学步园

/**
* 传统方式
*/
private void test1() throws FileNotFoundException, IOException {
		// FileInputStream in = new FileInputStream("src/test.properties"); // 错误写法1  java项目中这么写是正确的
		 //  FileInputStream in = new FileInputStream("classes/test.properties");//错误写法2
		     FileInputStream in = new FileInputStream("test.properties");//把test.properties文件copy到tomcate的bin目录下
		     Properties prop = new Properties();
		     prop.load(in);
		     String driver = prop.getProperty("driver");
		     String url = prop.getProperty("url");
		     System.out.println("driver-==-="+driver);
		     System.out.println("url-==-="+url);
	}

private void test2() throws IOException {
		System.out.println("test2");
		InputStream in = this.getServletContext().getResourceAsStream("WEB-INF/classes/test.properties");
		 Properties prop = new Properties();
		 prop.load(in);
		 String driver = prop.getProperty("driver");
		 String url = prop.getProperty("url");
		 System.out.println("driver-==-="+driver);
		 System.out.println("url-==-="+url);
	}

private void test3() throws FileNotFoundException, IOException {
		String path = this.getServletContext().getRealPath("WEB-INF/classes/test.properties");//拿到资源在硬盘上的路径
		FileInputStream in = new FileInputStream(path);
		 System.out.println("test3");
		 Properties prop = new Properties();
		 prop.load(in);
		 String driver = prop.getProperty("driver");
		 String url = prop.getProperty("url");
		 System.out.println("driver-==-="+driver);
		 System.out.println("url-==-="+url);
	}

private void test4() throws IOException {
		/**
		 * 读取webroot目录下的配置文件
		 */
		 System.out.println("test4");
		 InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/test11.properties");
		 Properties prop = new Properties();
		 prop.load(in);
		 String driver = prop.getProperty("driver");
		 String url = prop.getProperty("url");
		 System.out.println("driver-==-="+driver);
		 System.out.println("url-==-="+url);
	}

private void test5() throws IOException {
		/**
		 * 类装载器方式读取，我常用的方式
		 */
		InputStream in  = readProp.class.getClassLoader().getResourceAsStream("test.properties");
		System.out.println("类装载器方式");
		 Properties prop = new Properties();
		 prop.load(in);
		 String driver = prop.getProperty("driver");
		 String url = prop.getProperty("url");
		 System.out.println("driver-==-="+driver);
		 System.out.println("url-==-="+url);
	}