Java子线程调用RequestContextHolder.getRequestAttributes()方法问题详解

package com.shinedata.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface RequestInheritableThread {
}

package com.shinedata.aop;
import com.shinedata.util.context.RequestHolder;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.ServletRequestAttributes;
@Aspect
@Component
public class RequestHolderAspect {
    @Before("@annotation(com.shinedata.annotation.RequestInheritableThread)")
    public void doBefore(JoinPoint joinPoint) {
        ServletRequestAttributes servletRequestAttributes = RequestHolder.getServletRequestAttributes();
        RequestHolder.setServletRequestAttributes(servletRequestAttributes);
    }
    @After("@annotation(com.shinedata.annotation.RequestInheritableThread)")
    public void doAfter(JoinPoint joinPoint) {
        RequestHolder.removeServletRequestAttributes();
    }
}

package com.shinedata.util.context;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
/**
 * @ClassName RequestHolder
 * @Author yupanpan
 */
public class RequestHolder {
    private static final Logger logger = LoggerFactory.getLogger(RequestHolder.class);
    public static final String GET = "GET";
    public static final String POST = "POST";
    public static final String UTF8 = "UTF-8";
    public static InheritableThreadLocal<ServletRequestAttributes> servletRequestAttributesInheritableThreadLocal= new InheritableThreadLocal();
    public static HttpServletRequest getRequest() {
        return getServletRequestAttributes().getRequest();
    }
    public static HttpServletResponse getResponse() {
        return getServletRequestAttributes().getResponse();
    }
    public static ServletRequestAttributes setServletRequestAttributes(ServletRequestAttributes servletRequestAttributes) {
        servletRequestAttributesInheritableThreadLocal.set(servletRequestAttributes);
        return servletRequestAttributes;
    }
    public static void removeServletRequestAttributes() {
        servletRequestAttributesInheritableThreadLocal.remove();
    }
    public static ServletRequestAttributes getServletRequestAttributes() {
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
        if(requestAttributes==null){
            requestAttributes=servletRequestAttributesInheritableThreadLocal.get();
        }
        return requestAttributes;
    }
}

//开启新线程之前，添加代码：
ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
RequestContextHolder.setRequestAttributes(sra, true);