JavaWeb连接oracle数据库

package dal;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class OracleHelper {

	static final String DB_USER="sys as sysdba";
	static final String DB_PWD="******";
	static final String ORCL_URL="jdbc:oracle:thin:@localhost:1521/orcl";
	public String getUser(String findEmpno){
	
		Connection con=null;
		PreparedStatement pre=null;
		ResultSet result=null;
		String nameInOrcl=null;
		try{
			Class.forName("oracle.jdbc.driver.OracleDriver");
			con=DriverManager.getConnection(ORCL_URL,DB_USER,DB_PWD);
			String sql="select empname from t_emp where empno=?";
			pre=con.prepareStatement(sql);
			pre.setString(1,findEmpno);			
			result=pre.executeQuery();	
				while(result.next()){	
					nameInOrcl=result.getString("empname");
				}
			
		}catch(Exception ex){
			System.out.println("未能返回结果");
		}finally{
			try {
				result.close();
			} catch (SQLException e) {
				System.out.println("关闭记录集失败");
			}
			try {
				pre.close();
			} catch (SQLException e) {
				System.out.println("关闭控制器失败");
			}
			try {
				con.close();
			} catch (SQLException e) {
				System.out.println("关闭连接失败");
			}	
		}		
		return nameInOrcl;
	}
	
	
}