5-10Servlet

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

@WebServlet(name="configServlet2",urlPatterns = "/config2",
              initParams = {
        @WebInitParam(name="username",value = "qwerty"),
        @WebInitParam(name="password",value = "1111111")
              })
public class ConfigServlet2 implements Servlet {
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        String username = servletConfig.getInitParameter("username");
        System.out.println("获取到的用户名"+username);

        Enumeration initParameterNames = servletConfig.getInitParameterNames();
        while (initParameterNames.hasMoreElements()){
            String s=initParameterNames.nextElement();
            System.out.println("获取到的参数名"+s+":  " +servletConfig.getInitParameter(s));
        }
    }

@WebServlet(name="contextServlet",urlPatterns = "/context")
public class ContextServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //获取配置信息
        ServletContext context = getServletConfig().getServletContext();
        System.out.println(context);
        System.out.println("========");
        Enumeration initParameterNames = context.getInitParameterNames();
        while (initParameterNames.hasMoreElements()){
            String s = initParameterNames.nextElement();
            System.out.println(s+"对应的值："+context.getInitParameter(s));
        }

    
        username
        root
    
    
        password
        000000000