请帮忙解释下以下的代码中Terminal terminal=(Terminal)httpRequest.getAttri

请帮忙解释下以下的代码中Terminal terminal=(Terminal)httpRequest.getAttribute(terminal);?Java
@RequestMapping(GetCodeReSend)
@ResponseBody
public Map GetCodeReSend(@RequestParam(mobilePhone)String mobilePhone,
@RequestParam(getCode)String getCode,
HttpServletRequest httpRequest){
HashMap response=new HashMap();
Terminal terminal=(Terminal)httpRequest.getAttribute(terminal);
int checkCode=parcelDao.getGetCodeByPhoneNum(mobilePhone, terminal);
if(checkCode!=-1){
String msg=YouBox:您的取件码是： +checkCode;
SendSMSHelper.send(msg, mobilePhone);
response.put(responseCode, 0);
}else{
response.put(responseCode, 1);
}
return response;
}
}
请帮忙解释下以下的代码中Terminal terminal=(Terminal)httpRequest.getAttribute(terminal);的作用?

得到,request里 绑定到名叫“terminal”的session 的值,
httpRequest.getAttribute（）,就是获取session值,其中挂号里的参数就是session的名字,
这个session,你可以理解像map差不多,一个名字对应一个值