tomcat
1)下载mm.mysql-2.0.14-bin.jar包，放在tomcat目录下的common/lib文件夹中
2)在tomcat目录下的conf/server.xml中的前加入(注意:全部大写的地方要替换成你自己的东西)
                                                                            factory                                  org.apache.commons.dbcp.basicdatasourcefactory                                                                                                                  driverclassname                                      org.gjt.mm.mysql.driver                                                                                                              url                                jdbc:mysql://localhost:3306/database_name?autoreconnect=true                                                                                                           username                                   db_username                                                                               password                                 db_password                                                                                                              maxactive                                   100                  &nbs