Java ServletContext对象用法解析

public class Servlet01 extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //获取ServletContext对象
    ServletContext context =getServletContext();
    //获取相对于服务器的相对路径获取绝对路径
    String patha=context.getRealPath("WEB-INF/classes/a.txt");
    String pathb=context.getRealPath("b.txt");
    String pathc=context.getRealPath("WEB-INF/c.txt");
    //d.txt创建在WEB04文件下，不会在服务器上找到的。以后静态资源创建在WebContent下，项目文件、配置文件在src下
    System.out.println(patha);
    System.out.println(pathb);
    System.out.println(pathc);
  }
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    doGet(request, response);
  }

public class Serlvlet03 extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //获取ServletContext对象
    ServletContext context=getServletContext();
    //获取ServletContext域中的值
    String name=(String)context.getAttribute("name");
    response.getWriter().write(name);
  }

  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    doGet(request, response);
  }
}