今天在做Java web项目，在进行数据库连接的时候运行后报错如下：

java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/db_mydb?characterEncoding=utf8&useSSL=false
 at java.sql.DriverManager.getConnection(Unknown Source)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at com.luojia.sims.utils.DBManager.getConn(DBManager.java:30)
 at com.luojia.sims.dao.UserDAO.addUser(UserDAO.java:22)
 at org.apache.jsp.user_005fsave_jsp._jspService(user_005fsave_jsp.java:135)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
 at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:500)
 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
 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)
四月 08, 2018 8:07:34 下午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [jsp] in context with path [/sims] threw exception [An exception occurred processing [user_save.jsp] at line [23]
20:    
21:    //璋冪敤UserDAO涓殑addUser鏂规硶瀹屾垚淇濆瓨
22:    UserDTO u = new UserDTO(0,name,pwd,sex,age,remark);
23:    boolean b = new UserDAO().addUser(u);
24:    
25:    //鏍规嵁娉ㄥ唽鐘舵?佽繘琛岃烦杞?
26:    if(b){

Stacktrace:] with root cause
java.lang.NullPointerException
 at com.luojia.sims.dao.UserDAO.addUser(UserDAO.java:24)
 at org.apache.jsp.user_005fsave_jsp._jspService(user_005fsave_jsp.java:135)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
 at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:500)
 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
 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)

出现以上错误提示表示数据库连接失败了

对

你没看错

就是辛辛苦苦要连接的数据库没连接上

报错原因看一下

是：未找到数据库驱动

怎么会没有数据库驱动？？？

那么数据库驱动到底在哪里呢？

首先，要想连接数据库，要先下载用于数据库连接的.jar包

这里给出Mysql数据连接的.jar包下载地址：