如何删除文本文件中的特定字符串？

Question

Answer 1

找到该文件.

File file = new File("/path/to/file.txt");

创建一个临时文件(否则你首先要将所有内容都读入Java的内存).

File temp = File.createTempFile("file", ".txt", file.getParentFile());

确定字符集.

String charset = "UTF-8";

确定要删除的字符串.

String delete = "foo";

打开文件进行阅读.

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset));

打开临时文件进行写入.

PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(temp), charset));

逐行读取文件.

for (String line; (line = reader.readLine()) != null;) {
    // ...
}

从行中删除字符串.

    line = line.replace(delete, "");

将其写入临时文件.

    writer.println(line);

关闭阅读器和写入器(最好在finally块中).

reader.close();
writer.close();

删除文件.

file.delete();

重命名临时文件.

temp.renameTo(file);