用jdbc连接到mysql时ClassNotFoundException

当我试图在命令行运行一个简单的JavaJDBC程序时,我会遇到以下错误:

Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver/java
Caused by: java.lang.ClassNotFoundException: LoadDriver.java
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:315)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398)

下面是一个简单的Java程序,它是从JDBC文档中复制出来的:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
// Notice, do not import com.mysql.jdbc.*
// or you will have problems!
public class LoadDriver {
    public static void main(String[] args) {
        try {
            // The newInstance() call is a work around for some
            // broken Java implementations
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (Exception ex) {
        throw ex;
            // handle the error
        }
    }
}

问题是,我确信bash shell$classpath变量指向正确的.jar文件。当然,我将jdbc.jar复制到与我的程序相同的目录中,并按如下方式运行它:

java -classpath ./mysql-connector-java-5.1.12-bin.jar LoadDriver.java 

我仍然得到同样的错误。

编辑:

我遵循了PowerLord下面的建议,现在我仍然得到了几乎相同的例外。

我输入:

javac -classpath ./mysql-connector-java-5.1.12-bin.jar LoadDriver.java 
java LoadDriver

我是否将classpath标志留在第二个命令上似乎无关紧要。我仍然得到:

Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver
Caused by: java.lang.ClassNotFoundException: LoadDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:315)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398)