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
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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
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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 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、查看應用中注冊了哪些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
到此這篇關于SpringBoot注冊Filter的兩種實現方式的文章就介紹到這了,更多相關SpringBoot注冊Filter內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://segmentfault.com/a/1190000023501017
