自学Servlet_2_servletContext(2)
读取配置文件的各种方法：方法一：
ServletContext context = this.getServletContext();InputStream in = context.getResourceAsStream("/db.properties");Properties prop = new Properties();//mapprop.load(in);String url = prop.getProperty("url");String username = prop.getProperty("username");String password = prop.getProperty("password");System.out.println(url);System.out.println(username);System.out.println(password);
方法二：
ServletContext context = this.getServletContext();String realpath = context.getRealPath("/db.properties");//c:\\sdsfd\sdf\db.properties//获取到操作文件名 realpath=abc.propertiesString filename = realpath.substring(realpath.lastIndexOf("\\")+1);System.out.println("当前读到的文件是：" + filename);FileInputStream in = new FileInputStream(realpath);Properties prop = new Properties();prop.load(in);String url = prop.getProperty("url");String username = prop.getProperty("username");String password = prop.getProperty("password");System.out.println("文件中有如下数据：");System.out.println(url);System.out.println(username);System.out.println(password);
方法三：
ServletContext context = this.getServletContext();URL url = context.getResource("/resource/db.properties");InputStream in = url.openStream();
方法四：InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/db.properties");Properties prop = new Properties();//mapprop.load(in);String url = prop.getProperty("url");String username = prop.getProperty("username");String password = prop.getProperty("password");System.out.println(url);System.out.println(username);System.out.println(password);
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