处理“The last packet sent successfully to the server was 0 milliseconds ago. The driver has not rec...

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:983) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.MysqlIO.(MysqlIO.java:339) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2252) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2285) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2084) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:795) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:44) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1510) ~[druid-1.1.6.jar:1.1.6]
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1575) ~[druid-1.1.6.jar:1.1.6]
    at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2450) ~[druid-1.1.6.jar:1.1.6]
Caused by: java.net.ConnectException: Connection refused: connect
    at java.base/sun.nio.ch.Net.connect0(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.connect(Net.java:574) ~[na:na]
    at java.base/sun.nio.ch.Net.connect(Net.java:563) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:588) ~[na:na]
    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:333) ~[na:na]
    at java.base/java.net.Socket.connect(Socket.java:648) ~[na:na]
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:214) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    at com.mysql.jdbc.MysqlIO.(MysqlIO.java:298) ~[mysql-connector-java-5.1.37.jar:5.1.37]
    ... 16 common frames omitted

2021-05-21 11:44:45.295 ERROR 17036 --- [eate-2073225885] com.alibaba.druid.pool.DruidDataSource   : create connection SQLException, url: jdbc:mysql://127.0.0.1:3306/?characterEncoding=UTF-8&useSSL=false&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8, errorCode 0, state 08S01

上网查了很多内容，最终发现是MySQL服务未启动

image.png

启动服务器后运行正常