读取文本文件时跳过一定数量的行 - BufferedReader Java

Question

我在一个目录中有几个文件，我打算跳过一定数量的行。跳过行的唯一方法是获取字符长度为 1 的行的第一次出现。唯一可用的信息是该行出现在行号 60 之前的任何位置。所以我编写了以下方法来尝试跳过字符前的行。但我最终得到了与原始文件相同的文件：

public static void editSplitFiles(File sourceDir) {
    FilenameFilter only = new OnlyExt("RPT");
    log.debug("Editing Split Files........");
    String[] filenames = sourceDir.list(only);
    try {
        for (int k = 0; k < filenames.length; k++) {
            FileInputStream fs = new FileInputStream(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + filenames[k]);
            BufferedReader br = new BufferedReader(new InputStreamReader(fs));
            FileOutputStream fos = new FileOutputStream(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + filenames[k] + ".LST");
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
            String strLine;
            int num = 0;
            int splitLine = 0;
            while ((strLine = br.readLine()) != null) {
                num++;
                if (strLine.length() == 1) {
                    splitLine = num;
                }

                bw.write(strLine);
                bw.newLine();
                bw.flush();
            }
            if (splitLine < 60) {
                log.debug("File Name" + filenames[k] + "Line Number - " + splitLine);//This gives me the correct line number where the character is for each file.
                br.readLine();
            }

            fs.close();
            br.close();
            fos.close();
            bw.close();
        }
    } catch (Exception asd) {
        log.debug(asd.getMessage());
    }
}

我不确定我做错了什么，但看起来文件在我跳过之前就已经写入了。我该如何实现？

编辑这些文件如下所示：

Answer 1

我已经通过存储行来解决这个问题，以跳过地图中每个文件的值。然后遍历映射并跳过每个文件的行数。我认为应该有一个简单的方法。

public static Map getSplitMap(File sourceDir) {
        FilenameFilter only = new OnlyExt("RPT");
        log.debug("Getting split Map........");
        Map<String, Integer> map = new HashMap();
        String[] filenames = sourceDir.list(only);
        try {
            for (int k = 0; k < filenames.length; k++) {
                FileInputStream fs = new FileInputStream(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + filenames[k]);
                BufferedReader br = new BufferedReader(new InputStreamReader(fs));

                String strLine;
                int num = 0;
                int splitLine = 0;
                while ((strLine = br.readLine()) != null) {
                    num++;
                    if (strLine.length() == 1) {
                        splitLine = num;

                    }
                    if (splitLine < 60) {
                        map.put(filenames[k], splitLine);
                    }
                }

                fs.close();
                br.close();
            }
        } catch (Exception asd) {
            log.debug(asd.getMessage());
        }
        return map;
    }

然后跳过每个文件的行：

 public static void splitFile(File sourceDir) {
        Map<String, Integer> map = getSplitMap(sourceDir);
        try {
            for (Map.Entry<String, Integer> entry : map.entrySet()) {
                FileInputStream fs = new FileInputStream(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + entry.getKey());
                BufferedReader br = new BufferedReader(new InputStreamReader(fs));
                FileOutputStream fos = new FileOutputStream(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + entry.getKey() + ".LST");
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
                for (int i = 1; i < entry.getValue(); i++) {
                    br.readLine();
                }
                String strLine;
                while ((strLine = br.readLine()) != null) {
                    bw.write(strLine);
                    bw.newLine();
                    bw.flush();
                }
                fs.close();
                br.close();
                fos.close();
                bw.close();
                File files = new File(sourceDir.getAbsolutePath() + System.getProperty("file.separator") + entry.getKey());
                files.delete();
            }
        } catch (Exception asd) {
            log.debug(asd.getMessage());
        }
    }

读取文本文件时跳过一定数量的行 - BufferedReader Java

Skip certain number of lines while reading a text file - BufferedReader Java

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