建议条件方面组件始终执行

Question

我想根据从属性文件读取的值有条件地创建一个方面。 （它与分析有关，这就是为什么要选择性使用）。

我尝试创建一个实现 Condition 的类，因此使用 matches() 方法，该方法允许我执行必要的验证并将输出设置为相应的布尔值，从而启用或禁用它。

@Aspect
@Component
@Conditional(AuthFilterCondition.class)
public class AuthTokenFilter {

    @Before("@annotation(org.company.annotations.ValidateAuthToken)")
    public void doBefore(JoinPoint joinPoint) {
        System.out.println("Loading auth token filter");

    }
}

验证过滤条件

public class AuthFilterCondition implements Condition {

    private static final String IS_AUTH_FILTER_FEATURE_ENABLED = "org.company.load.auth.filter";

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return (context.getEnvironment().getProperty(IS_AUTH_FILTER_FEATURE_ENABLED).equalsIgnoreCase("true"));
    }
}

控制器

@Path("/v1")
@Produces({ MediaType.APPLICATION_JSON })
@Consumes({ MediaType.APPLICATION_JSON })
public interface HealthService {

    @GET
    @Path("/check/health")
    Response checkHealth();
}

服务实现

public class HealthServiceImpl implements HealthService {

    @ValidateAuthToken
    @Override
    public Response checkHealth() {
        return Response.ok().build();
    }
}

服务器上下文.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
        http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <context:component-scan
            base-package="org.company" />
    <import resource="classpath:/META-INF/cxf/cxf.xml" />
    <import resource="classpath:/META-INF/cxf/cxf-servlet.xml" />
    <import
        resource="classpath*:META-INF/rcp/soa-interceptor-context.xml" />
    <bean id="healthService"
          class="org.company.services.impl.HealthServiceImpl" />
    <bean class="org.company.services.filter.AuthTokenFilter" lazy-init="true">
   
     <jaxrs:server address="/services">
        <jaxrs:serviceBeans>
            <ref bean="healthService" />
        </jaxrs:serviceBeans>
    </jaxrs:server>
    <aop:aspectj-autoproxy />
</beans>

我已经在组件扫描期间使用带有组件的方面进行检测，并且如果不匹配则跳过建议，但它仍在执行建议。如果我在这里做错了什么，请提出建议。

在这里，我在运行时传递一个 VM 参数，该参数具有以下值，这将使 AuthFilterCondition 工作。

-Dorg.company.load.auth.filter=true 

Answer 1

像您一样切换到基于注释的 bean 定义可能是最简单的解决方案。但如果您有理由坚持使用 XML，您可以只使用 Spring 配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:aop="http://www.springframework.org/schema/aop"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
    http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

  <beans profile="auth-filter">
    <bean class="org.company.service.filter.AuthTokenFilter" lazy-init="true"/>
  </beans>

  <beans>
    <import resource="classpath:META-INF/cxf/cxf.xml"/>
    <import resource="classpath:META-INF/cxf/cxf-servlet.xml"/>
    <context:component-scan base-package="org.company"/>
    <bean id="helloWorldService" class="org.company.service.impl.HelloWordServiceImpl"/>
    <jaxrs:server id="restContainer" address="/">
      <jaxrs:serviceBeans>
        <ref bean="helloWorldService"/>
      </jaxrs:serviceBeans>
    </jaxrs:server>
    <aop:aspectj-autoproxy proxy-target-class="true"/>
  </beans>

</beans>

请注意

<beans profile="auth-filter">

。

然后，从方面删除

@Component

和

@Conditional

注释：

@Aspect
//@Component
//@Conditional(AuthFilterCondition.class)
public class AuthTokenFilter {
  public static final String ACCESS_TOKEN_HEADER = "accessToken";

  @Before("@annotation(org.company.service.annotation.ValidateAuthToken)")
  public void doBefore(JoinPoint joinPoint) {
    System.out.println("Reaching Aspect");
  }
}

接下来，例如在 Windows 上启动 Tomcat 时，您可以执行以下操作来激活该方面：

xxx> set SPRING_PROFILES_ACTIVE=auth-filter
xxx> "%CATALINA_HOME%\bin\startup.bat"

要停用它，请永远不要设置环境变量或取消设置它（如果已定义）：

xxx> set SPRING_PROFILES_ACTIVE=
xxx> "%CATALINA_HOME%\bin\startup.bat"