<mainClass>Main</mainClass>,這里填寫的路徑為/src/main/java下開始寫的
<?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>
 
  <groupId>groupId</groupId>
  <artifactId>code</artifactId>
  <version>1.0-SNAPSHOT</version>
  <dependencies>
    <dependency>
      <groupId>net.dongliu</groupId>
      <artifactId>requests</artifactId>
      <version>5.0.8</version>
    </dependency>
 
  </dependencies>
 
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
          <configuration>
            <archive>
              <manifest>
                <addClasspath>true</addClasspath>
                <mainClass>Main</mainClass> <!-- 此處為主入口-->
              </manifest>
            </archive>
          </configuration>
        </plugin>
      </plugins>
    </build>