JAVA 线程 ThreadLocal 线程绑定变量

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public final class ConnectionUtil {

    private ConnectionUtil() {}

    private static final ThreadLocal<Connection> conn = new ThreadLocal<>();

    public static Connection getConn() {
        Connection con = conn.get();
        if (con == null) {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                con = DriverManager.getConnection("url", "userName", "password");
                conn.set(con);
            } catch (ClassNotFoundException | SQLException e) {
                // ...
            }
        }
        return con;
    }

}