dbutility.java

来自「用户登录管理」· Java 代码 · 共 60 行

package org.nitpro.business;

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

public class DBUtility {

	private static DBUtility instance;
	
	private String driver;
	private String url;
	private String user;
	private String password;
	
	private DBUtility()throws Exception{
		InputStream in=getClass().getClassLoader().getResourceAsStream("database.properties");
		Properties prop=new Properties();
		prop.load(in);
		driver=prop.getProperty("driver");
		url=prop.getProperty("url");
		user=prop.getProperty("user");
		password=prop.getProperty("password");
		Class.forName(driver);
	}
	
	public static DBUtility getInstance(){
		try{
			if(instance==null){
			}
			return instance;
		}catch(Exception e){
			e.printStackTrace();
		return null;
	}
}
	
	public Connection getConnection()throws SQLException{
		Connection con;
		try{
			con=DriverManager.getConnection(url,user,password);
		}catch(SQLException e){
			e.printStackTrace();
			throw e;
		}
		return con;
	}
	
	public void closeConnection(Connection con){
		if(con !=null){
			try{
				con.close();
			}catch(SQLException e){
				e.printStackTrace();
			}
		}
	}
}