在springboot添加過濾器有兩種方式：

1、通過創建FilterRegistrationBean的方式（建議使用此種方式，統一管理，且通過注解的方式若不是本地調試，如果在filter中需要增加cookie可能會存在寫不進前端情況）

2、通過注解@WebFilter的方式

通過創建FilterRegistrationBean的方式創建多個filter以及設置執行順序：

1、創建兩個實現Filter接口的類TestFilter1 、TestFilter2

package com.aoxun.core.filter;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;public class TestFilter1 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException {} @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { chain.doFilter(request, response); } @Override public void destroy() {}}

package com.aoxun.core.filter;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;public class TestFilter2 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException {} @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { chain.doFilter(request, response); } @Override public void destroy() {}}

2、創建配置類

有多個filter就創建多個FilterRegistrationBean ，若需注明filter的執行順序，可通過registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE - 1)配置，值越大，執行順序越靠后

package com.aoxun.config.web;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import com.aoxun.core.filter.TestFilter1;import com.aoxun.core.filter.TestFilter2;/** * filter配置 * @author zcj * */@Configurationpublic class FilterConfig2 { @Bean public FilterRegistrationBean companyUrlFilterRegister() { FilterRegistrationBean registration = new FilterRegistrationBean(); //注入過濾器 registration.setFilter(new TestFilter1()); //攔截規則 registration.addUrlPatterns('/*'); //過濾器名稱 registration.setName('testFilter1'); //過濾器順序 registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE); return registration; } @Bean public FilterRegistrationBean outLinkSecurityFilterRegister() { FilterRegistrationBean registration = new FilterRegistrationBean(); //注入過濾器 registration.setFilter(new TestFilter2()); //攔截規則 registration.addUrlPatterns('/*'); //過濾器名稱 registration.setName('testFilter2'); //過濾器順序 registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE - 1); return registration; } }

通過注解@WebFilter的方式

1、在啟動類上增加@ServletComponentScan注解，自動掃描帶有過濾器注解的包

2、在類上使用@WebFilter

package com.aoxun.core.filter;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 javax.servlet.annotation.WebFilter;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.core.annotation.Order;@WebFilter(filterName='testFilter1',urlPatterns= {'/*'})public class TestFilter1 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { chain.doFilter(request, response); } @Override public void destroy() { // TODO Auto-generated method stub }}

注：經測試，@Order并不能實現過濾器排序功能，在springboot中注解的方式增加過濾器可通過修改過濾器文件名稱的方式排序，如上的過濾器TestFilter1在TestFilter2前。

補充知識：SpringBoot2.1.x，集成Filter過濾器的三種方式，包含OncePerRequestFilter方式

一）Filter過濾器簡介

主要作用：Filter使用戶可以改變一個request和修改一個response，它能夠在一個request到達servlet之前預處理request，也可以在response離開servlet時處理response。例如收集數據和包裝數據，并進行處理。

1、Filter是依賴Servlet容器的，如Tomcat。

2、Filter對所有的請求起作用，并是在sevlet之前處理。可以理解成過濾器中包含攔截器，當一個請求過來，先進行過濾器處理，再看程序是否受理該請求。過濾器執行完后，程序中的攔截器再進行處理。

3、Filter只能處理HttpServletRequest和HttpServletResponse，底層是基于回調函數。

二）SpringBoot集成Filter過濾器

第一步：先創建一個maven項目，引入springboot的jar

<project xmlns='http://maven.apache.org/POM/4.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'> <modelVersion>4.0.0</modelVersion> <groupId>com.oysept</groupId> <artifactId>springboot_filter</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.4.RELEASE</version> <relativePath/> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>com.oysept.FilterApplication</mainClass> </configuration> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> </plugin> </plugins> </build></project>

添加一個application.yml配置文件，指定一個端口

server:

port: 8080

創建一個Demo測試接口

package com.oysept.controller; import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController; /** * Demo Controller * @author ouyangjun */@RestControllerpublic class DemoController { // 帶參GET請求: http://localhost:8080/demo/get/param?param=111222333444 @RequestMapping(value = '/demo/get/param', method = RequestMethod.GET) public String getParam(@RequestParam(value = 'param') String param) { System.out.println('=====>進入DemoController /demo/get/param'); return '/demo/get/param,' + param; }}

第二步：使用@WebFilter注解方式，實現Filter過濾器

當使用@WebFilter、@WebServlet、@WebListener等注解時, 需要在springboot啟動類中啟用@ServletComponentScan注解指定掃描包。

package com.oysept.filter; import java.io.IOException;import java.util.Enumeration; import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.springframework.core.env.Environment;import org.springframework.web.filter.OncePerRequestFilter; /** * 過濾器, 過濾所有地址 * 方式一: 使用@WebFilter、@WebServlet、@WebListener等注解時, 需要在springboot啟動類中啟用@ServletComponentScan注解指定掃描包 * 方式二: 結合@WebFilter和@Component注解一起使用, 但可能會同時注入兩個bean, 可能會報錯, 可在application.yml配置中啟用同名Bean覆蓋: spring.main.allow-bean-definition-overriding=true * @author ouyangjun */@WebFilter(value = '/*', filterName = 'oauthFilter')public class OAuthFilter extends OncePerRequestFilter { @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { System.out.println('====>進入OAuthFilter doFilterInternal過濾器===='); System.out.println('請求地址: ' + request.getRequestURL()); System.out.println('GET請求參數: '); Enumeration<String> parameters = request.getParameterNames(); String parameterName = ''; while (parameters.hasMoreElements()) { parameterName = parameters.nextElement(); System.out.println('參數名稱: ' + parameterName + ', 值: ' + request.getParameter(parameterName)); } // 工具類 //FilterConfig filterConfig = super.getFilterConfig(); //ServletContext servletContext = super.getServletContext(); //Environment environment = super.getEnvironment(); System.out.println('====>結束OAuthFilter doFilterInternal過濾器===='); filterChain.doFilter(request, response); }}

第三步：使用@Component注解方式，實現Filter過濾器

package com.oysept.filter; import java.io.IOException; import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Component; /** * 過濾器通過@Component注解注冊 * @author ouyangjun */@Componentpublic class PathFilter implements Filter { @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { // 轉換 HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; System.out.println('====>進入PathFilter doFilter過濾器===='); System.out.println('====>結束PathFilter doFilter過濾器===='); filterChain.doFilter(request, response); }}

第四步：通過@Bean注解方式，實現Filter過濾器

@Configuration注解：相當于spring中的<beans>標簽

@Bean注解：相當于spring中<bean>標簽

package com.oysept.config; import java.io.IOException; import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; /** * @Configuration注解: 相當于spring中的<beans>標簽 * @Bean注解: 相當于spring中<bean>標簽 * @author ouyangjun */@Configurationpublic class MyFilterConfig { @Bean public FilterRegistrationBean<MyFilter> testFilterRegistration() { FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>(); registration.setFilter(new MyFilter()); registration.addUrlPatterns('/*'); // 配置過濾路徑 registration.addInitParameter('paramName', 'paramValue'); // 添加初始值 registration.setName('myFilter'); // 設置filter名稱 registration.setOrder(1); // 請求中過濾器執行的先后順序，值越小越先執行 return registration; } // 實現一個過濾器 public class MyFilter implements Filter { @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { // 轉換 HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; System.out.println('====>進入MyFilter doFilter過濾器===='); System.out.println('====>結束MyFilter doFilter過濾器===='); filterChain.doFilter(request, response); } }}

第五步：創建一個SpringBoot啟動類，并通過@ServletComponentScan注解指定掃描的Filter實現類

package com.oysept; import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.web.servlet.ServletComponentScan; /** * @ServletComponentScan注解不指定掃描包時, 默認掃描當前包和子包 * @author ouyangjun */@SpringBootApplication@ServletComponentScan(basePackages = 'com.oysept.filter')public class FilterApplication { public static void main(String[] args) { new SpringApplicationBuilder(FilterApplication.class).run(args); }}

啟動main方法，在瀏覽器輸入地址：http://localhost:8080/demo/get/param?param=111222333444

在控制臺查看打印日志：

項目結構圖：

以上這篇解決springboot中配置過濾器以及可能出現的問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。