例如接口請求地址:http://192.168.1.6:8080/api/category/query?pageSize=5&pageNum=1
System.out.println(request.getRequestURL().toString()); //http://192.168.1.6:8080/api/category/query
System.out.println(request.getRequestURI()); // /api/category/query
System.out.println(request.getContextPath());// /api
System.out.println(request.getQueryString()); // pageSize=5&pageNum=1
System.out.println(request.getServletPath());// /category/query
System.out.println(request.getRemoteAddr());// 192.168.1.6
System.out.println(request.getServerPort());// 8080
//getHeader(string name)方法:根據header參數名稱獲取值 ;
//getParameter(name)方法:根據請求參數的名稱獲取對應的值;
//getMethod()方法:HTTP請求的的方法名,默認是GET,也可以指定PUT或POST;