And*_*omi 2 java servlets jdbc driver openshift
大家好我知道No Suitable Driver Found Errorfor openshift线程之前已经解决但是,当我从eclipse(maven one)部署项目时遇到的多个错误我试图在webapp文件夹上部署war文件(动态web项目)然后只是git添加,提交和推送,最后我让我的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,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);
}
}
}
}
Ps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
网址不应该是这样的:
String url = "jdbc:mysql://" + MYSQL_DATABASE_HOST + ":" + MYSQL_DATABASE_PORT +
"/" + MYSQL_DATABASE_NAME;
即协议是"jdbc:mysql:",并且参数不是(？)在字符串中自动替换...