使用servletContext读取资源文件

System.out.println(in);

//获取web资源的绝对路径
String path = this.getServletContext().getRealPath("/WEB-INF/classes/db.properties");
FileInputStream in = new FileInputStream(path);

Properties prop = new Properties();
prop.load(in);

String driver = prop.getProperty("driver");
String url = prop.getProperty("url");
String username = prop.getProperty("username");
String password = prop.getProperty("password");

//读取web工程中资源文件

InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/db.properties");
Properties prop = new Properties();
prop.load(in);

String driver = prop.getProperty("driver");
String url = prop.getProperty("url");
String username = prop.getProperty("username");
String password = prop.getProperty("password");