RpcContext

关于 RpcContext 的理解，详情见：https://blog.csdn.net/sinat_32502451/article/details/134192733

RpcContext是 Dubbo中的一个类，可以用来获取 Context(上下文)，接着就能获取到 Request、Cookie。

Dubbo获取 Request：

  HttpServletRequest request=  (HttpServletRequest) RpcContext.getContext().getRequest();

Dubbo获取 Cookie数组：

  HttpServletRequest request=  (HttpServletRequest) RpcContext.getContext().getRequest();Cookie[] cookies = request.getCookies();

Dubbo获取 Cookie中的值：

public class RpcContextUtil {/*** 获取cookie中的信息* @param key* @return*/public static String getFromCookie(String key) {String value = "";if (StringUtils.isEmpty(key)) {return value;}//获取requestHttpServletRequest request=  (HttpServletRequest) RpcContext.getContext().getRequest();//从request中获取Cookie数组Cookie[] cookies = request.getCookies();if (cookies == null) {return value;}//从cookie数组中，获取key对应的valuefor (Cookie cookie: cookies) {if (key.equals(cookie.getName())) {value = cookie.getValue();}}//解码，如果不解码，cookie中的空格有时会乱码显示成%20try {value = StringUtils.trim(URLDecoder.decode(value, "utf-8"));} catch (UnsupportedEncodingException e) {log.error("cookie info could not decode.key: {}, value: {}",key, value);}return value;}}