<Meta http-equiv="pragma" content="no-cache"> <Meta http-equiv="cache-control" content="no-cache"> <Meta http-equiv="expires" content="0"> <Meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <Meta http-equiv="description" content="This is my page"> this is a test page.

<%@page import="java.io.*"%> <% String path="/opt/test.txt"; writeNumber(String.valueOf(readNumber(path)+1),path); %> <%=readNumber(path) %> <%! /** * 写入数字内容 * * @param number * @param filename * @return */ public boolean writeNumber(String number,String filename) { try { FileOutputStream fos = new FileOutputStream(filename); OutputStreamWriter writer = new OutputStreamWriter(fos); writer.write(number); writer.close(); fos.close(); } catch (IOException e) { e.printStackTrace(); return false; } return true; } /** * 读取数字内容 * * @param filename * @return */ public int readNumber(String filename) { int number = 0; try { File file = new File(filename); if (file.exists()) { FileReader fr = new FileReader(file); BufferedReader br = new BufferedReader(fr); String contents = br.readLine(); if (contents != null && contents.length() > 0) { contents = contents.replaceAll("[^0-9]",""); number = Integer.valueOf(contents); } br.close(); fr.close(); } } catch (IOException e) { e.printStackTrace(); } return number; } %>