我有一个组件类:
public class FooFilter implements Filter {
private FooService fooService; //spring-injected dependency
@Override public void init(FilterConfig filterConfig) {}
@Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain){}
@Override public void destroy() {}
}
在 springConfigured.xml 中定义:
<context:spring-configured />
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<bean class="com.foo.filter.FooFilter" scope="prototype" autowire="byType"/>
</beans>
过滤器是使用 FilterRegistrationBean 在我们的过滤器链中配置的:
@Configuration
public class FooFilterRegistrationConfig {
private List<String> URL_PATTERNS = Arrays.asList("foo", "bar");
@Bean
public FilterRegistrationBean fooFilter(FooFilter filter) {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(filter);
registration.setName("FooFilter");
registration.setUrlPatterns(URL_PATTERNS);
registration.setOrder(4);
return registration;
}
//and some more
}
使用此设置,我们最终会在过滤器链中得到两个 FooFilter。日志:
//a bunch of filters
2017-10-16 16:34:37,468 [RMI TCP Connection(3)-127.0.0.1] INFO servlet.FilterRegistrationBean - Mapping filter: 'FooFilter' to urls: [*.jsp, *.do, *.faces, *.action, /mvc/*]
//some more filters
2017-10-16 16:34:37,468 [RMI TCP Connection(3)-127.0.0.1] INFO servlet.FilterRegistrationBean - Mapping filter: 'com.foo.web.filter.FooFilter#0' to: [/*]
类似问题的其他一些答案建议使用 RegistrationConfig 禁用过滤器。如果我尝试使用 registration.setEnabled(false)
禁用 FilterRegistrationConfig 中的过滤器,我仍然会在最后得到附加过滤器。
2017-10-16 16:22:46,078 [RMI TCP Connection(3)-127.0.0.1] INFO servlet.FilterRegistrationBean - Filter FooFilter was not registered (disabled)
...
2017-10-16 16:22:46,079 [RMI TCP Connection(3)-127.0.0.1] INFO servlet.FilterRegistrationBean - Mapping filter: 'com.foo.filter.FooFilter#0' to: [/*]
我尝试完全删除 FilterRegistrationConfig
中对此过滤器的引用,并直接在 FooFilter 类上使用 @Order
注释,但因为我们正在指定这个 bean 在我们的 xml 中并且不使用组件扫描,我似乎无法获得 @WebFilter
注释来正确应用 Url 模式。
任何有关如何从我的过滤器链中删除这个 Spring Boot 创建的 FooFilter#0 的提示将不胜感激!
编辑:
我尝试从 xml 中删除 bean 定义。现在我无法将其注入(inject) FilterRegistrationBean 方法,因为这给了我“找不到 'FooFilter' 类型的 beans”错误。
@Bean
public FilterRegistrationBean fooFilter(FooFilter filter) { //no beans of 'FooFilter' type found
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(filter);
registration.setName("FooFilter");
registration.setUrlPatterns(URL_PATTERNS);
registration.setOrder(4);
return registration;
}
但是,如果我在这里手动实例化 FooFilter,稍后会遇到问题,因为 FooFilter 包含许多未注入(inject)的 spring 管理的依赖项:
@Bean
public FilterRegistrationBean fooFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new FooFilter()); //works fine here, but Spring does not inject dependencies into this object I created, so null pointers later
registration.setName("FooFilter");
registration.setUrlPatterns(URL_PATTERNS);
registration.setOrder(4);
return registration;
}
最佳答案
FilterRegistrationBean 创建您的 FooFilter bean,您不必单独创建它,删除 FooFilter 的 bean(以下行)
<bean class="com.foo.filter.FooFilter" scope="prototype" autowire="byType"/>
注意:
当 spring 容器创建 bean FilterRegistrationBean 时,它还会创建一个 bean FooFilter,正如您所提到的。
注册.setName("FooFilter");//FooFilter 是 bean 的名称
关于java - 无法覆盖或禁用 spring boot 实例化的 Filter,导致过滤器链中出现重复条目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46779572/