public class ReadfileServlet extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		// 1.txt没有发布，所以不能访问		 String filename3 = "/3.txt";		 filename3 = this.getServletContext().getRealPath(filename3);		 String filename2 = "/WEB-INF/classes/2.txt";		 filename2 = this.getServletContext().getRealPath(filename2);		String filename1 = "/WEB-INF/4.txt";		filename1 = this.getServletContext().getRealPath(filename1);		try {			readfile(filename1);		} catch (Exception e) {			e.printStackTrace();		}	}	public static void readfile(String filename) throws Exception {		FileInputStream fs = new FileInputStream(filename);		byte[] b = new byte[1024];		int a;		while ((a = fs.read(b)) != -1) {			String str = new String(b, 0, a);			System.out.println(str);		}		fs.close();	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doGet(request, response);	}}