我用java操作txt，需要在文本中记录用户名和密码，一行对应一个用户信息。
以下代码是注册部分，在servlet中每次注册都会重复的把信息添加到txt中，而类中就没问题，请问各位这是怎么回事，急啊。。。
java类的代码如下
- Java code
package com.feijoy.wap.tools;import java.io.*;public class Txt { public static BufferedReader bufread; //指定文件路径和名称 private static String path = "F:/AllUserInfo.txt"; private static File filename = new File(path); private static String readStr =""; /** * 创建文本文件. * @throws IOException * */ public static void creatTxtFile() throws IOException{ if (!filename.exists()) { filename.createNewFile(); } } /** * 删除文本文件. * @throws IOException * */ public static void deleteTxtFile() throws IOException{ if (filename.exists()) { filename.delete(); } } /** * 读取文本文件. * */ public static String readTxtFile(){ String read; FileReader fileread; try { fileread = new FileReader(filename); bufread = new BufferedReader(fileread); try { while ((read = bufread.readLine()) != null) { readStr = readStr + read+ "\r\n"; } } catch (IOException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } return readStr; } public static String readTxtInfo(){ String read; FileReader fileread; File filename = new File("F:/info.txt"); try { fileread = new FileReader(filename); bufread = new BufferedReader(fileread); try { while ((read = bufread.readLine()) != null) { readStr = readStr + read+ "\r\n"; } } catch (IOException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } return readStr; } /** * 写文件. * */ public static void writeTxtFile(String newStr) throws IOException{ //先读取原有文件内容，然后进行写入操作 String filein = newStr + "\r\n"; RandomAccessFile mm = null; try { mm = new RandomAccessFile(filename, "rw"); mm.writeBytes(filein); } catch (IOException e1) { e1.printStackTrace(); } finally { if (mm != null) { try { mm.close(); } catch (IOException e2) { e2.printStackTrace(); } } } } /** * main方法测试 * @param s * @throws IOException */ public static void main(String[] s) throws IOException { Txt.creatTxtFile(); String rstr = Txt.readTxtFile(); String str = rstr + "aaa,456"; Txt.writeTxtFile(str); }}servlet代码如下
- Java code
package com.feijoy.wap.servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import com.feijoy.wap.tools.Txt;public class RegServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); String regName = request.getParameter("r_name"); String regPwd = request.getParameter("r_pwd"); String info = ""; boolean flag = false; String allUserInfo = Txt.readTxtFile(); Txt.deleteTxtFile(); if(regName != null && regPwd != null){ if("".equals(regName) || "".equals(regPwd)){ info = "用户名或密码不能为空"; flag = false; }else{ String userInfo[] = allUserInfo.split("\n"); ArrayList al =new ArrayList(); for(int i=0;i<userInfo.length;i++){ String userName[] = userInfo[i].split(","); al.add(userName[0]); } for(int i=0;i<al.size();i++){ String uname = (String)al.get(i); if(regName.equals(uname)){ flag = false; info = "用户名重复，请重新输入用户名"; break; }else{ flag = true; } } } }else{ flag = false; info = "请正常访问"; } if(true){ //写入txt注册信息 System.out.println("----------------------------------"); System.out.println("原有用户信息 "+allUserInfo); String userInfo = regName + "," + regPwd; System.out.println("新用户信息 "+userInfo); String newInfo = allUserInfo + userInfo; Txt.creatTxtFile(); Txt.writeTxtFile(newInfo); info = "注册成功！"; request.setAttribute("message", info); request.getRequestDispatcher("/user/info.jsp").forward(request, response); }else{ //转到错误页面 request.setAttribute("message", info); request.getRequestDispatcher("/user/info.jsp").forward(request, response); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); }}