将HttpServletResponse注入服务层的最佳方法 [英] Best way to inject HttpServletResponse into service layer

问题描述

我知道这可能不是这类问题的最佳设计，只是针对特定要求。

I know it may not be a best design for a question like this but just for specific requirement.

当前应用程序需要 ServletContext ， HttpServletRequest ， HttpServletResponse 进入自定义身份验证提供程序的服务层。

Current application needs ServletContext, HttpServletRequest, HttpServletResponse in to service layer for a customized authentication provider.

以下代码显然没有任何特定配置或继承：

Obviously without any specific configuration or inheritance following code:

@Component("myAuthenticaionProvider")
public class MyAuthenticaionProvider implements AuthenticationUserDetailsService {
    @Autowired private ServletContext context;
    @Autowired private HttpServletRequest request;
    @Autowired private HttpServletResponse response;
        .......
}

必须抛出异常：

nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No matching bean of type [javax.servlet.http.HttpServletResponse] found for dependency:

我能想到的可能的解决方案：

Possible solutions I can think of:

1. 使用过滤器拦截 HttpServletRequest ，但这需要网址格式，否则会拦截所有网址我认为这可能是一个性能问题？

1. Intercept HttpServletRequest with a filter, but that requires an URL pattern, otherwise will intercept all URLs which I think might be a performance concern?

在spring-security中创建一个请求范围bean。 xml或application-context.xml然后注入当前的身份验证提供程序类，使其能够获取 HttpServletRequest 。但是我觉得这里有什么问题，比如如何启动请求范围bean？

Create a request scope bean in spring-security.xml or application-context.xml and then inject into current authentication provider class, to make it capable to get the HttpServletRequest. But I think there is something wrong here, as how to initiate the request scope bean?

然后可能是什么最佳做法？

Then what could be the best practice?

推荐答案

除了作为一个坏主意之外，请求对象只能在请求时生效。由于生命周期的不同，您无法将其注入单例。您可以通过方法参数传递它。

Beyond being a "bad idea" a request object only lives as long as the request. You can't inject it into a singleton due to lifecycle differences. You can pass it in via a method parameter.

与您的请求匹配的最接近的解决方案是在catch all过滤器内创建一个ThreadLocal变量并将其设置在那里并注入该过滤器或本地线程委托给您的服务。我强烈建议你避免这种情况。

The closest solution matching your request is to create a ThreadLocal variable inside a catch all filter and set it there and inject that filter or a delegate to the thread local into your service. I highly suggest you avoid that.

这篇关于将HttpServletResponse注入服务层的最佳方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！