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();
 }
}