Jdbc连接

ConnectionFactory 类

package com.oaec.shopping.jdbc;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class ConnectionFactory {
private static String DRIVER;
private static String URL;
private static String UNAME;
private static String UPASS;

// 在类被加载时执行,只会执行一次
static {
// 从配置文件读取键值对
// 存储键值对--集合
Properties prop = new Properties();
try {
// 把properties文件中的数据加载到prop对象中
// 要求:ConnectionFactory类和jdbc.properties在同一个包下
prop.load(ConnectionFactory.class.getResourceAsStream("jdbc.properties"));
// value=getProperty(key):通过键获取值
DRIVER = prop.getProperty("driver");
URL = prop.getProperty("url");
UNAME = prop.getProperty("username");
UPASS = prop.getProperty("password");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public static Connection getConnection() {
Connection conn = null;
try {
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL, UNAME, UPASS);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}

public static void main(String[] args) {
System.out.println(ConnectionFactory.getConnection());
}
}





jdbc.properties文件



driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ye_mart?useUnicode=true&characterEncoding=utf-8
username=root
password=