我有一个 spring-boot
应用程序。
我的项目中没有 ApplicationContext.xml
或 web.xml
文件。我更喜欢避免它们并在 Java 代码中配置所有内容。
我已阅读以下有关 servlet 过滤器中 Bean 注入(inject)的帖子。
读完它们后,我开始使用DelegatingFilterProxy
。
我的问题是如何将 bean Autowiring 到过滤器中并避免使用 xml
文件,尤其是对于 DelegatingFilterProxy 配置。
截取的代码可以从 github. 中托管的第二篇文章中获取。
public class AuditHandler {
public void auditRequest(String appName, ServletRequest request) {
System.out.println(appName + ": Received request from " + request.getRemoteAddr() );
}
}
public class AuditFilter implements Filter {
private final AuditHandler auditHandler;
private String appName;
public AuditFilter(AuditHandler auditHandler) {
this.auditHandler = auditHandler;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
auditHandler.auditRequest(appName, request);
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException {
appName = filterConfig.getInitParameter("appName");
}
public void destroy() {}
}
ApplicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="auditHandler" class="com.deadcoderising.AuditHandler">
</bean>
<bean id="auditFilter" class="com.deadcoderising.AuditFilter">
<constructor-arg ref="auditHandler"/>
</bean>
</beans>
web.xml
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
metadata-complete="true">
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext*.xml</param-value>
</context-param>
<filter>
<filter-name>auditFilter</filter-name>
<filter-class>
org.springframework.web.filter.DelegatingFilterProxy
</filter-class>
<init-param>
<param-name>targetFilterLifecycle</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>appName</param-name>
<param-value>di-example</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>auditFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
最佳答案
您应该将 FilterRegistrationBean
添加到您的主 Application 类(使用 @SpringBootApplication
注释的类),并让 Spring 提供 AuditHandler
的实例:
@Bean
@Autowired
public FilterRegistrationBean auditFilterRegistration(AuditHandler handler) {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new AuditFilter(handler));
filterRegistrationBean.setOrder(3); // ordering in the filter chain
return filterRegistrationBean;
}
如果这不起作用(例如,您的 AuditHandler
实现未正确注释或不在默认包扫描路径上),您可以指示 Spring 提供它(也在您的 @ SpringBootApplication
注释类):
@Bean
public AuditHandler auditHandler() {
return new AuditHandlerImplementation();
}
关于spring - 如何在 Spring 应用程序的 servlet 过滤器中 Autowiring bean?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32127258/