用jdbc连接mysql时出现以下错误提示:
Exception in thread "main" java.lang.ClassNotFoundException: org.gjt.mm.mysql.Dr
iver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.jac.database.ConMysql.getCon(ConMysql.java:29)
at com.jac.database.Test.main(Test.java:15)我已经把mysql-connector-java-3.1.12-bin.jar拷贝到java安装目录ext下了,为什么会提示找不到
org.gjt.mm.mysql.Driver呢??
Exception in thread "main" java.lang.ClassNotFoundException: org.gjt.mm.mysql.Dr
iver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.jac.database.ConMysql.getCon(ConMysql.java:29)
at com.jac.database.Test.main(Test.java:15)我已经把mysql-connector-java-3.1.12-bin.jar拷贝到java安装目录ext下了,为什么会提示找不到
org.gjt.mm.mysql.Driver呢??
iver
找不到你的类
ext是公共目录,为什么会找不到org.gjt.mm.mysql.Driver呢??
你可以通过System.getProperty("java.ext.dirs")
是不是不是 Windows版本的
就对了,多谢大家的帮忙