No suitable driver found for jdbc:mysql://localhost/

问题

I am trying to port my code from linux to mac OSX LION. The following method works on linux just fine.

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

But it's not working on my mac. I am using XAMMP so the path to my database is /Applications/XAMPP/xamppfiles/bin/mysql. The error I get reads

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)

UPDATES BASED ON FEEDBACK FROM POSTS BELOW:

I downloaded the jar and add it to the project's build path. When I try to add Class.forName("com.mysql.jdbc.Driver") I get compile error so I comment it out. Then I run the program to get the following error:

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)

回答1:

The JAVA JDK does not come with specific SQL drivers(i.e mySQL, postgre, MS SQL, etc). You need to download and install them separately. The download link for the java mysql connector can be found here:

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

It says to put the driver in your class path, but you can also put it in your IDE's build path, it might be easier depending on what you are doing.

回答2:

Make sure the mysql jdbc connector is in the CLASSPATH. You probably also need to load the driver, adding the following line before trying to get the connection:

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

回答3:

You need to have you mysql jdbc connector jar on the classpath for your mac.

来源：https://stackoverflow.com/questions/12590314/no-suitable-driver-found-for-jdbcmysql-localhost