CDI注入点@httpparam问题

发布于 2024-09-17 07:11:40 字数 812 浏览 5 评论 0原文

有一个非常有趣的示例，介绍如何使用 CDI 获取 http 参数，

但我将代码复制粘贴到 netbeans 中，所有内容都可以编译，但出现部署错误

原因为：org.jboss.weld.exceptions.DeploymentException：WELD -001408 注入点具有不满足的依赖性。注入点：java.lang.String com.test.HttpParamProducer.getParamValue(javax.enterprise.inject.spi.InjectionPoint,javax.servlet.ServletRequest)的参数1;限定符：[@javax.enterprise.inject.Default()]

如何解决这个问题？？？

public class HttpParamProducer {

   @HttpParam("")
   @Produces
   String getParamValue(
           InjectionPoint ip, ServletRequest request) {

      return request.getParameter(ip.getAnnotated().getAnnotation(HttpParam.class).value());

   }
}

原文

I follow the Weld's doc

in the section 4.11. The InjectionPoint object

There is a very interesting example about how to obtain the http parameter using CDI

but i copy-pasted the code into netbeans, everything compiles, but has an deployment error

Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001408 Injection point has unsatisfied dependencies. Injection point: parameter 1 of java.lang.String com.test.HttpParamProducer.getParamValue(javax.enterprise.inject.spi.InjectionPoint,javax.servlet.ServletRequest); Qualifiers: [@javax.enterprise.inject.Default()]

how to solve this problem???

public class HttpParamProducer {

   @HttpParam("")
   @Produces
   String getParamValue(
           InjectionPoint ip, ServletRequest request) {

      return request.getParameter(ip.getAnnotated().getAnnotation(HttpParam.class).value());

   }
}

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神仙妹妹 2024-09-24 07:11:40

生产者方法上的每个参数都会被注入，并且您的任何 Bean（包括生产者）都不会提供 API 类型 ServletRequest 来满足此注入点。

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溺渁∝ 2024-09-24 07:11:40

似乎两年后，这个问题仍然令人感兴趣

，这是 CDI 规范的一个缺点，它不需要容器将 HttpServletRequest 作为可注入 bean 公开，

这里是一个合理的解决方法

@WebListener 
public class HttpServletRequestProducer implements ServletRequestListener {
    private final static ThreadLocal<HttpServletRequest> holder = new ThreadLocal<HttpServletRequest>();

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        holder.remove();
    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        holder.set((HttpServletRequest)sre.getServletRequest());
    }

    @Produces @RequestScoped HttpServletRequest get() {
        return holder.get();
    }
}

，现在 @Inject HttpServletRequest 将工作为期待

快乐的编码

it seems that after two years, this question is still interested

this is a short coming of the CDI spec, where it doesn't require the container to expose HttpServletRequest as injectable bean

here is a reasonable work around

@WebListener 
public class HttpServletRequestProducer implements ServletRequestListener {
    private final static ThreadLocal<HttpServletRequest> holder = new ThreadLocal<HttpServletRequest>();

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        holder.remove();
    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        holder.set((HttpServletRequest)sre.getServletRequest());
    }

    @Produces @RequestScoped HttpServletRequest get() {
        return holder.get();
    }
}

now @Inject HttpServletRequest will be working as expected

happy coding

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