异常记录---使用jdbc连接mysql数据库时,配置url出现的几次问题

1.遇到的第一个问题:插入中文到数据库,中文变成???

    解决方法:在url后添加参数设置编码集

   xxxxxx?useUnicode=true&characterEncoding=utf8

url=jdbc:mysql://localhost/note?useUnicode=true&characterEncoding=utf8

2.后来有一次遇到相同的情况,复制粘贴一气呵成,然后还是不行

  解决方法:上面url中的'&'需要转义为'&'

  xxxxxx?useUnicode=true&characterEncoding=utf8

url=jdbc:mysql://localhost/note?useUnicode=true&characterEncoding=utf8

ps:当时遇到这个问题时简单记了下解决方法,没有做详细记录.刚刚拿以前的项目试了好几个都不出错了...总之上面的两种url写法都没出问题了,以后遇到了再来记录吧.

3.之后换开发工具了(IDEA),最近又要用一下jdbc,运行直接在连接数据库的地方出错了...

  打印一下错误信息:

org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.)
	at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
	at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
	at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
	at cn.fan.util.DBUtils.getConn(DBUtils.java:46)
	at cn.fan.dbTest.DataBaseTest.Test_getConn(DataBaseTest.java:12)
	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:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$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)
Caused by: java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:569)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:537)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:527)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:512)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:480)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:498)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:494)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:69)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1634)
	at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:637)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:351)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:224)
	at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
	at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
	at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556)
	at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
	... 26 more
Caused by: com.mysql.cj.core.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
	at com.mysql.cj.jdbc.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:118)
	at com.mysql.cj.mysqla.MysqlaSession.configureTimezone(MysqlaSession.java:293)
	at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:2424)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1767)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1624)
	... 33 more

扔翻译里机翻了一下,主要是说无法识别或表示多个时区......不懂,但是查到了解决方法:

在url后添加参数:?serverTimezone=UTC

url=jdbc:mysql://localhost/note?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC

然而虽然不报错了,但是不是北京时间,还要改:?serverTimezone=GMT%2B8

url=jdbc:mysql://localhost/note?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8

 ps:这里的'%2B'是'+'的转义字符,其实就是GMT+8,代表东八区(我也试过UTC%2B8,但是不行)

以后可能还会遇到这方面的问题,再随时补充了!