Question

首先，我正在寻找问题的答案，但我找不到确切的答案。所以我在不同的文件夹和子文件夹中有许多.log文件（文本文档）。我在不同的文件夹中有很多很多.log文件。如果它们是三个关键字之一，则我希望完整的行符合以下条件：一个单独的文本文档：

我想查看.log文件中该行的行号
我想看线的路径

我知道我的代码尚未完成，但是我不知道如何继续。

如果我运行代码，我会看到字母之间总是空白。为什么？

感谢所有有用的答案！

public static void main(String[] args) {

    // declare folder
    File folder = new File("path");

    if (!folder.exists()) {
        System.out.println("folder not existing");
    }
    listAllFilesForFolder(folder);
}

public static void listAllFilesForFolder(File folder) {
    // for each file in folder
    for (File fileEntry : folder.listFiles()) {
        // if file is another folder
        if (fileEntry.isDirectory()) {
            // step into that folder recursively
            listAllFilesForFolder(fileEntry);
        } else {
            // its a file
            String filePath = fileEntry.getAbsolutePath();
            System.out.println("File is: " + filePath);
            parseFile(filePath);
        }
    }
}

public static void parseFile(String file) {
    BufferedReader reader;
    try {

        int LineCount = 0;
        // String line1 = "";

        reader = new BufferedReader(new FileReader(file));
        File folderError = new File("ErrorFolder");
        PrintWriter out = new PrintWriter("filename1.txt");
        // for each line in file
        String line = reader.readLine();
        while (line != null) {

            folderError.mkdir(); // create a folder in your current work space

            LineCount++;

            // print line
            System.out.println("line is: " + LineCount + " " + line);
            // TODO if line has an error, ... do something
            // read next line
            line = reader.readLine();

            out.println(line);
        }
        out.close();

        reader.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

Answer 1

如果您使用org.apache.commons.io.FileUtils进行以下操作：

package com.test;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;

import java.io.BufferedReader;
import java.io.File;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.List;


public class SearchInFilesAndDirectory {

    private static int lineNumber = 0;

    private static final String FOLDER_PATH = "path_to_file";

    public static void main(String[] args) {

        File dir = new File(FOLDER_PATH);

        List<File> files = (List<File>) FileUtils.listFiles(dir, TrueFileFilter.INSTANCE, DirectoryFileFilter.DIRECTORY);

        for (File file : files) {

            if (file.isFile()) {

                try (BufferedReader br = Files.newBufferedReader(file.toPath(), StandardCharsets.UTF_8)) {

                    String line;
                    while ((line = br.readLine()) != null) {
                        lineNumber++;
                        if (line.contains("word")) {
                            System.out.println("Keyword found in " + file.toPath() + " at line " + lineNumber + ".\n" + line.trim());
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

上面将打印出路径和行号，即

Keyword found in /path/test/childFolder/test.txt at line 3.
3       Keyword test
Keyword found in /path/test/testFile.txt at line 5.
1       keyword ----

如何提取包含特殊关键字的行并将行打印到单独的文本文件？

1 个答案: