Spring MVC 中整数（最终类）的 CGLib 代理

发布于 2024-10-18 04:31:17 字数 928 浏览 5 评论 0原文

我需要这样的用法：

对于每个请求，我想将 userId 注入 DemoController 但由于是一个没有空构造函数的最终类，我无法注入它。在这种情况下，最佳做法是什么？具有请求范围的服务可以吗？

@Configuration
public class CityFactory{

   @Bean(name = {"currentUserId")
   @Scope(value = WebApplicationContext.SCOPE_REQUEST,proxyMode = ScopedProxyMode.TARGET_CLASS)
   @Autowired
   public Integer getUserId(HttpServletRequest request) {
       return UserUtil.getCurrentUserId(request.getServerName());
   }
}


@RequestMapping("/demo")
@Controller
public class DemoController {

    @Autowired
    Ingeter userId;

    @RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
    public ModelAndView helloWorld(@PathVariable("name") String name, Model model) {
        Map<String, Object> myModel = new HashMap<String, Object>();
        model.addAttribute("user", userId);
        return new ModelAndView("v3/test", "m", model);
    }
}

原文

I need such a usage:

For each request I want to inject userId into DemoController But because of being a final class without empty constructor I can not inject it. What is the best practice in such cases? A service with request scope is fine?

@Configuration
public class CityFactory{

   @Bean(name = {"currentUserId")
   @Scope(value = WebApplicationContext.SCOPE_REQUEST,proxyMode = ScopedProxyMode.TARGET_CLASS)
   @Autowired
   public Integer getUserId(HttpServletRequest request) {
       return UserUtil.getCurrentUserId(request.getServerName());
   }
}


@RequestMapping("/demo")
@Controller
public class DemoController {

    @Autowired
    Ingeter userId;

    @RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
    public ModelAndView helloWorld(@PathVariable("name") String name, Model model) {
        Map<String, Object> myModel = new HashMap<String, Object>();
        model.addAttribute("user", userId);
        return new ModelAndView("v3/test", "m", model);
    }
}

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樱花细雨 2024-10-25 04:31:20

最好的选择是创建一个名为 UserId 的显式类，该类又包含一个整数。这不仅可以更好地配合 CGLIB 的代理，而且还可以澄清您的设计。

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一指流沙 2024-10-25 04:31:20

您可以使用供应商或提供商

@Configuration
public class CityFactory{

   @Bean
   @Autowired
   public Supplier<Integer> getUserId(HttpServletRequest request) {
       return () -> UserUtil.getCurrentUserId(request.getServerName());
   }
}
@RequestMapping("/demo")
@Controller
public class DemoController {

    @Autowired
    Supplier<Ingeter> getUserId;

You can use Supplier or Provider

@Configuration
public class CityFactory{

   @Bean
   @Autowired
   public Supplier<Integer> getUserId(HttpServletRequest request) {
       return () -> UserUtil.getCurrentUserId(request.getServerName());
   }
}
@RequestMapping("/demo")
@Controller
public class DemoController {

    @Autowired
    Supplier<Ingeter> getUserId;

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