requesth获取参数

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.setCharacterEncoding("utf-8");
        String token ;
        token=request.getHeader("token");
        System.out.println("当前用户请求头为:"+token);

        String requestURI = request.getRequestURI();
        Enumeration<String> em = request.getParameterNames();

        System.out.println("current request meth:"+requestURI);
        boolean b = em.hasMoreElements();
        if(b){
            String name =  em.nextElement();
            String value = request.getParameter(name);
            System.out.println("form表单请求的参数名称:"+name+"请求的参数值："+value);
        }

        BufferedReader br = request.getReader();
        String str, wholeStr = "";
        while((str = br.readLine()) != null){
            wholeStr += str;
        }
        System.out.println("body--Json中请求的参数名称:"+wholeStr);

    }