1 分别单独给某个Servlet 以及 ServletContext 设置配置信息并获取，截图展示结果
Servlet
public class zyServlet extends HttpServlet {
@Override
public void init() throws ServletException {
System.out.println("初始化");
}
@Override
public ServletConfig getServletConfig() {
ServletConfig servletConfig = super.getServletConfig();
System.out.println("zyServlet的配置对象:" + servletConfig);
return servletConfig;
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("响应客户端请求, hhhh" );
ServletConfig servletConfig = this.getServletConfig();
System.out.println("zyServlet的相关信息" + servletConfig);
}
@Override
public void destroy() {
System.out.println("zyServlet的销毁方法");
}
}
web.xml文件代码
zyServlet com.qiku.web.zyServlet zyServlet /zyServlet
运行结果：
ServletContext
@WebServlet(name = "zyServletContext" , urlPatterns = "/zycontext")
public class zyServletContext extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
ServletContext zycontext = getServletConfig().getServletContext();
ServletContext servletContext = getServletConfig().getServletContext();
System.out.println(servletContext);
Enumeration initParameterNames = zycontext.getInitParameterNames();
while(initParameterNames.hasMoreElements()){
String s = initParameterNames.nextElement();
System.out.println(s + "对应的值" + zycontext.getInitParameter(s));
}
String contextPath = zycontext.getContextPath();
System.out.println("相对路径:" + contextPath);
String realPath = zycontext.getRealPath("/");
System.out.println("绝对路径:" +realPath);
zycontext.setAttribute("param2","values2");
Object param2 = zycontext.getAttribute("param2");
System.out.println("根据属性名获得属性值:" + param2);
zycontext.removeAttribute("param2");
param2 = zycontext.getAttribute("param2");
System.out.println("根据属性名删除属性值:" + param2);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("do get");
doPost(req,resp);
}
}
xml文件 ：
username root password 123456789
结果：
