如何实现Spring Boot中使用@WebFilter注解的过滤器？

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java@WebFilterpublic class CustomFilter implements Filter {

@Override public void init(FilterConfig filterConfig) throws ServletException { // Initialization code here }

@Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // Filter logic here }

@Override public void destroy() { // Cleanup code here }}

@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 = "/*") @Slf4j 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源码:

@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public @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 --- doFilter
2 --- 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

@Configuration public 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:

@Slf4j 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"); } }

修改配置类:

@Configuration public 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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