SpringMVCUtil工具类

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lvym.exception.NotWebContextException;
import com.lvym.exception.SaSpringBootErrorCode;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;



/**
 * SpringMVC 相关操作工具类，快速获取当前会话的 HttpServletRequest、HttpServletResponse 对象
 */
public class SpringMVCUtil {
    
    private SpringMVCUtil() {
    }
    
    /**
     * 获取当前会话的 request 对象
     * @return request
     */
    public static HttpServletRequest getRequest() {
       ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
       if(servletRequestAttributes == null) {
          throw new NotWebContextException("非 web 上下文无法获取 HttpServletRequest").setCode(SaSpringBootErrorCode.CODE_20101);
       }
       return servletRequestAttributes.getRequest();
    }
    
    /**
     * 获取当前会话的 response 对象
     * @return response
     */
    public static HttpServletResponse getResponse() {
       ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
       if(servletRequestAttributes == null) {
          throw new NotWebContextException("非 web 上下文无法获取 HttpServletResponse").setCode(SaSpringBootErrorCode.CODE_20101);
       }
       return servletRequestAttributes.getResponse();
    }

    /**
     * 判断当前是否处于 Web 上下文中  
     * @return /
     */
    public static boolean isWeb() {
       return RequestContextHolder.getRequestAttributes() != null;
    }
    
}