Question

我有一个简单的SpringBoot（2.1.4）应用程序，该应用程序使用Interceptor对每个传入请求进行一些检查。拦截器专门创建一个对象，然后（在preHandle()之后）需要在我的RestController中访问该对象。

更具体地说，这是我的拦截器：

public class MyInterceptor extends HandlerInterceptorAdapter {
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception) throws Exception {}

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}

    @Override
    public boolean preHandle(HttpServletRequest requestServlet, HttpServletResponse responseServlet, Object handler) throws Exception {

        X x = new X();
        x.computeCureForCancerAndStoreItInThisInstance();

        return true;
    }
}

我需要在控制器中访问x：

@RestController
@RequestMapping("/")
public class MyController {
    @GetMapping("/")
    @ResponseBody
    public ResponseEntity getCureForCancer() {

        // access object x HERE!

        return new ResponseEntity<String>("ok", HttpStatus.OK);
    }
}

我现在的问题是：我如何在控制器中访问X的上述实例？

Answer 1

您可以在拦截器中使用ServletRequest#setAttribute：

public class MyInterceptor extends HandlerInterceptorAdapter {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    // create x
    request.setAttribute("com.acme.x", x);
    return true;
  }
}

以及Controller中相应的@RequestAttribute：

public ResponseEntity myHandler(@RequestAttribute("com.acme.x") X x)

春季启动：在RestController中访问拦截器的数据

1 个答案: