SpringBoot--解决子线程无法获得HttpServletRequest的attribute的问题

时间:2025-03-18 07:42:09

原文网址:SpringBoot--解决子线程无法获得HttpServletRequest的attribute的问题_IT利刃出鞘的博客-****博客

简介

        本文介绍解决SpringBoot子线程无法获得HttpServletRequest的attribute的问题。

        在SpringBoot请求中,如果创建了子线程获取request的attribute,会无法获取到。比如:我想记录日志,将日志放到了request的attribute中:("logContent", "日志内容"),然后创建子线程去获取logContent,然后进行处理。

问题复现

代码

package ;

import ;
import ;
import ;
import ;

import ;
import ;

@RestController
public class HelloController {

    @GetMapping("/test")
    public String test() {
        ServletRequestAttributes servletRequestAttributes =
                (ServletRequestAttributes)();
        HttpServletRequest request = ();
        ("logContent", "日志内容:" + ());

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                ServletRequestAttributes servletRequestAttributes =
                        (ServletRequestAttributes)();
                HttpServletRequest request = ();

                ("子线程运行。获取到的attribute为:"
                        + ("logContent"));
            }
        });
        ();

        return "test success";
    }
}

结果(getRequestAttributes返回null)

Exception in thread "Thread-131" 
	at $(:26)
	at (:748)

解决方案

创建子线程之前调用如下代码:

(servletRequestAttributes, true);

代码

package ;

import ;
import ;
import ;
import ;

import ;
import ;

@RestController
public class HelloController {

    @GetMapping("/test")
    public String test() {
        ServletRequestAttributes servletRequestAttributes =
                (ServletRequestAttributes)();
        HttpServletRequest request = ();
        ("logContent", "日志内容:" + ());

        (servletRequestAttributes, true);

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                ServletRequestAttributes servletRequestAttributes =
                        (ServletRequestAttributes)();
                HttpServletRequest request = ();

                ("子线程运行。获取到的attribute为:"
                        + ("logContent"));
            }
        });
        ();

        return "test success";
    }
}

结果(可以获取到属性)

子线程运行。获取到的attribute为:日志内容:2022-09-03T16:43:18.463

线程安全性

        上边的解决方案是否有线程安全问题呢?我在子线程里延时5秒模拟长时间请求,然后多次请求,看结果。如果值都是不一样的话,应该是线程安全的。(本处我无法百分百确定,实际开发中不太建议这么写。实际开发中建议将日志内容作为线程的参数传入,与attribute剥离开)。

代码

package ;

import ;
import ;
import ;
import ;

import ;
import ;

@RestController
public class HelloController {

    @GetMapping("/test")
    public String test() {
        ServletRequestAttributes servletRequestAttributes =
                (ServletRequestAttributes)();
        HttpServletRequest request = ();
        ("logContent", "日志内容:" + ());

        (servletRequestAttributes, true);

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                ServletRequestAttributes servletRequestAttributes =
                        (ServletRequestAttributes)();
                HttpServletRequest request = ();

                ("子线程运行。获取到的attribute为:"
                        + ("logContent"));

                try {
                    (5000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        });
        ();

        return "test success";
    }
}

结果(日志内容是新的,应该是线程安全的)

子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:42.242
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:42.799
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:43.359
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:43.877
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:44.392
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:44.804
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:45.247
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:45.610
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:46.010
子线程运行。获取到的attribute为:日志内容:2022-09-03T16:46:46.433