连接池配置文件db.properties配置
1.新建一个普通文件->改名为db.properties（后缀）手动添加属性
一般为数据库驱动类、数据库连接地址、用户名、用户密码
driver=com.mysql.jdbc.Driver url=jdbc\:mysql\://localhost\:3306/bookshop username=root password=root
2.建立一个包名为until的专门储存数据连接类，里面添加main方法进行测试
package com.bk.until;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
/**
* Title: DbConn.java
* Description: 数据库链接类
* @author tiankuan
* @created 2016-12-21 下午8:31:05
*/
public class DbConn {
private static String username=null;
private static String password=null;
private static String driver=null;
private static String url=null;
/**
* 静态代码块
*/
static{
Properties ps=new Properties();
try {
ps.load(DbConn.class.getResourceAsStream("/db.properties"));
username=ps.getProperty("username");
password=ps.getProperty("password");
driver=ps.getProperty("driver");
url=ps.getProperty("url");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
*
* @discription 获取数据库连接 导入包为SQL 非MYSQLJDBC
* @author tiankuan
* @created 2016-12-21 下午8:58:59
* @return 返回数据库连接
*/
public static Connection getConn(){
Connection con=null;
try {
Class.forName(driver);
con = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con ;
}
/**
*
* @discription 关闭数据库
* @author tiankuan
* @created 2016-12-21 下午9:40:36
* @param con
* @return connection
*/
public static Connection closeCon(Connection con){
if (con!=null) {
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return con;
}
/**
*
* @discription 数据库测试方法
* @author tiankuan
* @created 2016-12-21 下午9:41:16
* @param args
*/
public static void main(String[] args) {
try {
DbConn.getConn();
System.out.println("数据库连接成功");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}