springboot版本：2.2.5
一、filter注冊(cè)
springboot中添加filter有兩種方式：
1、實(shí)現(xiàn)方法一
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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(shí)現(xiàn)filter的方式一： * 實(shí)現(xiàn)Filter接口，并使用@Component注解 * 需要注意的是：這個(gè)方式注冊(cè)的filter的執(zhí)行順序優(yōu)先級(jí)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(shí)現(xiàn)方法二
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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); }} |
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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(cè)filter方法二： * 同樣要實(shí)現(xiàn)filter接口，但filter注冊(cè)使用@Bean的方式進(jìn)行注冊(cè)，可以設(shè)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(guò)濾規(guī)則 registrationBean.setUrlPatterns(urls); registrationBean.setOrder(3); return registrationBean; }} |
二、Springboot自帶filter
Springboot默認(rèn)啟用了三個(gè)filter，他們是requestContextFilter，characterEncodingFilter，formContentFilter，可以通過(guò)在application.yml中設(shè)置debug: true來(lái)驗(yàn)證如下：
2020-03-17 22:13:17.254 DEBUG 2700 --- [ main] o.s.b.w.s.f.OrderedRequestContextFilter : Filter 'requestContextFilter' configured for use
2020-03-17 22:13:17.255 DEBUG 2700 --- [ main] s.b.w.s.f.OrderedCharacterEncodingFilter : Filter 'characterEncodingFilter' configured for use
2020-03-17 22:13:17.255 DEBUG 2700 --- [ main] o.s.b.w.s.f.OrderedFormContentFilter : Filter 'formContentFilter' configured for use
三、查看應(yīng)用中注冊(cè)了哪些filter
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#application.ymldebug: true |
如上圖，啟用debug模式，查看日志可得：
標(biāo)藍(lán)部分詳細(xì)內(nèi)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(yīng)用注冊(cè)了五個(gè)filter，執(zhí)行順序由order決定
到此這篇關(guān)于SpringBoot注冊(cè)Filter的兩種實(shí)現(xiàn)方式的文章就介紹到這了,更多相關(guān)SpringBoot注冊(cè)Filter內(nèi)容請(qǐng)搜索服務(wù)器之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持服務(wù)器之家！
原文鏈接：https://segmentfault.com/a/1190000023501017
