java.lang.ClassNotFoundException：com.mysql.jdbc.Driver [英] java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

问题描述

编译java程序时出现此错误

I am getting this error when compiling my java program

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

然后我知道我应该添加 mysql-connector-java的路径-3.1.14-bin.jar 到java类路径。我使用的是Windows XP，我在controlpanel / system / enviromental变量中编辑了类路径

Then I knew that I should add the path of mysql-connector-java-3.1.14-bin.jar to the java classpath. I am using Windows XP, I edited the classpath in the controlpanel/system/enviromental variables

类路径为：。; C：\ j2sdk1 .4.2_16\jre\lib;

现在变为：。; C：\ j2sdk1 .4.2_16\jre\lib; C：\Program Files \mysql-connector-java-3.1.144

但是，我仍然得到相同的错误，此外，当我在cmd中键入set classpath（只是为了检查当前的类路径）我得到：

however, i still get the same error, moreover, when I type set classpath in the cmd ( just to check what is the current classpath ) i get :

CLASSPATH= .;C:\j2sdk1.4.2_16\jre\lib;

任何人都可以帮我解决这个问题吗？

can anyone help me fix this ?

推荐答案

你必须在类路径中包含jar文件的完整路径（包括文件名）：

You have to put the full path to the jarfile in the classpath (including the filename):

.;C:\j2sdk1.4.2_16\jre\lib;
C:\Program Files\mysql-connector-java-3.1.144\mysql-connector-java-3.1.14-bin.jar

正如Hippo所说，更改后必须重新启动 cmd 。如果它不起作用，启动你的程序如下：

As Hippo said, you have to restart cmd after changing that. If it doesn't work, launch your program like this:

java -cp ".;C:\j2sdk1.4.2_16\jre\lib;
C:\Program Files\mysql-connector-java-3.1.144\mysql-connector-java-3.1.14-bin.jar"
my.class.Name

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