SpringUtils工具类获取bean

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import java.util.Locale;

@Component
public class SpringUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public static  T getBean(Class tClass){
        return applicationContext.getBean(tClass);
    }

    public static  T getBean(String name, Class type) {
        return applicationContext.getBean(name, type);
    }

    public static HttpServletRequest getCurrentReq() {
        ServletRequestAttributes requestAttrs = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (requestAttrs == null) {
            return null;
        }
        return requestAttrs.getRequest();
    }

    public static String getMessage(String code, Object... args) {
        LocaleResolver localeResolver = getBean(LocaleResolver.class);
        Locale locale = localeResolver.resolveLocale(getCurrentReq());
        return applicationContext.getMessage(code, args, locale);
    }

}

       set赋值时可以先判断下if (SpringUtils.applicationContext == null) {             SpringUtils.applicationContext = applicationContext;         }