SpringBoot无法扫描到@Configuration注解的Filter过滤器

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SpringBoot的优点，就是整合了所有框架，便于快速开发，其他的就不多说了。在SpirngBoot工程中，过滤器Filter是经常使用的，下面先介绍一下过滤器的配置方法。

第一种方法：@WebFilter注解方式

使用@WebFilter注解为声明当前类为filter，第一个参数为该filter起一个名字，第二个参数为说明要拦截的请求地址，当前类需要实现Filter接口，里面有三个方法，分别为过滤器初始化、过滤方法和过滤器销毁。

@WebFilter(filterName = "myFilter1", urlPatterns = "/*")
public class MyFilter1 implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {System.out.println("进入过滤器初始化方法");}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {log.info("myFilter1 begin");try {System.out.println("进入过滤器业务逻辑方法");chain.doFilter(request, response);} catch (Exception e) {log.error("error!", e);}log.info("myFilter1 end");}@Overridepublic void destroy() {System.out.println("进入过滤器销毁方法");}
}

在SpringBoot启动类上加上以下注解

@ServletComponentScan注解，@ServletComponentScan注解所扫描的包路径必须包含该Filter

例如：

@SpringBootApplication
@ServletComponentScan(basePackages = "com.example.demo.filter")
public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}
}

第二种方法：@Bean注解方式

MyFilter.java类，不要加注解@WebFilter，代码如下：

public class MyFilter implements Filter {@Overridepublic void destroy() {// TODO Auto-generated method stub}@Overridepublic void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain filterChain)throws IOException, ServletException {// TODO Auto-generated method stubHttpServletRequest request = (HttpServletRequest) srequest;System.out.println("this is MyFilter,url :"+request.getRequestURI());srequest.setCharacterEncoding("UTF-8");sresponse.setContentType("text/html;chartset=UTF-8");filterChain.doFilter(srequest, sresponse);}@Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}}

新建配置类WebConfiguration.java，配置bean，代码如下：

@Configuration
public class WebConfiguration extends WebMvcConfigurerAdapter{@Beanpublic RemoteIpFilter remoteIpFilter() {return new RemoteIpFilter();}@Beanpublic FilterRegistrationBean testFilterRegistration() {FilterRegistrationBean registration = new FilterRegistrationBean();registration.setFilter( MyFilter());registration.addUrlPatterns("/*");/*registration.addInitParameter("paramName", "paramValue");*/registration.setName("MyFilter");registration.setOrder(1);return registration;}}

然后就可以启动，查看运行效果