Servlet連接到遠程mysql

Question

我試圖將我在Eclipse IDE中本地的Java Servlet程序連接到在Web托管中創建的遠程SQL數據庫。

AdminLoginServlet-

package dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import model.Model;

public class Dao 
{
     private  static String driver="com.mysql.jdbc.Driver";
     private static String url="jdbc:mysql://xyz.com/devadmin_CustomerDatabasev1";
     private static String username="USER";
     private static String password="Password";
     private static Connection con=null;
     private static ResultSet rs=null;
     public static Connection connect()
     {
          try
          {
              Class.forName(driver);
              con=DriverManager.getConnection(url,username, password);
          }
          catch(ClassNotFoundException e)
          {
                e.printStackTrace();
          }
          catch(SQLException e)
          {
               e.printStackTrace();
          }
          return con;
      }
      public static ResultSet validate(Model m, String sql)
      {
          try
          {
              connect();
              PreparedStatement ps=con.prepareStatement("select userid,password from adminlogin where userid='user' and password='password'");
              rs=ps.executeQuery();
          }
          catch(SQLException e)
          {
               e.printStackTrace();
          }
          return rs;
     }
}

我在UI上收到500錯誤代碼並出現以下錯誤-

`HTTP Status 500 -type Exception report message description 
 The server encountered an internal error that prevented it from fulfilling this request.exception
java.lang.NullPointerException
dao.Dao.validate(Dao.java:40)
controller.AdminLoginServlet.doPost(AdminLoginServlet.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

note注意在Apache Tomcat / 7.0.47日志中可以找到根本原因的完整堆棧跟蹤。

Apache Tomcat / 7.0.47`以及控制台上的以下錯誤-

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at dao.Dao.connect(Dao.java:22)
at dao.Dao.validate(Dao.java:39)
at controller.AdminLoginServlet.doPost(AdminLoginServlet.java:41)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [AdminLoginServlet] in context with path [/FirstApp] threw exception
java.lang.NullPointerException
at dao.Dao.validate(Dao.java:40)
at controller.AdminLoginServlet.doPost(AdminLoginServlet.java:41)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

我不確定如何繼續或調試這段代碼。在此先感謝任何人都可以提供的任何指針。

編輯：（2017年2月26日），我發現以下鏈接缺少Java與mysql的連接器： http : //www.ccs.neu.edu/home/kathleen/classes/cs3200/JDBCtutorial.pdf

但是我無法將其作為外部存檔添加到構建路徑中。

檢查文件夾結構

在此先感謝任何人都可以提供的任何指針。

Answer 1

您正在連接的數據庫可能沒有值，也無法檢查列名稱，或者您輸入的名稱可能錯誤，或者您可能未在WebContent文件夾下包含相應的jar文件。請仔細查看所有這些內容。