Java Utililty Methods JDBC MySQL Connection

Connection conn = null;
String url = "jdbc:mysql://localhost:3306/record";
String user = "root";
String password = "123";
try {
    Class.forName("com.mysql.jdbc.Driver");
    conn = DriverManager.getConnection(url, user, password);
} catch (Exception e) {
...

if (con == null) {
    try {
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager
                .getConnection("jdbc:mysql://localhost:3306/facturacion?user=root&password=1111");
        con.setAutoCommit(false);
    } catch (SQLException e) {
        e.printStackTrace();
...

try {
    Class.forName(strDriver).newInstance();
    connection = DriverManager.getConnection(strUrl, strMySQLUsername, strMySQLPassword);
} catch (ClassNotFoundException e) {
    e.printStackTrace();
} catch (InstantiationException e) {
    e.printStackTrace();
} catch (IllegalAccessException e) {
...

String url = "jdbc:mysql://179.188.16.53/atitudeambient2";
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(url, "atitudeambient2", "aadvmexico2355");
return con;

URI dbUri = new URI(System.getenv("CLEARDB_DATABASE_URL"));
String username = dbUri.getUserInfo().split(":")[0];
String password = dbUri.getUserInfo().split(":")[1];
String dbUrl = "jdbc:mysql://" + dbUri.getHost() + dbUri.getPath();
Connection _con = DriverManager.getConnection(dbUrl, username, password);
return _con;

Connection con = null;
try {
    Class.forName(DRIVER);
    con = (Connection) DriverManager.getConnection(URL, USER, PASSWORD);
    return con;
} catch (ClassNotFoundException e) {
    System.exit(-1);
    return null;
...

String driver = "com.mysql.jdbc.Driver";
String user = "root";
String password = "ingsoftware2013";
String host = "localhost";
String database = "Escuela";
Class.forName(driver);
Connection con = DriverManager.getConnection("jdbc:mysql://" + host + "/" + database, user, password);
con.setAutoCommit(false);
...

String url = "jdbc:mysql://localhost:3306/management";
String username = "root";
String password = "2806";
if (con != null) {
    return con;
} else {
    try {
        Class.forName("com.mysql.jdbc.Driver");
...

Connection conn = null;
String jdbcUrl = System.getProperty("jdbcurl");
String driverClass = System.getProperty("driver");
String userName = System.getProperty("username");
String userPassword = System.getProperty("password");
try {
    Class.forName(driverClass).newInstance();
    conn = DriverManager.getConnection(jdbcUrl, userName, userPassword);
...

Connection conn = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/desk", "root", "root");
    return conn;
} catch (Exception e) {
    e.printStackTrace();
    return null;
...