数据源

package servlet;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

/**
* Servlet implementation class for Servlet: FirstDataSourceServlet
*
*/
public class FirstDataSourceServlet extends javax.servlet.http.HttpServlet
implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;

/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public FirstDataSourceServlet() {
super();
}

/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request,
*      HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {

doPost(request, response);
}

/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request,
*      HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {


try {
Context ctx;
ctx = new InitialContext();
DataSource ds = (DataSource) ctx
.lookup("java:/comp/env/jdbc/TestDB");
Connection conn = ds.getConnection();
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery("select * from money");
while(rs.next()){
System.out.println(rs.getString(2));
}
rs.close();
st.close();
conn.close();

} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}