JDBC 连接Mysql 驱动加载

JDBC 连接Mysql 的公共类代码 

首先下载相应的驱动 Jar包 我用的是MySQL 因此下载的MySQL驱动jar包

废话不说 直接代码

public class DBUtil {

private String driver = "com.mysql.jdbc.Driver";
private String url="jdbc:mysql://localhost:3306/jdbc_text";
private String username = "root";
private String password = "12345";

Connection conn = null;

public Connection getConnection() {

if(null==conn)
{
try {
Class.forName(driver);
conn=DriverManager.getConnection(url,username,password);
} catch (ClassNotFoundException | SQLException e) {

e.printStackTrace();
}

}
return conn;
}

接着是关闭  代码如下
public void closeAll(Connection conn , Statement sta , ResultSet rs) {

if (null!=conn)
{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (sta!=conn)
{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
} if (rs!=conn)
{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}然后main 一下输出打印连接 如果打印出连接 就表明连接成功--------