spring-boot Filter实现

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新建一个简单springboot项目：

<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>

        <!--spring-boot-starter-web 默认使用tomcat容器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

新建LogFilter实现Filter 

package com.example.demo.filter;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.*;
import java.io.IOException;

public class LogFilter implements Filter {

    private Logger logger = LoggerFactory.getLogger(LogFilter.class);

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        logger.info("请求进来了");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        logger.info("容器初始化");
    }

    @Override
    public void destroy() {
        logger.info("容器销毁了");
    }
}

利用FilterRegistrationBean进行包装

package com.example.demo.filter;

import com.google.common.collect.Lists;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.List;


/**
 * @Author: xmj
 * @Configuration 把bean标记成
 */
@Configuration
public class LogFilterConfig {

    /**
     * 1.构造filter
     * 2.配置拦截urlPattern
     * 3.利用FilterRegistrationBean进行包装
     *
     * @return
     */
    @Bean
    public FilterRegistrationBean logFilter() {
        //1.
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new LogFilter());
        //2.
        List<String> urlList = Lists.newArrayList();
        urlList.add("*");//*代表拦截所有URL
        //3.
        filterRegistrationBean.setUrlPatterns(urlList);//把需要拦截的URL放入FilterBen
        return filterRegistrationBean;
    }

}

启动访问，查看控制台

"C:\Program Files\Java\jdk1.8.0_131\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:50916,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=50915 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -javaagent:C:\Users\Administrator\.IntelliJIdea2018.3\system\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_131\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\rt.jar;D:\Code\demo222\target\classes;D:\codeSup\repository\org\springframework\boot\spring-boot-starter-web\2.1.4.RELEASE\spring-boot-starter-web-2.1.4.RELEASE.jar;D:\codeSup\repository\org\springframework\boot\spring-boot-starter\2.1.4.RELEASE\spring-boot-starter-2.1.4.RELEASE.jar;D:\codeSup\repository\org\springframework\boot\spring-boot\2.1.4.RELEASE\spring-boot-2.1.4.RELEASE.jar;D:\codeSup\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.4.RELEASE\spring-boot-autoconfigure-2.1.4.RELEASE.jar;D:\codeSup\repository\org\springframework\boot\spring-boot-starter-logging\2.1.4.RELEASE\spring-boot-starter-logging-2.1.4.RELEASE.jar;D:\codeSup\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\codeSup\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\codeSup\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.2\log4j-to-slf4j-2.11.2.jar;D:\codeSup\repository\org\apache\logging\log4j\log4j-api\2.11.2\log4j-api-2.11.2.jar;D:\codeSup\repository\org\slf4j\jul-to-slf4j\1.7.26\jul-to-slf4j-1.7.26.jar;D:\codeSup\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;D:\codeSup\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;D:\codeSup\repository\org\springframework\boot\spring-boot-starter-json\2.1.4.RELEASE\spring-boot-starter-json-2.1.4.RELEASE.jar;D:\codeSup\repository\com\fasterxml\jackson\core\jackson-databind\2.9.8\jackson-databind-2.9.8.jar;D:\codeSup\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;D:\codeSup\repository\com\fasterxml\jackson\core\jackson-core\2.9.8\jackson-core-2.9.8.jar;D:\codeSup\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.8\jackson-datatype-jdk8-2.9.8.jar;D:\codeSup\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.8\jackson-datatype-jsr310-2.9.8.jar;D:\codeSup\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.8\jackson-module-parameter-names-2.9.8.jar;D:\codeSup\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.4.RELEASE\spring-boot-starter-tomcat-2.1.4.RELEASE.jar;D:\codeSup\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.17\tomcat-embed-core-9.0.17.jar;D:\codeSup\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.17\tomcat-embed-el-9.0.17.jar;D:\codeSup\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.17\tomcat-embed-websocket-9.0.17.jar;D:\codeSup\repository\org\hibernate\validator\hibernate-validator\6.0.16.Final\hibernate-validator-6.0.16.Final.jar;D:\codeSup\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;D:\codeSup\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;D:\codeSup\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;D:\codeSup\repository\org\springframework\spring-web\5.1.6.RELEASE\spring-web-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-beans\5.1.6.RELEASE\spring-beans-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-webmvc\5.1.6.RELEASE\spring-webmvc-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-aop\5.1.6.RELEASE\spring-aop-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-context\5.1.6.RELEASE\spring-context-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-expression\5.1.6.RELEASE\spring-expression-5.1.6.RELEASE.jar;D:\codeSup\repository\mysql\mysql-connector-java\8.0.15\mysql-connector-java-8.0.15.jar;D:\codeSup\repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar;D:\codeSup\repository\org\springframework\spring-core\5.1.6.RELEASE\spring-core-5.1.6.RELEASE.jar;D:\codeSup\repository\org\springframework\spring-jcl\5.1.6.RELEASE\spring-jcl-5.1.6.RELEASE.jar;D:\codeSup\repository\com\google\guava\guava\20.0\guava-20.0.jar;D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.2\lib\idea_rt.jar" com.example.demo.DemoApplication
Connected to the target VM, address: '127.0.0.1:50916', transport: 'socket'

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.4.RELEASE)

2019-04-13 13:16:00.683  INFO 12180 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication on Win10-4 with PID 12180 (D:\Code\demo222\target\classes started by Administrator in D:\Code\demo222)
2019-04-13 13:16:00.694  INFO 12180 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2019-04-13 13:16:01.763  INFO 12180 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-04-13 13:16:01.783  INFO 12180 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-04-13 13:16:01.784  INFO 12180 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.17]
2019-04-13 13:16:01.905  INFO 12180 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-04-13 13:16:01.905  INFO 12180 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1162 ms
2019-04-13 13:16:01.944  INFO 12180 --- [           main] com.example.demo.filter.LogFilter        : 容器初始化
2019-04-13 13:16:02.089  INFO 12180 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-04-13 13:16:02.244  INFO 12180 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2019-04-13 13:16:02.248  INFO 12180 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.931 seconds (JVM running for 2.988)
2019-04-13 13:16:12.387  INFO 12180 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-04-13 13:16:12.387  INFO 12180 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2019-04-13 13:16:12.392  INFO 12180 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 5 ms
2019-04-13 13:16:12.400  INFO 12180 --- [nio-8080-exec-1] com.example.demo.filter.LogFilter        : 请求进来了

“容器初始化”，“请求进来了”都打印出来了。