在spring中获得request

Posted on 2022-05-04 In 框架 Views:

在spring中获得request，常用的有三种

一.Controller中加参数

@Controller
public class TestController {
    @RequestMapping("/test")
    public void test(HttpServletRequest request) throws InterruptedException {
        // 模拟程序执行了一段时间
        Thread.sleep(1000);
    }
}

线程安全

二.自动注入

@Controller
public class TestController{
     
    @Autowired
    private HttpServletRequest request; //自动注入request
     
    @RequestMapping("/test")
    public void test() throws InterruptedException{
        //模拟程序执行了一段时间
        Thread.sleep(1000);
    }
}

线程安全

在这里可能会有些疑问，spring注入的都是单例，会不会出现问题？不会

@Autowired HttpServletRequest and passing as a parameter are the same things.

Before passing HttpServletRequest to invocation method responding to @RequestMapping function, Spring stores the HttpServletRequest into a ThreadLocal type variable.

That ThreadLocal variable is a thread-safe map that keeps HttpServletRequest in the current thread context. The @Autowired HttpServletRequest proxy bean gets the correct request from that ThreadLocal variable.

三.手动调用

@Controller
public class TestController {
    @RequestMapping("/test")
    public void test() throws InterruptedException {
        HttpServletRequest request = ((ServletRequestAttributes)(RequestContextHolder.currentRequestAttributes())).getRequest();
        // 模拟程序执行了一段时间
        Thread.sleep(1000);
    }
}