mapping.getInputForward()与mapping.getInput

奇怪为什么登陆失败的时候没有错误提示.这个问题困扰了N久

仔细看了下,发现在处理登陆失败情况跳转的页面原代码用的是mapping.getInputForward();
断点跟踪了一下这句运行好以后
mapping.getInputForward();是个什么东西?!百度了下原来和这个是
获取action当中input中的值对应的地址

<action  path="/test"
            type="org.apache.struts.webapp.example.TestAction"
            name="testForm"
            scope="request"
         input="testInput">
<forward name="testInput"                path="/testInput.jsp"/>
</action>
getInputForward();获取的就是action中input里的testinput,通过testinput又找到forward里这个别名对应的path/testInput.jsp
mapping.getInput()获取的是action中input里的testinput字符串
到这里一切就明了了.

为什么用mapping.getInputForward();了以后就没有错误提示信息呢因为struts里没有input的配置
配置..运行..OK

loginAction代码
public ActionForward login(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
  MemLoginForm memLoginForm = (MemLoginForm) form;
  MemDAO service = new MemDAOImpl();
  ActionForward forward = null;
  ActionMessages msgs = new ActionMessages();
  try{
Member mem = service.memLogin(memLoginForm.getLoginName(), memLoginForm.getLoginPwd());
if (mem!=null){
request.getSession().setAttribute("member", mem);
forward = new ActionForward("/mer.do?method=browseIndexMer");
}else{
//等价语句
//forward = new ActionForward("/mer.do?method=browseIndexMer");
forward = mapping.getInputForward();
msgs.add("loginError",new ActionMessage(Constants.ADMIN_LOGINERROR_KEY));
saveErrors(request, msgs);
}
  }catch(Exception ex){
logger.info("在执行LoginAction类中的login方法时出错：\n");
ex.printStackTrace();
  }
  return forward;
}
转载自：http://www.tiansky.net:8892/DBbbs/viewthread.jsp?tid=236&extra=page%3D1