/* 獲取connection 對象* /
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import Oracle.jdbc.driver.OracleDriver;

/**
 * @author sfluo
 *
 * TODO To change the template for this generated type comment go to Window -
 * PReferences - Java - Code Style - Code Templates
 */
public class DBUtil {

 public static Connection conn;

 public static Connection getConnection() {

  try {

   DriverManager.registerDriver(new OracleDriver());
   conn = DriverManager.getConnection(
     "jdbc:oracle:thin:@10.100.143.161:1521:gb02", "gib", "gib");
  } catch (SQLException e) {
   e.printStackTrace();
  }

  return conn;
 }

}

利用ThreadLocal保存connection對象
package conn;

import java.sql.Connection;
import java.sql.SQLException;

/**
 * @author sfluo
 *
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public class ConnectionManage {
 private static ThreadLocal currentConn = new ThreadLocal();

 public static Connection currentConnection() {

  Connection conn = (Connection) currentConn.get();
  if (conn == null) {
   conn = DBUtil.getConnection();
   currentConn.set(conn);
   openTransaction();
  }
  return conn;
 }

 public static void closeConnection() {
  try {
   Connection conn = (Connection) currentConn.get();
   currentConn.set(null);
   if (conn != null) {
    conn.close();
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

 public static void openTransaction() {
  try {
   Connection conn = currentConnection();
   conn.setAutoCommit(false);
   conn.setTransactionIsolation(2);
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

 public static void commit() {
  try {
   Connection conn = currentConnection();
   if (conn != null)
    conn.commit();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }