springboot @WebFilter注解过滤器的实现
@WebFilter注解过滤器
@WebFilter加在过滤器的注解上使用
importlombok.extern.slf4j.Slf4j; importjavax.servlet.Filter; importjavax.servlet.FilterChain; importjavax.servlet.FilterConfig; importjavax.servlet.ServletException; importjavax.servlet.ServletRequest; importjavax.servlet.ServletResponse; importjavax.servlet.annotation.WebFilter; importjava.io.IOException; @WebFilter(urlPatterns="/*") @Slf4j publicclassWebFilterTestimplementsFilter{ @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ log.info("WebFilterTest---init"); } @Override publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{ log.info("WebFilterTest---doFilter"); filterChain.doFilter(servletRequest,servletResponse); } @Override publicvoiddestroy(){ log.info("WebFilterTest---destroy"); } }
@WebFilter源码:
@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public@interfaceWebFilter{ Stringdescription()default""; /**Filter显示名*/ StringdisplayName()default""; /**配置参数*/ WebInitParam[]initParams()default{}; /**Filter名称*/ StringfilterName()default""; StringsmallIcon()default""; StringlargeIcon()default""; /**指定对哪些Servlet进行过滤*/ String[]servletNames()default{}; /**指定拦截的路径*/ String[]value()default{}; /**指定拦截的路径*/ String[]urlPatterns()default{}; /**指定Filter对哪种方式的请求进行过滤*/ DispatcherType[]dispatcherTypes()default{DispatcherType.REQUEST}; /**指定Filter是否支持异步模式*/ booleanasyncSupported()defaultfalse; }
在springBoot的启动类中加入注解:
importorg.springframework.boot.web.servlet.ServletComponentScan; @ServletComponentScan
多个@WebFilter注解的过滤器可以配合@Order()注解实现执行过滤的顺序
importorg.springframework.core.annotation.Order; @WebFilter(urlPatterns="/*") @Slf4j @Order(1) publicclassWebFilterTestimplementsFilter{ @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ log.info("WebFilterTest---init"); } @Override publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{ log.info("WebFilterTest---doFilter"); filterChain.doFilter(servletRequest,servletResponse); } @Override publicvoiddestroy(){ log.info("WebFilterTest---destroy"); } }
@WebFilter(urlPatterns="/*") @Slf4j @Order(2) publicclassWebFilterTest2implementsFilter{ @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ log.info("2---WebFilterTest2---init"); } @Override publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{ log.info("2---WebFilterTest2---doFilter"); filterChain.doFilter(servletRequest,servletResponse); } @Override publicvoiddestroy(){ log.info("WebFilterTest2---destroy"); } }
执行结果
WebFilterTest---doFilter
2---WebFilterTest2---doFilter
不使用注解的方式使用过滤器
创建过滤器类
publicclassWebFilterTestimplementsFilter{ @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ log.info("WebFilterTest---init"); } @Override publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{ log.info("WebFilterTest---doFilter"); filterChain.doFilter(servletRequest,servletResponse); } @Override publicvoiddestroy(){ log.info("WebFilterTest---destroy"); } }
注册过滤器
@Configuration publicclassFilterConfig{ @Bean publicWebFilterTestwebFilterTest(){ returnnewWebFilterTest(); } @Bean publicFilterRegistrationBeanfilterRegist(){ FilterRegistrationBeanfrBean=newFilterRegistrationBean(); frBean.setFilter(webFilterTest()); frBean.setOrder(1); frBean.addUrlPatterns("/*"); returnfrBean; } }
多个过滤器注册
再添加一个过滤器:
@Slf4j publicclassWebFilterTest2implementsFilter{ @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ log.info("2---WebFilterTest2---init"); } @Override publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{ log.info("2---WebFilterTest2---doFilter"); filterChain.doFilter(servletRequest,servletResponse); } @Override publicvoiddestroy(){ log.info("WebFilterTest2---destroy"); } }
修改配置类:
@Configuration publicclassFilterConfig{ @Bean publicWebFilterTestwebFilterTest(){ returnnewWebFilterTest(); } @Bean publicWebFilterTest2webFilterTest2(){ returnnewWebFilterTest2(); } @Bean publicFilterRegistrationBeanfilterRegist(){ FilterRegistrationBeanfrBean=newFilterRegistrationBean(); frBean.setFilter(webFilterTest()); frBean.setOrder(1); frBean.addUrlPatterns("/*"); returnfrBean; } @Bean publicFilterRegistrationBeanfilterRegist2(){ FilterRegistrationBeanfrBean=newFilterRegistrationBean(); frBean.setFilter(webFilterTest2()); frBean.setOrder(2); frBean.addUrlPatterns("/*"); returnfrBean; } }
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