完美解决:Access denied for user ‘root‘@‘localhost‘ (using password: YES)

完美解决问题,主要是yml配置文件中数据库连接时密码的问题,前后加上引号.

错误日志

java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:898) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:823) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1657) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1723) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2838) ~[druid-1.2.8.jar:1.2.8]
Caused by: com.mysql.cj.exceptions.CJException: Access denied for user 'root'@'localhost' (using password: YES)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_181]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_181]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:129) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:787) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:709) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:677) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:137) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeAuthenticationProvider.proceedHandshakeWithPluggableAuthentication(NativeAuthenticationProvider.java:468) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeAuthenticationProvider.connect(NativeAuthenticationProvider.java:210) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.protocol.a.NativeProtocol.connect(NativeProtocol.java:1369) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.NativeSession.connect(NativeSession.java:133) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:842) ~[mysql-connector-java-8.0.27.jar:8.0.27]
	... 7 common frames omitted

以前的配置文件

#springboot+jdbc连接数据库
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource #指定使用阿里的连接池
    druid:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/royal?useSSL=false&autoReconnect=true&useUnicode=true&characterEncoding=UTF8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
    username: root
    password: 0429

现在的配置文件

解决：只需要在密码前后加上引号，就可以保证密码的字符特性，不被识别成数字而改变。

#springboot+jdbc连接数据库
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource #指定使用阿里的连接池
    druid:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/royal?useSSL=false&autoReconnect=true&useUnicode=true&characterEncoding=UTF8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
    username: root
    password: "0429"

在Springboot中pom.xml文件连接数据库导入的jar包

<dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druid-spring-boot-starterartifactId>
            <version>1.2.8version>
        dependency>