700字范文 > 连接数据库出错：java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/

连接数据库出错：java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/

时间：2020-05-13 10:52:57

连接数据库出错

java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/

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=falseat 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$ConnectionHandler.process(AbstractProtocol.java:754)at org.apache..NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)at org.apache..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, 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 causejava.lang.NullPointerExceptionat 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$ConnectionHandler.process(AbstractProtocol.java:754)at org.apache..NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)at org.apache..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：