1.背景

写了一个Spring boot 项目，引入了MySQL

 			<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.19</version>
            </dependency>

然后直接启动整个项目能正常的运行，但是写个测试类就报错

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = MySQLMointorApplication.class)
@WebAppConfiguration
public class BaseTest {
}



public class JdbcUtilsTest extends BaseTest {


    //这个工具类,主要为我们获取一个数据库连接
    private static String driverName = "com.mysql.cj.jdbc.Driver";
    private static String url = "jdbc:mysql://localhost:3306/mysql_monitor?useUnicode=true&characterEncoding=utf-8&useSSL=true\n";
    private static String username = "root";
    private static String password = "12345678";

    Connection conn = null;

    @Before
    public void getConnection() throws Exception {
        //1.加载驱动
        try {
            Class.forName(driverName);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            //System.out.println("驱动加载失败..请检查驱动包");
            throw new RuntimeException("驱动加载失败..请检查驱动包");
        }

        //2.获取和数据库的连接
        conn = DriverManager.getConnection(url, username, password);
    }

    @Test
    public void getStatus() {
        JdbcUtils.getStatus(conn);
    }
}

运行的时候报错驱动找不到

 2020-07-12 10:41:07,742 INFO - Started JdbcUtilsTest in 7.73 seconds (JVM running for 10.48)
   
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/mysql_monitor?useUnicode=true&characterEncoding=utf-8&useSSL=true


	at java.sql.DriverManager.getConnection(DriverManager.java:689)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at com.neo.utils.JdbcUtilsTest.getConnection(JdbcUtilsTest.java:36)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)