HttpServletRequest request 获取form参数的两种方式

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@RequestMapping(value="/pay",method = RequestMethod.POST)
    public String buildRequest(HttpServletRequest request){
        Map<String,String> parmMap=new HashMap<String,String>();
        //方式一：getParameterMap()，获得请求参数map
        Map<String,String[]> map= request.getParameterMap();
        //参数名称
        Set<String> key=map.keySet();
        //参数迭代器
        Iterator<String> iterator = key.iterator();
        while(iterator.hasNext()){
            String k=iterator.next();
            parmMap.put(k, map.get(k)[0]);
        }
        System.out.println("parmMap====="+parmMap.toString());


        //方式二：getParameterNames()：获取所有参数名称
        Enumeration<String> a = request.getParameterNames();
        String parm=null;
        String val="";
        while(a.hasMoreElements()){
            //参数名
            parm=a.nextElement();
            //值
            val=request.getParameter(parm);
            parmMap.put(parm, val);
        }
        System.out.println("parmMap=========="+parmMap);

        return "";
    }