Question

我正在制作一个简单的注册程序，因为我点击提交到我的IDE日志中我收到此错误：

java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:8888/login
    at java.sql.DriverManager.getConnection(DriverManager.java:689)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at Register.doPost(Register.java:18)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1017)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)
13-May-2014 10:09:48.900 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory D:\apache-tomcat-8.0.5\webapps\manager

进入我的IDE似乎已成功连接database。甚至我已经将Mysql连接器添加到库中。

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这是我的Registration.java

代码

import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class Register extends HttpServlet{
    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{

        response.setContentType("text/html");
        PrintWriter out=response.getWriter();

        String n=request.getParameter("name");
        String p=request.getParameter("password");
        String e=request.getParameter("email");
        String c=request.getParameter("userCountry");

        try{
            Connection con=DriverManager.getConnection(
                    "jdbc:mysql://localhost:8888/login", "root", "1234"
            );

            PreparedStatement ps=con.prepareStatement("insert into REGISTERUSER values(?, ?, ?, ?)");

            ps.setString(1,n);
            ps.setString(2,p);
            ps.setString(3,e);
            ps.setString(4,c);

            int i=ps.executeUpdate();
            if(i>0){
                out.print("Registered successfully..");
            }

        }catch(Exception d){d.printStackTrace();}
        out.close();
    }
}

这是我的html文件register.html

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<form action="Register" method="post">
    Name: <input type="text" name="name">
    Email: <input type="text" name="email">
    Password: <input type="password" name="password">
    Country:

    <select name="userCountry">
        <option>India</option>
        <option>Pakistan</option>
        <option>Other</option>
    </select><br><br>

    <input type="submit" value="register">
</form>
</body>
</html>

Answer 1

在Java Web应用程序中，第三方库位于WEB-INF / lib文件夹中。复制此文件夹中的jar并重新部署您的应用程序。如果您的应用程序应在每个应用程序服务器（Tomcat，Jetty，JBoss，GlassFish等）上支持这些库，请执行此操作。

Answer 2

没有合适的驱动程序表明类加载器找到了JAR，但是您的连接URL不正确。

以下是Connector / J的MySQL文档：

http://dev.mysql.com/doc/refman/5.0/en/connector-j-info.html

MySQL的默认端口是3306.您确定本地主机正在监听8888吗？

错误的代码。 Scriptlet不属于JSP。您不会关闭finally块中的任何SQL资源。

Answer 3

1）将驱动程序jar文件添加到构建路径
2）在代码中添加Class.forName("com.mysql.jdbc.Driver");。

例如：

try{
Class.forName("com.mysql.jdbc.Driver");
        Connection con=DriverManager.getConnection(
                "jdbc:mysql://localhost:8888/login", "root", "1234"
        );

＆＃34;找不到合适的司机＆＃34;得到这个错误

3 个答案: