonForm)form).getPassword();

System.out.println(usn+" 000000000000000 "+pwd);

if(logonServiceImpl.goLog(usn,pwd)){
return mapping.findForward(LOGONSUCSSES);
}else
return mapping.findForward(LOGONERROR);
}

public ActionForward quit(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
return mapping.findForward(QUIT);

}
}
/*---------------------------------------service文件：----------------------------------------*/
public class LogonServiceImpl implements LogonService{

private LogonDAO logonDAO;

public boolean goLog(String username,String password){

if(username != null && !"".equals(username.trim()) && password !=null && !"".equals(password.trim())){
Logon logon = logonDAO.logQry(username);
String un = logon.getUsername();
String pd = logon.getPassword();
if(un.trim().equals(username.trim()) && pd.trim().equals(password.trim())){
return true;
}
System.out.println(un+"++++++++++++++++++"+pd);
}
return false;
}
}
/*------------------------------DAO-------------------------------*/
public class LogonDAO extends HibernateDaoSupport implements IlogonDAO {

private JdbcTemplate jdbcTemplate;

public Logon logQry(String username){

Logon po = (Logon)getHibernateTemplate().get(Logon.class, username);

return po;
}
}

ps：通过接口暴露的方法，不晓得这个写对没有，如果有错也请高手指出 拜谢！！

Answer 1

logonServiceImpl、logonDAO没有注入

即没有实现set方法