java定时器任务中获取request对象 @Scheduled 获取request 对象 quartz中获取request对象

叁歲伎倆 2023-01-19 03:05 9阅读 0赞

##                         java定时器任务中获取request对象 @Scheduled 获取request 对象 quartz中获取request对象 ##

**一、问题描述**

1、在java定时任务中，使用 @Scheduled 注解来实现；遇到一个需要通过 request 对象获取相对路径的问题，尝试过过 **静态获取** 和 使用 [直接注入HttpServletRequest对象][HttpServletRequest] 的办法，都没有解决问题，会导致抛出异常如下：

ERROR [org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler] 
     - Unexpected error occurred in scheduled task.

2、使用 @Autowired 注入 HttpServletRequest ，会抛出如下异常：

ava.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    	at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
    	at org.springframework.web.context.support.WebApplicationContextUtils.currentRequestAttributes(WebApplicationContextUtils.java:273)

**二、问题解决**

1、通过 ContextLoader 获取 getCurrentWebApplicationContext 方法解决

WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
     ServletContext servletContext = webApplicationContext.getServletContext();
     String realPath = servletContext.getRealPath(File.separator);

（ **org.springframework.web.context.ContextLoader** ）

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[HttpServletRequest]: https://jingyan.baidu.com/article/a24b33cd487e9f58fe002bb5.html