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

import lombok.extern.slf4j.Slf4j;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebFilter;import java.io.IOException;@WebFilter(urlPatterns = '/*')@Slf4jpublic class WebFilterTest implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { log.info('WebFilterTest --- init'); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { log.info('WebFilterTest --- doFilter'); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { log.info('WebFilterTest --- destroy'); }}

@WebFilter源码:

@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface WebFilter { String description() default ''; /**Filter显示名*/ String displayName() default ''; /**配置参数*/ WebInitParam[] initParams() default {}; /**Filter名称*/ String filterName() default ''; String smallIcon() default ''; String largeIcon() 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*/ boolean asyncSupported() default false;}

在springBoot的启动类中加入注解:

import org.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

import org.springframework.core.annotation.Order;@WebFilter(urlPatterns = '/*')@Slf4j@Order(1)public class WebFilterTest implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { log.info('WebFilterTest --- init'); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { log.info('WebFilterTest --- doFilter'); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { log.info('WebFilterTest --- destroy'); }}

@WebFilter(urlPatterns = '/*')@Slf4j@Order(2)public class WebFilterTest2 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { log.info('2---WebFilterTest2 --- init'); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { log.info('2 --- WebFilterTest2 --- doFilter'); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { log.info('WebFilterTest2 --- destroy'); }}

执行结果

WebFilterTest --- doFilter2 --- WebFilterTest2 --- doFilter

不使用注解的方式使用过滤器

创建过滤器类

public class WebFilterTest implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { log.info('WebFilterTest --- init'); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { log.info('WebFilterTest --- doFilter'); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { log.info('WebFilterTest --- destroy'); }}

注册过滤器

@Configurationpublic class FilterConfig { @Bean public WebFilterTest webFilterTest(){ return new WebFilterTest(); } @Bean public FilterRegistrationBean filterRegist(){ FilterRegistrationBean frBean = new FilterRegistrationBean(); frBean.setFilter(webFilterTest()); frBean.setOrder(1); frBean.addUrlPatterns('/*'); return frBean; }}

多个过滤器注册

再添加一个过滤器:

@Slf4jpublic class WebFilterTest2 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { log.info('2---WebFilterTest2 --- init'); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { log.info('2 --- WebFilterTest2 --- doFilter'); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { log.info('WebFilterTest2 --- destroy'); }}

修改配置类:

@Configurationpublic class FilterConfig { @Bean public WebFilterTest webFilterTest(){ return new WebFilterTest(); } @Bean public WebFilterTest2 webFilterTest2(){ return new WebFilterTest2(); } @Bean public FilterRegistrationBean filterRegist(){ FilterRegistrationBean frBean = new FilterRegistrationBean(); frBean.setFilter(webFilterTest()); frBean.setOrder(1); frBean.addUrlPatterns('/*'); return frBean; } @Bean public FilterRegistrationBean filterRegist2(){ FilterRegistrationBean frBean = new FilterRegistrationBean(); frBean.setFilter(webFilterTest2()); frBean.setOrder(2); frBean.addUrlPatterns('/*'); return frBean; }}

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