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Weblogic database Servlet

import  java.sql.Connection;
 import  java.sql.ResultSet;
 import  java.sql.ResultSetMetaData;
 import  java.sql.SQLException;
 import  java.sql.Statement;
 import  java.util.Hashtable;

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

 public   class  WeblogicDbServlet  extends  HttpServlet  {

  DataSource pool;

   public   void  init()  throws  ServletException  {

    Context env  =   null ;

    Hashtable ht  =   new  Hashtable();
    ht.put(Context.INITIAL_CONTEXT_FACTORY,
         " weblogic.jndi.WLInitialContextFactory " );
     // ht.put(Context.PROVIDER_URL,"t3: // localhost:7001");

     try   {

      env  =   new  InitialContext(ht);
      pool  =  (javax.sql.DataSource) env.lookup( " oracle-8i-athletes " );

       if  (pool  ==   null )
         throw   new  ServletException(
             " 'oracle-8i-athletes' is an unknown DataSource " );

    }   catch  (NamingException ne)  {

       throw   new  ServletException(ne);

    }

  }

   public   void  doGet(HttpServletRequest request, HttpServletResponse response)
       throws  ServletException, java.io.IOException  {

    String sql  =   " select * from athlete " ;
    Connection conn  =   null ;
    Statement stmt  =   null ;
    ResultSet rs  =   null ;
    ResultSetMetaData rsm  =   null ;

    response.setContentType( " text/html " );
    java.io.PrintWriter out  =  response.getWriter();
    out
        .println( " <html><head><title>Weblogic Database Access</title></head><body> " );
    out.println( " <h2>Database info</h2> " );
    out.println( " <table border='1'><tr> " );

     try   {

      conn  =  pool.getConnection();
      stmt  =  conn.createStatement();

      rs  =  stmt.executeQuery(sql);  rsm  =  rs.getMetaData();
       int  colCount  =  rsm.getColumnCount();

       // print column names
       for  ( int  i  =   1 ; i  <=  colCount;  ++ i)  {

        out.println( " <th> "   +  rsm.getColumnName(i)  +   " </th> " );
      }

      out.println( " </tr> " );

       while  (rs.next())  {

        out.println( " <tr> " );

         for  ( int  i  =   1 ; i  <=  colCount;  ++ i)
          out.println( " <td> "   +  rs.getString(i)  +   " </td> " );

        out.println( " </tr> " );
      }

    }   catch  (Exception e)  {

       throw   new  ServletException(e.getMessage());

    }   finally   {

       try   {

        stmt.close();
        conn.close();

      }   catch  (SQLException sqle)  {
      }

    }
    out.println( " </table></body></html> " );
    out.close();

  }   // doGet

}  

posted on 2006-05-14 00:43 record java and net 阅读(395) 评论(0)  编辑  收藏 所属分类: Jsp&&Web


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