dbconn.java

struts标签库,中英文版,数据添删改查,验证等功能,自己写的.

/*
 * Created on 2005-11-6
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.jackie.util;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

public class DBConn {
	private String url;//数据库URL
	 private String userName;//登录数据库用户名
	 private String password;//用户密码
	 private String driver;
	 
	 /**
	  * 返回到数据库的一个连接，在一个系统或类中，如果经常进行数据库的相关操作
	  * 会把建立数据库的连接作为一个单独的方法。
	  */
	 public Connection getConn()
	 {
	  getProperty();
	  Connection con = null;
	  try
	  {
		Class.forName(driver);
	   con = DriverManager.getConnection(url, userName, password);
	  }
	  catch(SQLException e)
	  {
	   e.printStackTrace();
	  } catch (ClassNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	    
	  return con;
	 }
	 
	 /**
	  * 读取属性配置文件
	  */
	 private void getProperty()
	 {
	  Properties prop = new Properties();
	  try
	  {
		  InputStream in=getClass().getResourceAsStream("database.properties");
			  
			  //ClassLoader.getSystemResourceAsStream("database.properties");
//		  BufferedReader in =new BufferedReader(new FileReader("database.properties"));
//	   FileInputStream in=new FileInputStream("database.properties");
	   prop.load(in);
	   in.close();
	   String driver1 = prop.getProperty("database.driver");
	   if(driver1 != null)
	    //System.setProperty("jdbc.drivers", driver);
		  driver=driver1; 
	   url = prop.getProperty("database.url");
	   userName = prop.getProperty("database.username");
	   password = prop.getProperty("database.password");  
	   System.out.println("url="+url);
	  }
	  catch(FileNotFoundException e)
	  {
	   e.printStackTrace();
	  }
	  catch(IOException e)
	  {
	   e.printStackTrace();
	  } 
	 }


	public static void main(String[] args) {
			new DBConn().getConn();
			System.out.println("已连接上数据库");
	}
}