package com.itheima.servlet.cfg;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Properties;

import java.util.ResourceBundle;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoaderCfgServletDemo1 extends HttpServlet {

	//第一种方式,可以加载所有目录下的内容,但只用于web项目

	//test11();

	//test12();//ppp

	//test13();

	//第二种方式  ResouceBundle专门用于读取properties文件的，

    //只用于加载类路径classes目录下的文件

	//java项目和web项目都可以用

	//test21();

	//test22();//基名  ppp

	//第三种方式  就是用ClassLoader类加载器

	//得到类加载器的方法   LoaderCfgServletDemo1.class.getClassLoader()

	//类加载器一上来定位的目录是classes

	//test31();

	//test32();

	//test33();

	//曾经的回顾

	//test34();

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

		//test11();

		//test12();

		//test13();

		//test21();

		//test22();

		//test31();

		//test32();

		//test33();

		//test34();

	}

	 //pp

	public  void test34() throws IOException, FileNotFoundException {

		ClassLoader cl = LoaderCfgServletDemo1.class.getClassLoader();

		URL url  = cl.getResource("cfg.properties");//协议+主机名(包含端口)+资源地址

		//System.out.println(url.getPath());

		Properties p = new Properties();

		p.load(new FileInputStream(url.getPath()));

		System.out.println(p.getProperty("p"));

	}

   //pppp

	public  void test33() throws IOException, FileNotFoundException {

		ClassLoader cl = LoaderCfgServletDemo1.class.getClassLoader();

		//这是相对于classes这个目录而言，找它的上一级

		InputStream is = cl.getResourceAsStream("../cfg.properties");

		Properties p = new Properties();

		p.load(is);

		System.out.println(p.getProperty("p"));

	}

	//pp

	public  void test32() throws IOException, FileNotFoundException {

		ClassLoader cl = LoaderCfgServletDemo1.class.getClassLoader();

		InputStream is = cl.getResourceAsStream("cfg.properties");//如何写路径

		Properties p = new Properties();

		p.load(is);

		System.out.println(p.getProperty("p"));

	}

	//ppp

	public  void test31() throws IOException, FileNotFoundException {

		ClassLoader cl = LoaderCfgServletDemo1.class.getClassLoader();

		InputStream is = cl.getResourceAsStream("com/itheima/servlet/cfg/cfg.properties");//如何写路径

		Properties p = new Properties();

		p.load(is);

		System.out.println(p.getProperty("p"));

	}

	//ppp

	public  void test22() throws IOException, FileNotFoundException {

		ResourceBundle rb = ResourceBundle.getBundle("com.itheima.servlet.cfg.cfg");//基名(包名.文件名（不带扩展名）)

		System.out.println(rb.getString("p"));

	}

	//pp

	public  void test21() throws IOException, FileNotFoundException {

		ResourceBundle rb = ResourceBundle.getBundle("cfg");//基名

		System.out.println(rb.getString("p"));

	}

	public  void test13() throws IOException, FileNotFoundException {

		//1第一种  ,用/代表当前应用  pppp

		String path =getServletContext().getRealPath("/WEB-INF/cfg.properties");

		//System.out.println(path);

		Properties p  = new Properties();

		p.load(new FileInputStream(path));

		System.out.println(p.getProperty("p"));

	}

	public  void test12() throws IOException, FileNotFoundException {

		//1第一种  ,用/代表当前应用  ppp

		String path =getServletContext().getRealPath("/WEB-INF/classes/com/itheima/servlet/cfg/cfg.properties");

		//System.out.println(path);

		Properties p  = new Properties();

		p.load(new FileInputStream(path));

		System.out.println(p.getProperty("p"));

	}

	private void test11() throws IOException, FileNotFoundException {

		//1第一种  ,用/代表当前应用  pp

		String path =getServletContext().getRealPath("/WEB-INF/classes/cfg.properties");

		//System.out.println(path);

		Properties p  = new Properties();

		p.load(new FileInputStream(path));

		System.out.println(p.getProperty("p"));

	}

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

		this.doGet(request, response);

	}

}