这篇文章主要介绍了springboot @WebFilter注解过滤器的实现，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
@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,servle<span style="color:transparent">来源gaodai#ma#com搞*!代#%^码网</span>tResponse); } @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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转载请注明原文链接：springboot @WebFilter注解过滤器的实现
转载请注明原文链接：springboot @WebFilter注解过滤器的实现
