我是新来的postgresql和JDBC.I无法找出我的错误。我已经正确填写了端口号,密码和用户名。通过servlet连接postgresql的错误
我的代码:
package ieiPackage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
/**
* Servlet implementation class login1
*/
@WebServlet("/login1")
public class login1 extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public login1() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("-------- PostgreSQL "
+ "JDBC Connection Testing ------------");
try {
Class.forName("org.postgresql.Driver");
} catch (ClassNotFoundException e) {
System.out.println("Where is your PostgreSQL JDBC Driver? "
+ "Include in your library path!");
e.printStackTrace();
return;
}
System.out.println("PostgreSQL JDBC Driver Registered!");
Connection connection = null;
try {
connection = DriverManager.getConnection(
"jdbc:postgresql://localhost:5432/members","xxxx","xxxx");
} catch (SQLException e) {
System.out.println("Connection Failed! Check output console");
e.printStackTrace();
return;
}
if (connection != null) {
System.out.println("You made it, take control your database now!");
} else {
System.out.println("Failed to make connection!");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
在控制台中的错误:
-------- PostgreSQL的JDBC连接测试--------- --- 您的PostgreSQL JDBC驱动程序在哪里?包含在你的图书馆路径中! 抛出java.lang.ClassNotFoundException:org.postgresql.Driver 在org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720) 在org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java: 1571) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at ieiPackage.login1.doGet(login1.java:36) at javax.servlet.http。 HttpServlet.service(HttpServlet.java:620) 在javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 在org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain。的java:208) 在org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 在有机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) 在org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 在org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) 的组织。 apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter 。服务(CoyoteAdapter.java:408) 在org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) 在org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:607) org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:313) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor $ Worker。运行(未知源) at java.lang.Thread.run(Unknown Source)
-1,您自己的错误信息包括原因和解决方案 –