[TOC] # 簡介 springboot內置一些Filter,比如編碼的OrderedCharacterEncodingFilter和請求轉化的HiddenHttpMethodFilter 2種實現,第一種使用@WebFilter,第二種使用FilterRegistrationBean. 第一種定義的優先級不生效,用第二種 自定義Filter步驟 * 實現Filter接口,實現其中的doFilter方法 * 添加@Configuration注解,將自定義Filter加入過濾鏈 ~~~ import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import java.io.IOException; public class MyFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void destroy() { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; System.out.println("this is MyFilter, url: " + request.getRequestURI()); filterChain.doFilter(servletRequest, servletResponse); } } ~~~ ~~~ import com.example.demo.filter.MyFilter; import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class WebConfiguration { @Bean public FilterRegistrationBean testFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setFilter(new MyFilter()); registration.addUrlPatterns("/*"); registration.setName("MyFilter"); registration.setOrder(6); return registration; } } ~~~