Question

大家好我知道openhift线程的No Suitable Driver Found Error之前已经解决但是，当我从eclipse（maven one）部署一个项目时我得到after the multiple errors我试图部署war文件（一个动态的web项目）在webapp文件夹上，然后只是git add，commit和push，最后我得到了我的servlet运行但我无法与mysql数据库通信我已经将mysql_connector添加到web-inf / lib /文件夹但仍然没有！就像我说我在一个动态的Web项目上所以我不能将依赖项添加到pom.xml文件有没有人有想法？

我的java文件：

import java.io.*;

//import java.util.*;
//import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

//krijojme nje klase qe zgjaton superclassen HttpServlet
public class DBConnection extends HttpServlet {
    public static final String MYSQL_USERNAME = System.getenv("OPENSHIFT_MYSQL_DB_USERNAME");
    public static final String MYSQL_PASSWORD = System.getenv("OPENSHIFT_MYSQL_DB_PASSWORD");
    public static final String MYSQL_DATABASE_HOST = System.getenv("OPENSHIFT_MYSQL_DB_HOST");
    public static final String MYSQL_DATABASE_PORT = System.getenv("OPENSHIFT_MYSQL_DB_PORT");
    public static final String MYSQL_DATABASE_NAME = "jbossews";
  /**
     * kjo ketu nuk e di per cfare perdoret po duhet vene 
     */
    private static final long serialVersionUID = 1L;

    //krijojme nje metode te klases HttpServlet me emrin service 
    //dhe qe merr 2 parametra nje reqyest dhe nje response 
    //si dhe hedh disa lloje gabimesh si psh input out exeption 
    //si dhe servlet Exception
public void service(HttpServletRequest request,
  HttpServletResponse response)
  throws IOException, ServletException{
    //ketu tregon si do te jete pergjigja jone ne kete rast e duam html
  response.setContentType("text/html");
  //dhe fillojme te paraqisim
  PrintWriter out = response.getWriter();
  out.println("<html>");
  out.println("<head><title>Servlet JDBC</title></head>");
  out.println("<body>");
  out.println("<h1>Servlet JDBC</h1>");
  out.println("</body></html>");  
  // connecting to database
  //krijon ketu parametrat per tu lidhur me databasin
  Connection con = null;
  Statement st = null;
  ResultSet rs = null;


  try {
      try {
          Class.forName("com.mysql.jdbc.Driver");
      } catch (ClassNotFoundException cnfe) {
          out.println(cnfe);

      }
      String url = "mysql://$OPENSHIFT_MYSQL_DB_HOST:$OPENSHIFT_MYSQL_DB_PORT/MYSQL_DATABASE_NAME";
      con = DriverManager.getConnection(url, MYSQL_USERNAME, MYSQL_PASSWORD);
      st = con.createStatement();
      rs = st.executeQuery("SELECT * FROM servlet"); //shkruan queryn
      // displaying records
      while(rs.next()){ //nderkohe qe ka te dhena nga query jone

      out.print(rs.getObject(1).toString());
      out.print("\t\t\t");
      out.print(rs.getObject(2).toString());
      out.print("<br>");
      }
  } catch (SQLException ex) {
      out.println(ex);
  } finally {
      try {
          if (rs != null) {
              rs.close();
          }
          if (st != null) {
              st.close();
          }
          if (con != null) {
              con.close();
          }

      } catch (SQLException ex) {
          out.println(ex);
      }
  }
}

  }

P.s我还要补充一点，我已经在localhost上尝试了我的项目并且它有效了

Answer 1

网址不应该是：

String url = "jdbc:mysql://" + MYSQL_DATABASE_HOST + ":" + MYSQL_DATABASE_PORT +
    "/" + MYSQL_DATABASE_NAME;

即。协议是"jdbc:mysql:"，参数不是（？）在字符串中自动替换...

在Openshift上部署war文件后找不到合适的驱动程序错误

1 个答案: