springboot @WebFilter注解過濾器的實現

@WebFilter注解過濾器

@WebFilter加在過濾器的注解上使用

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源碼:

@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface WebFilter { String description() default ''; /**Filter顯示名*/ String displayName() default ''; /**配置參數*/ WebInitParam[] initParams() default {}; /**Filter名稱*/ String filterName() default ''; String smallIcon() default ''; String largeIcon() default ''; /**指定對哪些Servlet進行過濾*/ String[] servletNames() default {}; /**指定攔截的路徑*/ String[] value() default {}; /**指定攔截的路徑*/ String[] urlPatterns() default {}; /**指定Filter對哪種方式的請求進行過濾*/ DispatcherType[] dispatcherTypes() default {DispatcherType.REQUEST}; /**指定Filter是否支持異步模式*/ boolean asyncSupported() default false;}

在springBoot的啟動類中加入注解:

import org.springframework.boot.web.servlet.ServletComponentScan;@ServletComponentScan

多個@WebFilter注解的過濾器可以配合@Order()注解實現執行過濾的順序

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'); }}

執行結果

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

不使用注解的方式使用過濾器

創建過濾器類

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'); }}

注冊過濾器

@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; }}

多個過濾器注冊

再添加一個過濾器:

@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'); }}

修改配置類:

@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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