Dubbo之 RpcContext

RpcContext

關於 RpcContext 的理解，詳情見：https://blog.csdn.net/sinat_32502451/article/details/134192733

RpcContext是 Dubbo中的一個類，可以用來獲取 Context(上下文)，接着就能獲取到 Request、Cookie。

Dubbo獲取 Request：

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

Dubbo獲取 Cookie數組：

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

Dubbo獲取 Cookie中的值：

public class RpcContextUtil {

    /**
     * 獲取cookie中的信息
     * @param key
     * @return
     */
    public static String getFromCookie(String key) {
        String value = "";
        if (StringUtils.isEmpty(key)) {
            return value;
        }
        //獲取request
        HttpServletRequest request=  (HttpServletRequest) RpcContext.getContext().getRequest();
        //從request中獲取Cookie數組
        Cookie[] cookies = request.getCookies();
        if (cookies == null) {
            return value;
        }
        //從cookie數組中，獲取key對應的value
        for (Cookie cookie: cookies) {
            if (key.equals(cookie.getName())) {
                value = cookie.getValue();
            }
        }
        //解碼，如果不解碼，cookie中的空格有時會亂碼顯示成%20
        try {
            value = StringUtils.trim(URLDecoder.decode(value, "utf-8"));
        } catch (UnsupportedEncodingException e) {
            log.error("cookie info could not decode.key: {}, value: {}",key, value);
        }
        return value;
    }

}