Spring MVC中如何通过RequestContextHolder类获取HttpServletRequest和HttpSession

package com.microfocus.g11n.openl10n.utils;

import com.hp.ccue.identity.user.idm.domain.IdmUser;
import com.microfocus.g11n.openl10n.constants.GlobalConstants;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpSession;


public class CurrentSession {
    public static HttpSession session() {
        ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
        return attr.getRequest().getSession(false);
    }

    public static IdmUser getCurrentUser(){
        ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();

        return (IdmUser)attr.getRequest().getSession(false).getAttribute(GlobalConstants.CURRENT_USER);
    }

    public static String getCurrentUserID(){
        ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();

        return ((IdmUser)attr.getRequest().getSession(false).getAttribute(GlobalConstants.CURRENT_USER)).getId();
    }
}

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