ServletContext
ServletContext是Servlet与Servlet容器之间的通信接口。Servlet容器在启动一个Web应用时，会为它创建一个ServletContext对象。每个Web应用都用唯一对应的ServletContext对象，可以把ServletContext形象地理解为Web应用的总管家，同一个Web应用中的Servlet都共享都一个总管家，Servlet对象们可以通过这个总管家来访问容器中的各种资源。
写了一个程序测试下：
public class TestServletContext extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
ServletContext context = this.getServletContext();
String contextPath = context.getContextPath();
int majorVersion = context.getMajorVersion();
int minorVersion = context.getMinorVersion();
String ServerInfo = context.getServerInfo();
resp.setContentType("text/html;charset=GB2312");
PrintWriter out = resp.getWriter();
out.println("<html><head><title>my title</title></head>");
out.println("<body>");
out.println("<br>Web应用的URL入口：" + contextPath);
out.println("<br>容器支持的Servlet的主版本号：" + majorVersion);
out.println("<br>容器支持的Servlet的次版本号： " + minorVersion);
out.println("<br>服务器信息： " + ServerInfo);
out.println("</body></html>");
out.flush();
out.close();
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
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