java多线程实战一：子线程http请求上下文注入

共享主线程和子线程之间请求上下文，包括主线程请求参数、变量等。慎用，一定要测试，子线程中有些代码可能报错，可以提取变量到主线程。

```java
ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

RequestContextHolder.setRequestAttributes(servletRequestAttributes, true);

ExecutorService executorService = Executors.newFixedThreadPool(5);

ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
RequestContextHolder.setRequestAttributes(servletRequestAttributes, true);

for (int i = 0; i < data.size(); i++) {
    int finalI = i;
    executorService.execute(new Runnable() {
        @Override
        public void run() {
            // 做你想做的
           xxxxxxxxxxxxxxxxx
           xxxxxxxxxxxxxxx
            }
        }
    });
}

executorService.shutdown(); //关闭线程
// 阻塞主线程, 直至线程池关闭
executorService.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);