A项目：自定义一个方法：调用mysql依赖中的方法，
package com.woniu.test;
import java.sql.*;
public class Test1{
public Connection t1(){
try{
Class.forName("com.mysql.cj.jdbc.Driver");
DriverManager.getConnection("jdbc:mysql://localhost:3306/shop","root","123456");
}catch(Exception e){
e.printStackTrace();
}
return null;
}
}
<modelVersion>4.0.0</modelVersion>
<groupId>xa.woniu</groupId>
<artifactId>aaa</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.27</version>
</dependency>
B项目：自定义一个测试方法：不添加mysql依赖，依然可以使用mysql依赖
package com.woniu.test;
import org.junit.Test;
import java.sql.*;
public class Test2
{
@Test
public void t2(){
try{
Class.forName("com.mysql.cj.jdbc.Driver");
Connection conn = DriverManager.getConnection("url","uname","upwd");
System.out.println(conn);
}catch(Exception e){
e.printStackTrace();
}
}
}
<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>xa.woniu</groupId>
<artifactId>bbb</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>xa.woniu</groupId>
<artifactId>aaa</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>