在项目启动的时候需要做一些初始化的操作，比如初始化线程池，提前加载好加密证书等。为了达到这个目的，SpringBoot提供了ApplicationRunner接口和CommandLineRunner接口，这两个接口都有一个run()方法，在实现接口时需要覆盖该方法，不同之处在于ApplicationRunner的优先级大于CommandLineRunner，当然你可以给CommandLineRunner指定@Order(1)注解，使其优先级大于ApplicationRunner。
    使ApplicationRunner接口与CommandLineRunner接口生效的方式有两种：

    • 自定义类实现接口

    • 主启动类实现接口 :::info 入参格式 ::: 启动参数的格式为--name=liuyanntes空格--email==liuyanntes@163.com ```java class SimpleCommandLineArgsParser {

      /**

      • Parse the given {@code String} array based on the rules described {@linkplain
      • SimpleCommandLineArgsParser above}, returning a fully-populated
      • {@link CommandLineArgs} object.
      • @param args command line arguments, typically from a {@code main()} method */ public CommandLineArgs parse(String… args) { CommandLineArgs commandLineArgs = new CommandLineArgs(); for (String arg : args) {
        1.  if (arg.startsWith("--")) {
        2.      String optionText = arg.substring(2);
        3.      String optionName;
        4.      String optionValue = null;
        5.      int indexOfEqualsSign = optionText.indexOf('=');
        6.      if (indexOfEqualsSign > -1) {
        7.          optionName = optionText.substring(0, indexOfEqualsSign);
        8.          optionValue = optionText.substring(indexOfEqualsSign + 1);
        9.      }
        10.      else {
        11.          optionName = optionText;
        12.      }
        13.      if (optionName.isEmpty()) {
        14.          throw new IllegalArgumentException("Invalid argument syntax: " + arg);
        15.      }
        16.      commandLineArgs.addOptionArg(optionName, optionValue);
        17.  }
        18.  else {
        19.      commandLineArgs.addNonOptionArg(arg);
        20.  }
        } return commandLineArgs; }

    }

    1. ![image.png](https://cdn.nlark.com/yuque/0/2022/png/750797/1650129058792-192f8ebb-4cc5-407c-aeb5-ac684e265b1e.png#averageHue=%233d4144&clientId=u22623086-4e38-4&from=paste&height=690&id=llheM&originHeight=690&originWidth=1092&originalType=binary&ratio=1&rotation=0&showTitle=false&size=70669&status=done&style=none&taskId=u4bf5ce73-256f-478f-821e-2ba1fa00470&title=&width=1092)
    2. :::info
    3. 自定义类实现接口
    4. :::
    5. 自定义`TestApplicationRunner`实现`ApplicationRunner`
    6. ```java
    7. package com.example.demo.runner;
    10. import org.springframework.boot.ApplicationArguments;
    11. import org.springframework.boot.ApplicationRunner;
    12. import org.springframework.stereotype.Component;
    14. import java.util.Arrays;
    16. @Component
    17. public class TestApplicationRunner implements ApplicationRunner {
    19.     @Override
    20.     public void run(ApplicationArguments args) {
    21.         System.out.println("===MyApplicationRunner===" + Arrays.asList(args.getSourceArgs()));
    22.         System.out.println("===getOptionNames========" + args.getOptionNames());
    23.         System.out.println("===name=======" + args.getOptionValues("name"));
    24.         System.out.println("==email========" + args.getOptionValues("email"));
    25.     }
    26. }

    再创建一个TestCommandLineRunner实现CommandLineRunner

    1. package com.example.demo.runner;
    4. import org.springframework.boot.CommandLineRunner;
    5. import org.springframework.stereotype.Component;
    7. import java.util.Arrays;
    9. @Component
    10. public class TestCommandLineRunner implements CommandLineRunner {
    11.     @Override
    12.     public void run(String... args) {
    13.         System.out.println("===CommandLineRunner===" + Arrays.asList(args));
    14.     }
    15. }

    主启动类DemoApplication

    1. package com.example.demo;
    3. import org.springframework.boot.CommandLineRunner;
    4. import org.springframework.boot.SpringApplication;
    5. import org.springframework.boot.autoconfigure.SpringBootApplication;
    7. import java.util.Arrays;
    9. @SpringBootApplication
    10. public class DemoApplication{
    11.     public static void main(String[] args) {
    12.         SpringApplication.run(DemoApplication.class, args);
    13.         System.out.println("主启动类结束");
    14.     }
    16. }

    启动日志

    1. D:\App\java1.8\jdk\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:D:\App\IntelliJ IDEA 2020.3.1\lib\idea_rt.jar=58988:D:\App\IntelliJ IDEA 2020.3.1\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath D:\App\java1.8\jdk\jre\lib\charsets.jar;D:\App\java1.8\jdk\jre\lib\deploy.jar;D:\App\java1.8\jdk\jre\lib\ext\access-bridge-64.jar;D:\App\java1.8\jdk\jre\lib\ext\cldrdata.jar;D:\App\java1.8\jdk\jre\lib\ext\dnsns.jar;D:\App\java1.8\jdk\jre\lib\ext\jaccess.jar;D:\App\java1.8\jdk\jre\lib\ext\jfxrt.jar;D:\App\java1.8\jdk\jre\lib\ext\localedata.jar;D:\App\java1.8\jdk\jre\lib\ext\nashorn.jar;D:\App\java1.8\jdk\jre\lib\ext\sunec.jar;D:\App\java1.8\jdk\jre\lib\ext\sunjce_provider.jar;D:\App\java1.8\jdk\jre\lib\ext\sunmscapi.jar;D:\App\java1.8\jdk\jre\lib\ext\sunpkcs11.jar;D:\App\java1.8\jdk\jre\lib\ext\zipfs.jar;D:\App\java1.8\jdk\jre\lib\javaws.jar;D:\App\java1.8\jdk\jre\lib\jce.jar;D:\App\java1.8\jdk\jre\lib\jfr.jar;D:\App\java1.8\jdk\jre\lib\jfxswt.jar;D:\App\java1.8\jdk\jre\lib\jsse.jar;D:\App\java1.8\jdk\jre\lib\management-agent.jar;D:\App\java1.8\jdk\jre\lib\plugin.jar;D:\App\java1.8\jdk\jre\lib\resources.jar;D:\App\java1.8\jdk\jre\lib\rt.jar;D:\devspace\test\target\classes;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-web\2.6.5\spring-boot-starter-web-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter\2.6.5\spring-boot-starter-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot\2.6.5\spring-boot-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-autoconfigure\2.6.5\spring-boot-autoconfigure-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-logging\2.6.5\spring-boot-starter-logging-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\yaml\snakeyaml\1.29\snakeyaml-1.29.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-json\2.6.5\spring-boot-starter-json-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-databind\2.13.2\jackson-databind-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-annotations\2.13.2\jackson-annotations-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-core\2.13.2\jackson-core-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.2\jackson-datatype-jdk8-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.2\jackson-datatype-jsr310-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.2\jackson-module-parameter-names-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-tomcat\2.6.5\spring-boot-starter-tomcat-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-core\9.0.60\tomcat-embed-core-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-el\9.0.60\tomcat-embed-el-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.60\tomcat-embed-websocket-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-web\5.3.17\spring-web-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-beans\5.3.17\spring-beans-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-webmvc\5.3.17\spring-webmvc-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-aop\5.3.17\spring-aop-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-context\5.3.17\spring-context-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-expression\5.3.17\spring-expression-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-core\5.3.17\spring-core-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-jcl\5.3.17\spring-jcl-5.3.17.jar com.example.demo.DemoApplication --name=liuyanntes --email==liuyanntes@163.com
    3.   .   ____          _            __ _ _
    4.  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    5. ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
    6.  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
    7.   '  |____| .__|_| |_|_| |_\__, | / / / /
    8.  =========|_|==============|___/=/_/_/_/
    9.  :: Spring Boot ::                (v2.6.5)
    11. 2022-04-17 00:59:49.608  INFO 5576 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 1.8.0_202 on DESKTOP-13536KB with PID 5576 (D:\devspace\test\target\classes started by dell in D:\devspace\test)
    12. 2022-04-17 00:59:49.608  INFO 5576 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to 1 default profile: "default"
    13. 2022-04-17 00:59:50.813  INFO 5576 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    14. 2022-04-17 00:59:50.828  INFO 5576 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    15. 2022-04-17 00:59:50.828  INFO 5576 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.60]
    16. 2022-04-17 00:59:50.969  INFO 5576 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    17. 2022-04-17 00:59:50.969  INFO 5576 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1267 ms
    18. 2022-04-17 00:59:51.344  INFO 5576 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
    19. 2022-04-17 00:59:51.344  INFO 5576 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 2.272 seconds (JVM running for 3.351)
    20. ===MyApplicationRunner===[--name=liuyanntes, --email==liuyanntes@163.com]
    21. ===getOptionNames========[name, email]
    22. ===name=======[liuyanntes]
    23. ==email========[=liuyanntes@163.com]
    24. ===CommandLineRunner===[--name=liuyanntes, --email==liuyanntes@163.com]
    25. 主启动类结束

    执行顺序为：

    1. 主程序启动
    2. 执行TestApplicationRunner.run，
    3. 执行TestCommandLineRunner.run，
    4. 主启动类结束 :::info 主启动类实现接口 ::: 令主启动类DemoApplication去实现TestApplicationRunner或者TestCommandLineRunner
      主启动类实现ApplicationRunner： ```java package com.example.demo;

    import org.springframework.boot.ApplicationArguments; import org.springframework.boot.ApplicationRunner; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;

    import java.util.Arrays;

    @SpringBootApplication public class DemoApplication implements ApplicationRunner { //主类注释 //分支合并分支合并分支合并 public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); System.out.println(“主启动类结束”); }

    1. @Override
    2. public void run(ApplicationArguments args) throws Exception {
    3.     System.out.println("这是重写的启动类run方法"+ Arrays.asList(args));
    5.     System.out.println("===MyApplicationRunner===" + Arrays.asList(args.getSourceArgs()));
    6.     System.out.println("===getOptionNames========" + args.getOptionNames());
    7.     System.out.println("===name=======" + args.getOptionValues("name"));
    8.     System.out.println("==email========" + args.getOptionValues("email"));
    9. }

    }

    启动日志： D:\App\java1.8\jdk\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always “-javaagent:D:\App\IntelliJ IDEA 2020.3.1\lib\idea_rt.jar=59676:D:\App\IntelliJ IDEA 2020.3.1\bin” -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath D:\App\java1.8\jdk\jre\lib\charsets.jar;D:\App\java1.8\jdk\jre\lib\deploy.jar;D:\App\java1.8\jdk\jre\lib\ext\access-bridge-64.jar;D:\App\java1.8\jdk\jre\lib\ext\cldrdata.jar;D:\App\java1.8\jdk\jre\lib\ext\dnsns.jar;D:\App\java1.8\jdk\jre\lib\ext\jaccess.jar;D:\App\java1.8\jdk\jre\lib\ext\jfxrt.jar;D:\App\java1.8\jdk\jre\lib\ext\localedata.jar;D:\App\java1.8\jdk\jre\lib\ext\nashorn.jar;D:\App\java1.8\jdk\jre\lib\ext\sunec.jar;D:\App\java1.8\jdk\jre\lib\ext\sunjce_provider.jar;D:\App\java1.8\jdk\jre\lib\ext\sunmscapi.jar;D:\App\java1.8\jdk\jre\lib\ext\sunpkcs11.jar;D:\App\java1.8\jdk\jre\lib\ext\zipfs.jar;D:\App\java1.8\jdk\jre\lib\javaws.jar;D:\App\java1.8\jdk\jre\lib\jce.jar;D:\App\java1.8\jdk\jre\lib\jfr.jar;D:\App\java1.8\jdk\jre\lib\jfxswt.jar;D:\App\java1.8\jdk\jre\lib\jsse.jar;D:\App\java1.8\jdk\jre\lib\management-agent.jar;D:\App\java1.8\jdk\jre\lib\plugin.jar;D:\App\java1.8\jdk\jre\lib\resources.jar;D:\App\java1.8\jdk\jre\lib\rt.jar;D:\devspace\test\target\classes;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-web\2.6.5\spring-boot-starter-web-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter\2.6.5\spring-boot-starter-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot\2.6.5\spring-boot-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-autoconfigure\2.6.5\spring-boot-autoconfigure-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-logging\2.6.5\spring-boot-starter-logging-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\yaml\snakeyaml\1.29\snakeyaml-1.29.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-json\2.6.5\spring-boot-starter-json-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-databind\2.13.2\jackson-databind-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-annotations\2.13.2\jackson-annotations-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-core\2.13.2\jackson-core-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.2\jackson-datatype-jdk8-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.2\jackson-datatype-jsr310-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.2\jackson-module-parameter-names-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-tomcat\2.6.5\spring-boot-starter-tomcat-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-core\9.0.60\tomcat-embed-core-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-el\9.0.60\tomcat-embed-el-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.60\tomcat-embed-websocket-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-web\5.3.17\spring-web-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-beans\5.3.17\spring-beans-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-webmvc\5.3.17\spring-webmvc-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-aop\5.3.17\spring-aop-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-context\5.3.17\spring-context-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-expression\5.3.17\spring-expression-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-core\5.3.17\spring-core-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-jcl\5.3.17\spring-jcl-5.3.17.jar com.example.demo.DemoApplication —name=liuyanntes —email==liuyanntes@163.com

    . _ /\ / ‘ () \ \ \ \ ( ( )__ | ‘ | ‘| | ‘ \/ ` | \ \ \ \ \/ )| |)| | | | | || (| | ) ) ) ) ‘ |_| .|| ||| |\, | / / / / =========||==============|__/=///_/ :: Spring Boot :: (v2.6.5)

    2022-04-17 01:17:53.939 INFO 6812 —- [ main] com.example.demo.DemoApplication : Starting DemoApplication using Java 1.8.0_202 on DESKTOP-13536KB with PID 6812 (D:\devspace\test\target\classes started by dell in D:\devspace\test) 2022-04-17 01:17:53.943 INFO 6812 —- [ main] com.example.demo.DemoApplication : No active profile set, falling back to 1 default profile: “default” 2022-04-17 01:17:55.260 INFO 6812 —- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2022-04-17 01:17:55.273 INFO 6812 —- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2022-04-17 01:17:55.274 INFO 6812 —- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.60] 2022-04-17 01:17:55.425 INFO 6812 —- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2022-04-17 01:17:55.425 INFO 6812 —- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1414 ms 2022-04-17 01:17:55.924 INFO 6812 —- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ‘’ 2022-04-17 01:17:55.936 INFO 6812 —- [ main] com.example.demo.DemoApplication : Started DemoApplication in 2.604 seconds (JVM running for 4.239) 这是重写的启动类run方法[org.springframework.boot.DefaultApplicationArguments@6dc1484] ===MyApplicationRunner===[—name=liuyanntes, —email==liuyanntes@163.com] ===getOptionNames========[name, email] ===name=======[liuyanntes] ==email========[=liuyanntes@163.com] 主启动类结束

    1. 主启动类实现`CommandLineRunner`：
    2. ```java
    3. package com.example.demo;
    5. import org.springframework.boot.CommandLineRunner;
    6. import org.springframework.boot.SpringApplication;
    7. import org.springframework.boot.autoconfigure.SpringBootApplication;
    9. import java.util.Arrays;
    11. @SpringBootApplication
    12. public class DemoApplication implements CommandLineRunner{
    13. //主类注释
    14.     //分支合并分支合并分支合并
    15.     public static void main(String[] args) {
    16.         SpringApplication.run(DemoApplication.class, args);
    17.         System.out.println("主启动类结束");
    18.     }
    20.     @Override
    21.     public void run(String... args) throws Exception {
    22.         System.out.println("这是重写的启动类run方法"+ Arrays.asList(args));
    23.     }
    24. }
    27. 日志打印
    28. D:\App\java1.8\jdk\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:D:\App\IntelliJ IDEA 2020.3.1\lib\idea_rt.jar=59541:D:\App\IntelliJ IDEA 2020.3.1\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath D:\App\java1.8\jdk\jre\lib\charsets.jar;D:\App\java1.8\jdk\jre\lib\deploy.jar;D:\App\java1.8\jdk\jre\lib\ext\access-bridge-64.jar;D:\App\java1.8\jdk\jre\lib\ext\cldrdata.jar;D:\App\java1.8\jdk\jre\lib\ext\dnsns.jar;D:\App\java1.8\jdk\jre\lib\ext\jaccess.jar;D:\App\java1.8\jdk\jre\lib\ext\jfxrt.jar;D:\App\java1.8\jdk\jre\lib\ext\localedata.jar;D:\App\java1.8\jdk\jre\lib\ext\nashorn.jar;D:\App\java1.8\jdk\jre\lib\ext\sunec.jar;D:\App\java1.8\jdk\jre\lib\ext\sunjce_provider.jar;D:\App\java1.8\jdk\jre\lib\ext\sunmscapi.jar;D:\App\java1.8\jdk\jre\lib\ext\sunpkcs11.jar;D:\App\java1.8\jdk\jre\lib\ext\zipfs.jar;D:\App\java1.8\jdk\jre\lib\javaws.jar;D:\App\java1.8\jdk\jre\lib\jce.jar;D:\App\java1.8\jdk\jre\lib\jfr.jar;D:\App\java1.8\jdk\jre\lib\jfxswt.jar;D:\App\java1.8\jdk\jre\lib\jsse.jar;D:\App\java1.8\jdk\jre\lib\management-agent.jar;D:\App\java1.8\jdk\jre\lib\plugin.jar;D:\App\java1.8\jdk\jre\lib\resources.jar;D:\App\java1.8\jdk\jre\lib\rt.jar;D:\devspace\test\target\classes;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-web\2.6.5\spring-boot-starter-web-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter\2.6.5\spring-boot-starter-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot\2.6.5\spring-boot-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-autoconfigure\2.6.5\spring-boot-autoconfigure-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-logging\2.6.5\spring-boot-starter-logging-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\yaml\snakeyaml\1.29\snakeyaml-1.29.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-json\2.6.5\spring-boot-starter-json-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-databind\2.13.2\jackson-databind-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-annotations\2.13.2\jackson-annotations-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\core\jackson-core\2.13.2\jackson-core-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.2\jackson-datatype-jdk8-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.2\jackson-datatype-jsr310-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.2\jackson-module-parameter-names-2.13.2.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\boot\spring-boot-starter-tomcat\2.6.5\spring-boot-starter-tomcat-2.6.5.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-core\9.0.60\tomcat-embed-core-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-el\9.0.60\tomcat-embed-el-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.60\tomcat-embed-websocket-9.0.60.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-web\5.3.17\spring-web-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-beans\5.3.17\spring-beans-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-webmvc\5.3.17\spring-webmvc-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-aop\5.3.17\spring-aop-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-context\5.3.17\spring-context-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-expression\5.3.17\spring-expression-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-core\5.3.17\spring-core-5.3.17.jar;D:\devspace\apache-maven-3.3.9\myRepository\org\springframework\spring-jcl\5.3.17\spring-jcl-5.3.17.jar com.example.demo.DemoApplication --name=liuyanntes --email==liuyanntes@163.com
    30.   .   ____          _            __ _ _
    31.  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    32. ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
    33.  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
    34.   '  |____| .__|_| |_|_| |_\__, | / / / /
    35.  =========|_|==============|___/=/_/_/_/
    36.  :: Spring Boot ::                (v2.6.5)
    38. 2022-04-17 01:14:19.875  INFO 492 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 1.8.0_202 on DESKTOP-13536KB with PID 492 (D:\devspace\test\target\classes started by dell in D:\devspace\test)
    39. 2022-04-17 01:14:19.875  INFO 492 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to 1 default profile: "default"
    40. 2022-04-17 01:14:21.526  INFO 492 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    41. 2022-04-17 01:14:21.542  INFO 492 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    42. 2022-04-17 01:14:21.542  INFO 492 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.60]
    43. 2022-04-17 01:14:21.697  INFO 492 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    44. 2022-04-17 01:14:21.712  INFO 492 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1689 ms
    45. 2022-04-17 01:14:22.103  INFO 492 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
    46. 2022-04-17 01:14:22.103  INFO 492 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 2.886 seconds (JVM running for 3.95)
    47. 这是重写的启动类run方法[--name=liuyanntes, --email==liuyanntes@163.com]
    48. 主启动类结束