删除文本中一段类容

Question

System.out.println(str.replaceAll("(?s)(--##begin).*?(--##end)","$1$2"));

Answer 1

        InputStreamReader read = null;
        try {
            FileWriter fw = new FileWriter("输出文件路径");
            read = new InputStreamReader(new FileInputStream(new File("输入文件路径")));
            BufferedReader br = new BufferedReader(read);
            String line = br.readLine();
            boolean deleted = false;
            while (line != null) {
                if (line.trim().equals("--##begin")) {
                    deleted = true;
                    fw.write("--##begin\r\n");
                } else if (line.trim().equals("--##end")) {
                    deleted = false;
                    fw.write("要插入的内容\r\n");
                    fw.write("--##end\r\n");
                } else if (!deleted) {
                    fw.write(line + "\r\n");
                }
                line = br.readLine();
            }
            br.close();
            read.close();
            fw.close();
        } catch (IOException ex) {
            ex.printStackTrace(System.err);
        }