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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(394) 评论(0)  编辑  收藏 所属分类: Jsp&&Web


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