ServletContext Java learning

A, ServletContext features

Web engineering is only one ServletContext object (all Servlet get ServletContext object are the same)

Two, ServletContext usage

　　①, get global configuration parameters

　　②, acquired Web engineering resources

　　③, according to their characteristics, data sharing among servlet

Third, verify usage

①, get global configuration parameters

Ⅰ, configuration parameters

Ⅱ, obtain configuration parameters

    ServletContext context = getServletContext();
    String address=context.getInitParameter("address");
    System.out.println(address);

Ⅲ, results