Java “线程中的异常”；“主要”；org.springframework.jdbc.CannotGetJdbcConnectionException

请帮我纠正这个错误，我是春天的新手。所以，当我试图在没有SpringMVCWeb结构的情况下运行测试数据源时，我无法理解这个错误

cd F:\NetBeansProjects\SpringContactApp; "JAVA_HOME=C:\\Program Files\\Java\\jdk1.8.0_131" cmd /c "\"\"C:\\Program Files\\NetBeans 8.0.1\\java\\maven\\bin\\mvn.bat\" -Dexec.args=\"-classpath %classpath in.ezeon.capp.test.TestDataSource\" -Dexec.executable=java -Dexec.classpathScope=test -Dmaven.ext.class.path=\"C:\\Program Files\\NetBeans 8.0.1\\java\\maven-nblib\\netbeans-eventspy.jar\" -Dfile.encoding=UTF-8 org.codehaus.mojo:exec-maven-plugin:1.2.1:exec\""
        Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
        Scanning for projects...

        ------------------------------------------------------------------------
        Building SpringContactApp 1.0-SNAPSHOT
        ------------------------------------------------------------------------

        --- exec-maven-plugin:1.2.1:exec (default-cli) @ SpringContactApp ---
        Feb 04, 2019 12:15:40 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
        INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@531d72ca: startup date [Mon Feb 04 12:15:40 IST 2019]; root of context hierarchy
        Feb 04, 2019 12:15:40 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
        INFO: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
        Exception in thread "main" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (Could not create connection to database server. Attempted reconnect 3 times. Giving up.)
            at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
            at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:619)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:870)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:931)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:941)
            at in.ezeon.capp.test.TestDataSource.main(TestDataSource.java:23)
        Caused by: java.sql.SQLException: Cannot create PoolableConnectionFactory (Could not create connection to database server. Attempted reconnect 3 times. Giving up.)
            at org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2294)
            at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2039)
            at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1533)
            at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
            at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
            ... 5 more
        Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

并找到下面这个错误的屏幕截图

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该错误与数据库连接有关。检查您正在使用的数据。可能未创建与您连接的数据库同名的数据库。

在您的情况下：

 Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
 Could not create connection to database server. Attempted reconnect 3 times. Giving up.

• 检查您的JDBCURL
• 检查数据库的可用性（在该url上，运行服务器？、端口？、数据库？理想情况下是相同的驱动程序、相同的网络..例如使用Netbeans“服务”选项卡>“数据库”）
• 检查网络/代理/防火墙，您已进入

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您能否使用相同的凭据从运行此代码的同一台计算机连接到数据库？看起来像是网络问题，您的代码无法连接数据库。

 Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
 Could not create connection to database server. Attempted reconnect 3 times. Giving up.