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    @RequestMapping(value = "login")
    public String test(HttpServletRequest request,HttpServletResponse response, ModelMap map) {}
    public String test1(User u) {}
    public String test2() {}
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Object[] args = resolveHandlerArguments(handlerMethodToInvoke, handler, webRequest, implicitModel);
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        protected Object resolveStandardArgument(Class parameterType, NativeWebRequest webRequest) throws Exception {}
            else if (ServletResponse.class.isAssignableFrom(parameterType)) {}
            else if (HttpSession.class.isAssignableFrom(parameterType)) {}
            else if (Principal.class.isAssignableFrom(parameterType)) {}
            else if (Locale.class.equals(parameterType)) {}
            else if (InputStream.class.isAssignableFrom(parameterType)) {}
            else if (Reader.class.isAssignableFrom(parameterType)) {}
            else if (OutputStream.class.isAssignableFrom(parameterType)) {}
            else if (Writer.class.isAssignableFrom(parameterType)) {}
            return super.resolveStandardArgument(parameterType, webRequest);
        }
Èç¹ûÆ¥Å䣬ÔòÖ±½Ó·µ»Ø²ÎÊý£¬Èç¹û²»Æ¥Å䣬return WebArgumentResolver.UNRESOLVED;¡¾Object UNRESOLVED = new Object();¡¿£¬È»ºó¼ÌÐøÕÒ£º
                    Class paramType = methodParam.getParameterType();
                    if (Model.class.isAssignableFrom(paramType) || Map.class.isAssignableFrom(paramType)) {}
                    else if (SessionStatus.class.isAssignableFrom(paramType)) {}
                    else if (Errors.class.isAssignableFrom(paramType)) {}
                    else if (BeanUtils.isSimpleProperty(paramType)) {}
                    else {}
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         ÔÚÕâ¸ö²ÎÊý×¢Èë¹ý³ÌÖУ¬ÓÐÀàËÆresolvePathVariable£¬resolveRequestParamµÈ·½·¨£¬Èç¹ûÊÇPOJOµÄ×¢È룬Ôòµ÷ÓÃ
         resolveModelAttribute(attrName, methodParam, implicitModel, webRequest, handler);Õâ¸ö·½·¨×¢ÈëÊôÐÔÉú³ÉPOJO¡£
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1. Controller·½·¨µÄ²ÎÊýûÓÐ˳Ðò£¬¶¼¿ÉÒÔ±»×¢Èë
2, Èç¹û´úÂë
    public String test(User u1, User u2) {}
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3.public String test(@RequestParam("a") String str, User u1) {}
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4.public String test( User u1, CopyOfUser cu) {}
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5.@RequestParam(value="username")ĬÈÏΪÐèÒª£¬Èç¹ûÌá½»±íµ¥ÖÐûÓÐÕâ¸ö²ÎÊý£¨getParameterValues£©£¬»áraiseÒ»¸öÒì³££¬Õâ¸öÒì³£±»catch£¬server»á·µ»Ø400´íÎó.
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