从Java代码获取HttpServletRequest(请求)对象

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 获取请求的方法
    String method = request.getMethod();
    // 获取请求的URL
    StringBuffer requestURL = request.getRequestURL();
    // 获取请求的URI
    String requestURI = request.getRequestURI();
    // 获取请求的查询字符串
    String queryString = request.getQueryString();
    // 获取请求参数的值
    String paramValue = request.getParameter("paramName");
    // 获取请求参数的名称列表
    Enumeration<String> paramNames = request.getParameterNames();
    // 获取请求参数的Map对象
    Map<String, String[]> paramMap = request.getParameterMap();
    // 获取请求头的值
    String headerValue = request.getHeader("headerName");
    // 获取请求头的名称列表
    Enumeration<String> headerNames = request.getHeaderNames();
    // 获取请求中的Cookie对象数组
    Cookie[] cookies = request.getCookies();
}

@RequestMapping(value = "/user/{id}", method = RequestMethod.GET)
public String getUser(@PathVariable("id") Long id, @RequestParam(value = "name", required = false) String name, Model model) {
    User user = userService.getUserById(id);
    model.addAttribute("user", user);
    return "user";
}