Question

我正在尝试将我的代码从linux移植到mac OSX LION。以下方法适用于linux。

Connection getConnection() throws SQLException{
    String url = "jdbc:mysql://localhost/";
    return DriverManager.getConnection(url, "root", "mypassword");
}

但它不适用于我的Mac。我正在使用XAMMP，因此我的数据库的路径是/Applications/XAMPP/xamppfiles/bin/mysql。我得到的错误是

Exception in thread "main" java.sql.SQLException: 
    No suitable driver found for jdbc:mysql://localhost/
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:185)

根据以下帖子的反馈进行更新：

我下载了jar并将其添加到项目的构建路径中。当我尝试添加Class.forName("com.mysql.jdbc.Driver")时，我收到编译错误，因此我将其评论出来。然后我运行程序以获得以下错误：

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:350)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2408)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2445)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2230)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
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:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at learning.database.Classroom.getConnection(Classroom.java:42)
at learning.database.Classroom.main(Classroom.java:239)

Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:432)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:218)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
... 16 more

Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

Answer 1

JAVA JDK没有特定的SQL驱动程序（即mySQL，postgre，MS SQL等）。您需要单独下载并安装它们。可以在此处找到java mysql连接器的下载链接：

http://dev.mysql.com/downloads/connector/j/

它表示将驱动程序放在类路径中，但您也可以将它放在IDE的构建路径中，根据您的操作可能会更容易。

Answer 2

确保mysql jdbc连接器位于CLASSPATH中。您可能还需要加载驱动程序，在尝试获取连接之前添加以下行：

Class.forName("com.mysql.jdbc.Driver");

Answer 3

你需要在mac的类路径上拥有mysql jdbc连接器jar。

没有为jdbc找到合适的驱动程序：mysql：// localhost /

3 个答案: