ServletConfig、ServletContext属性遍历

可以进行属性遍历；

package com.stono.servlet;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public TestServlet() {

        System.out.println("com.stono.servlet.TestServlet constructor called");

    }

    @Override

    public void init() throws ServletException {

        System.out.println("com.stono.servlet.TestServlet.init() called");

    }

    @Override

    public void destroy() {

        System.out.println("com.stono.servlet.TestServlet.destroy() called");

    }

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,

            IOException {

        ServletContext context = req.getServletContext();

        Enumeration<String> attributeNames = context.getAttributeNames();

        int i = 0;

        while (attributeNames.hasMoreElements()) {

            String nextElement = attributeNames.nextElement();

            System.out.print(++i + ":" + nextElement + ":");

            Object attribute = context.getAttribute(nextElement);

            System.out.println(attribute);

        }

        ServletConfig config2 = getServletConfig();

        String name = config2.getServletName();

        System.out.println(name);

        Enumeration<String> names = config2.getInitParameterNames();

        i = 0;

        while (names.hasMoreElements()) {

            String nextElement = names.nextElement();

            System.out.print(++i + ":" + nextElement + ":");

            String initParameter = config2.getInitParameter(nextElement);

            System.out.println(initParameter);

        }

        RequestDispatcher dispatcher = req.getRequestDispatcher("test2.do");

        dispatcher.forward(req, resp);

    }

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException,

            IOException {

    }

}

xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

    id="WebApp_ID" version="3.0">

    <display-name>TestBootWeb</display-name>

    <servlet>

        <servlet-name>TestServlet</servlet-name>

        <servlet-class>com.stono.servlet.TestServlet</servlet-class>

        <init-param>

            <param-name>name</param-name>

            <param-value>123</param-value>

        </init-param>

    </servlet>

    <servlet>

        <servlet-name>TestServlet2</servlet-name>

        <servlet-class>com.stono.servlet.TestServlet2</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>TestServlet</servlet-name>

        <url-pattern>/test.do</url-pattern>

    </servlet-mapping>

    <servlet-mapping>

        <servlet-name>TestServlet2</servlet-name>

        <url-pattern>/test2.do</url-pattern>

    </servlet-mapping>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

        <welcome-file>index.htm</welcome-file>

        <welcome-file>index.jsp</welcome-file>

        <welcome-file>default.html</welcome-file>

        <welcome-file>default.htm</welcome-file>

        <welcome-file>default.jsp</welcome-file>

    </welcome-file-list>

</web-app>