java io流清空txt文件内容及填充文件内容

File file = new File(this.getClass().getResource("").getPath());System.out.println(file.getPath());String path=file.getPath();String filename="test1.txt";//path=path.substring(0,path.indexOf("WEB-INF"))+"upload\\Excel"+"\\"+"import.txt";  //服务器专用      username= DesUtil.encrypt(username);      password=DesUtil.encrypt(password);      ip=DesUtil.encrypt(ip);      DatabaseName=DesUtil.encrypt(DatabaseName);path=path.substring(0,path.indexOf("target"))+"src\\main\\webapp\\upload\\Excel"+"\\"+"import.txt";clearInfoForFile(path);try {      FileWriter fileWriter =new FileWriter(path, true);      String info="";      info=info+ip+"\n"+DatabaseName+"\n"+username+"\n"+password;      fileWriter.write(info);      fileWriter.flush();      fileWriter.close();}catch (IOException e){

}InputStream is = new FileInputStream(path);String line; // 用来保存每行读取的内容BufferedReader reader = new BufferedReader(new InputStreamReader(is));line = reader.readLine(); // 读取第一行int t=0;if (line==null){

}else {   t=1;}reader.close();is.close();

//清空文件内容public  void clearInfoForFile(String fileName) {   File file =new File(fileName);   try {      if(!file.exists()) {         file.createNewFile();      }      FileWriter fileWriter =new FileWriter(file);      fileWriter.write("");      fileWriter.flush();      fileWriter.close();   } catch (IOException e) {      e.printStackTrace();   }}

原文地址：https://www.cnblogs.com/dawn-and-night/p/11127188.html