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DedicatedConnectionServlet.javaAPI DocExample3017Mon Jun 18 19:08:18 BST 2001None

DedicatedConnectionServlet

public class DedicatedConnectionServlet extends HttpServlet

Fields Summary
Connection
connection
long
connected
Constructors Summary
Methods Summary
public voiddestroy()

    // close the connection
    if (connection != null)
      try { connection.close(); } catch (SQLException ignore) { }
public voiddoGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)


    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("<html>");
    out.println("<head>");
    out.println("<title>A Dedicated Connection</title>");
    out.println("</head>");
    out.println("<body>");
    
    Statement statement = null;
    ResultSet resultSet = null;
    String    userName  = null;  
    try { 
      // test the connection
      statement = connection.createStatement();
      resultSet = statement.executeQuery(
       "select initcap(user) from sys.dual");
      if (resultSet.next())
       userName = resultSet.getString(1);
    }
    catch (SQLException e) {
     out.println(
      "DedicatedConnection.doGet() SQLException: " + 
      e.getMessage() + "<p>");
    }
    finally {
      if (resultSet != null) 
        try { resultSet.close(); } catch (SQLException ignore) { }
      if (statement != null) 
        try { statement.close(); } catch (SQLException ignore) { }
    }
    out.println("Hello " + userName + "!<p>");
    out.println(
     "This Servlet's database connection was created on " + 
     new java.util.Date(connected) + "<p>");
    out.println("</body>");
    out.println("</html>");
public voiddoPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)

    doGet(request, response);
public voidinit(javax.servlet.ServletConfig config)

    super.init(config);
    try { 
      // load the driver
      Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
    }
    catch (ClassNotFoundException e) {
      throw new UnavailableException(
       "DedicatedConnection.init() ClassNotFoundException: " + 
       e.getMessage());
    }
    catch (IllegalAccessException e) {
      throw new UnavailableException(
       "DedicatedConnection.init() IllegalAccessException: " + 
       e.getMessage());
    }
    catch (InstantiationException e) {
      throw new UnavailableException(
       "DedicatedConnection.init() InstantiationException: " + 
       e.getMessage());
    }

    try {
      // establish a connection
      connection = DriverManager.getConnection(
       "jdbc:oracle:thin:@dssw2k01:1521:orcl", "scott", "tiger");
      connected = System.currentTimeMillis();
    }
    catch (SQLException e) {
      throw new UnavailableException(
       "DedicatedConnection.init() SQLException: " + 
       e.getMessage());
    }