Question

用eclipse连接mysql运行程序出现了下面的问题，求高手解决！

Exception in thread "main" java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3558)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3490)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3996)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1284)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2142)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:781)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:207)
at newSql.QueryJFrame.<init>(QueryJFrame.java:18)
at newSql.QueryJFrame.main(QueryJFrame.java:54)

Answer 1

Exception in thread "main" java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
访问数据库被拒绝，根据上面的异常信息，可以知道应该是你没有设置连接数据库的用户名和密码

Answer 2

数据库连接的密码错误

Answer 3

把你连接数据库的代码发一下。
按照上面的问题，是你连接的账号有问题

Answer 4

用户名 密码不匹配问题

Answer 5

应该是没有找到数据库驱动 你打出来日志看看

Answer 6

passowrd 密码问题吧。。