1、下载mysql for jdbc driver.
   http://dev.mysql.com/downloads/connector/j/3.1.html
MySQL Connector/J is distributed as a .zip or .tar.gz archive containing 
the sources and class files as well as a class-file only "binary" .jar 
archive named "mysql-connector-java-3.1.10-bin.jar".

2、解压缩下载的文件，如：mysql-connector-java-3.1.10.zip

You will need to use the appropriate gui or command-line utility to un-archive 
the distribution (for example, WinZip for the .zip archive, and "tar" for 
the .tar.gz archive).

3、mysql for jdbc driver有两种安装发式：

Once you have un-archived the distribution archive,
you can install the driver in one of two ways:

第一种方法：将com和org两个目录下所有文件和目录拷贝到任何地方，比如将com和org两个目录下所有文件和目录拷贝到任何地方，比如d:/mysqlforjdbc下
            设置classpath=.;d:/mysqlforjdbc;%classpath%

Either copy the "com" and "org" subdirectories and all of their contents
to anywhere you like, and put the directory holding the "com" and "org"
subdirectories in your classpath, or...

第二种方法：将mysql-connector-java-3.1.10-bin.jar拷贝到一个地方，如：D:/Program Files/Apache Software Foundation/Tomcat 5.0/common/lib下
            设置classpath=.;D:/Program Files/Apache Software Foundation/Tomcat 5.0/common/lib/mysql-connector-java-3.1.10-bin.jar;%classpath%

或直接把mysql-connector-java-3.1.10-bin.jar拷贝到%JAVA_HOME%/jre/lib/ext下
     %JAVA_HOME%就是J2SDK的安装目录，如我的为D:/j2sdk1.4.2_06就拷贝到D:/j2sdk1.4.2_06/jre/lib/ext下

(调试java程序使用)

Put mysql-connector-java-3.1.10-bin.jar in your classpath, either by adding the 
FULL path to it to your CLASSPATH enviornment variable, or putting it
in $JAVA_HOME/jre/lib/ext.

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