java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver

java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1856)        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1705)        at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:126)        at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)        at java.lang.Class.forName0(Native Method)        at java.lang.Class.forName(Unknown Source)        at org.apache.jsp.chapter5.login_005fcheck_jsp._jspService(login_005fcheck_jsp.java:117)        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)        at java.lang.Thread.run(Unknown Source)ÕýÈçÌâÄ¿Ëùʾ£¬eclipseÁ¬½Ó²»ÉÏmysql,±íʾÒѾ­µ¼ÈëmysqlÇý¶¯°ü£¬²¢ÇÒ·¾¶
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  Class.forName("com.mysql.jdbc.Driver");