FAQ（13）：Access denied for user ''@'localhost' to database 'localhost:3306//test'

承接FAQ12，继续报Bug。

Log：

org.apache.ibatis.exceptions.PersistenceException: ### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user ''@'localhost' to database 'localhost:3306//test'### The error may exist in com/smbms/dao/UserMapper.xml### The error may involve com.smbms.dao.UserMapper.Usershow### The error occurred while executing a query### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user ''@'localhost' to database 'localhost:3306//test'at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)at com.sun.proxy.$Proxy4.Usershow(Unknown Source)at com.smbms.entities.UserTest.test01(UserTest.java:33)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)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.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)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.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user ''@'localhost' to database 'localhost:3306//test'at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.Util.getInstance(Util.java:408)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:873)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1710)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2191)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2222)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2017)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)at java.sql.DriverManager.getConnection(Unknown Source)at java.sql.DriverManager.getConnection(Unknown Source)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:201)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:196)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:93)at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:385)at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:138)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:60)at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)... 29 more

解决：
配置文件的url有错！导致连接数据库出了问题！！（配置文件的写法似乎多种多样。。）


原：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///localhost:3306//test
jdbc.username=root
jdbc.password=


改：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=

原因：连接数据库的url出错，必然导致访问禁止！