Spring Boot使用Filter有两种方式：
方式一，使用FilterRegistrationBean配置
@RestController
@Slf4j
public class FilterDemoController {
@GetMapping("hello")
public String hello(){
log.info("FilterDemoController hello");
return "hello";
}
}
package com.mervyn.filterdemo.filter;
import lombok.extern.slf4j.Slf4j;
import javax.servlet.*;
import java.io.IOException;
@Slf4j
public class FilterOne implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
log.info("FilterOne init");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
log.info("FilterOne doFilter");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
log.info("FilterOne destroy");
}
}
package com.mervyn.filterdemo.filter;
import lombok.extern.slf4j.Slf4j;
import javax.servlet.*;
import java.io.IOException;
@Slf4j
public class FilterTwo implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
log.info("FilterTwo init");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
log.info("FilterTwo doFilter");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
log.info("FilterTwo destroy");
}
}
package com.mervyn.filterdemo.config;
import com.mervyn.filterdemo.filter.FilterOne;
import com.mervyn.filterdemo.filter.FilterTwo;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class FilterConfig {
@Bean
public FilterRegistrationBean registFilterOne() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new FilterOne());
registration.addUrlPatterns("/hello");
registration.setName("FilterOne");
registration.setOrder(1);
return registration;
}
@Bean
public FilterRegistrationBean registFFilterTwo() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new FilterTwo());
registration.addUrlPatterns("/hello");
registration.setName("FilterTwo");
registration.setOrder(2);
return registration;
}
}
server:
port: 80
2020-04-23 12:27:07.699 INFO 15690 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 714 ms
2020-04-23 12:27:07.736 INFO 15690 --- [ main] com.mervyn.filterdemo.filter.FilterOne : FilterOne init
2020-04-23 12:27:07.736 INFO 15690 --- [ main] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo init
2020-04-23 12:27:07.826 INFO 15690 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-04-23 12:27:07.949 INFO 15690 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 80 (http) with context path ''
2020-04-23 12:27:07.952 INFO 15690 --- [ main] c.m.filterdemo.FilterdemoApplication : Started FilterdemoApplication in 16.321 seconds (JVM running for 16.622)
2020-04-23 12:27:27.581 INFO 15690 --- [p-nio-80-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-04-23 12:27:27.582 INFO 15690 --- [p-nio-80-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-04-23 12:27:27.585 INFO 15690 --- [p-nio-80-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 3 ms
2020-04-23 12:27:27.591 INFO 15690 --- [p-nio-80-exec-1] com.mervyn.filterdemo.filter.FilterOne : FilterOne doFilter
2020-04-23 12:27:27.591 INFO 15690 --- [p-nio-80-exec-1] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo doFilter
2020-04-23 12:27:27.602 INFO 15690 --- [p-nio-80-exec-1] c.m.f.controller.FilterDemoController : FilterDemoController hello
2020-04-23 12:27:35.493 INFO 15690 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2020-04-23 12:27:35.505 INFO 15690 --- [extShutdownHook] com.mervyn.filterdemo.filter.FilterOne : FilterOne destroy
2020-04-23 12:27:35.506 INFO 15690 --- [extShutdownHook] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo destroy
方式二，使用@WebFilter注解
package com.mervyn.filterdemo.filter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@Slf4j
@Component
@WebFilter(urlPatterns = "/hello", filterName = "filterOne")
public class FilterOne implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
log.info("FilterOne init");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
log.info("FilterOne doFilter");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
log.info("FilterOne destroy");
}
}
package com.mervyn.filterdemo.filter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@Slf4j
@Component
@WebFilter(urlPatterns = "/hello", filterName = "filterTwo")
public class FilterTwo implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
log.info("FilterTwo init");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
log.info("FilterTwo doFilter");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
log.info("FilterTwo destroy");
}
}
2020-04-23 13:32:20.574 INFO 15767 --- [ main] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo init
2020-04-23 13:32:20.574 INFO 15767 --- [ main] com.mervyn.filterdemo.filter.FilterOne : FilterOne init
2020-04-23 13:32:20.658 INFO 15767 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-04-23 13:32:20.777 INFO 15767 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 80 (http) with context path ''
2020-04-23 13:32:20.780 INFO 15767 --- [ main] c.m.filterdemo.FilterdemoApplication : Started FilterdemoApplication in 16.217 seconds (JVM running for 16.506)
2020-04-23 13:32:50.464 INFO 15767 --- [p-nio-80-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-04-23 13:32:50.465 INFO 15767 --- [p-nio-80-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-04-23 13:32:50.469 INFO 15767 --- [p-nio-80-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 4 ms
2020-04-23 13:32:50.475 INFO 15767 --- [p-nio-80-exec-1] com.mervyn.filterdemo.filter.FilterOne : FilterOne doFilter
2020-04-23 13:32:50.475 INFO 15767 --- [p-nio-80-exec-1] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo doFilter
2020-04-23 13:32:50.487 INFO 15767 --- [p-nio-80-exec-1] c.m.f.controller.FilterDemoController : FilterDemoController hello
2020-04-23 13:32:53.476 INFO 15767 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2020-04-23 13:32:53.490 INFO 15767 --- [extShutdownHook] com.mervyn.filterdemo.filter.FilterTwo : FilterTwo destroy
2020-04-23 13:32:53.490 INFO 15767 --- [extShutdownHook] com.mervyn.filterdemo.filter.FilterOne : FilterOne destroy
这种方式无法指定Filter的顺序。
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