springboot版本：2.2.5

一、filter注冊

springboot中添加filter有兩種方式：

1、實現方法一

package com.example.demo.filter1;import java.io.IOException;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 org.springframework.stereotype.Component;/** * Springboot實現filter的方式一： * 實現Filter接口，并使用@Component注解 * 需要注意的是：這個方式注冊的filter的執行順序優先級較低 * @author Administrator * */@Componentpublic class FilterSample1 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println('這里是'+this.getClass().getName()+'的init'); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println('這里是'+this.getClass().getName()+'的doFilter'); chain.doFilter(request,response); } @Override public void destroy() { System.out.println('這里是'+this.getClass().getName()+'的doFilter'); }}

2、實現方法二

package com.example.demo.filter2;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class FilterSample2 implements Filter{ @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println('這里是'+this.getClass().getName()+'的doFilter'); chain.doFilter(request,response); }}

package com.example.demo.filter2;import java.util.ArrayList;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;/** * Springboot注冊filter方法二： * 同樣要實現filter接口，但filter注冊使用@Bean的方式進行注冊，可以設置filter順序 * @author Administrator * */@Configurationpublic class WebConfig { @Bean public FilterRegistrationBean<FilterSample2> filterSample2() { FilterRegistrationBean<FilterSample2> registrationBean = new FilterRegistrationBean<FilterSample2>(); FilterSample2 myFilter = new FilterSample2(); registrationBean.setFilter(myFilter); ArrayList<String> urls = new ArrayList<>(); urls.add('/*');//配置過濾規則 registrationBean.setUrlPatterns(urls); registrationBean.setOrder(3); return registrationBean; }}

二、Springboot自帶filter

Springboot默認啟用了三個filter，他們是requestContextFilter，characterEncodingFilter，formContentFilter，可以通過在application.yml中設置debug: true來驗證如下：

2020-03-17 22:13:17.254 DEBUG 2700 --- [ main] o.s.b.w.s.f.OrderedRequestContextFilter : Filter ’requestContextFilter’ configured for use2020-03-17 22:13:17.255 DEBUG 2700 --- [ main] s.b.w.s.f.OrderedCharacterEncodingFilter : Filter ’characterEncodingFilter’ configured for use2020-03-17 22:13:17.255 DEBUG 2700 --- [ main] o.s.b.w.s.f.OrderedFormContentFilter : Filter ’formContentFilter’ configured for use

三、查看應用中注冊了哪些filter

#application.ymldebug: true

如上圖，啟用debug模式，查看日志可得：

標藍部分詳細內容如下：

2020-03-17 22:13:17.244 DEBUG 2700 --- [ main] o.s.b.w.s.ServletContextInitializerBeans : Mapping filters: filterRegistrationBean urls=[/*] order=3, characterEncodingFilter urls=[/*] order=-2147483648, formContentFilter urls=[/*] order=-9900, requestContextFilter urls=[/*] order=-105, filterSample1 urls=[/*] order=2147483647

可以看出，該應用注冊了五個filter，執行順序由order決定

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