思路
在 springboot 里注册过滤器有两种思路，一种是在 configuration 里提供 FilterRegistrationBean 的 bean.
第二种是使用 @WebFilter 注解，并且注意使用 @ServletComponentScan 扫描包，两种方式注册过滤器。
第一种方法
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| public class LogCostFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
long start = System.currentTimeMillis();
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("Execute cost="+(System.currentTimeMillis()-start));
}
@Override
public void destroy() {
}
}
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| @Configuration
public class FilterConfig {
@Bean
public FilterRegistrationBean registFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new LogCostFilter());
registration.addUrlPatterns("/*");
registration.setName("LogCostFilter");
registration.setOrder(1);
return registration;
}
}
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第二种方法
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| @WebFilter(urlPatterns = "/*", filterName = "logFilter2")
public class LogCostFilter2 implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
long start = System.currentTimeMillis();
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("LogFilter2 Execute cost=" + (System.currentTimeMillis() - start));
}
@Override
public void destroy() {
}
}
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这里直接用@WebFilter就可以进行配置，同样，可以设置url匹配模式，过滤器名称等。这里需要注意一点的是@WebFilter这个注解是Servlet3.0的规范，并不是Spring boot提供的。除了这个注解以外，我们还需在配置类中加另外一个注解：@ServletComponetScan，指定扫描的包。
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| @SpringBootApplication
@MapperScan("com.pandy.blog.dao")
@ServletComponentScan("com.pandy.blog.filters")
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
|
参考链接
https://www.cnblogs.com/paddix/p/8365558.html
