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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