使用Java IO流清空和填充txt文件内容

String info = "";

try {

info += ip + "

" + DatabaseName + "

" + username + "

" + 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();