1. import java.io.BufferedReader;
  2. import java.io.FileReader;
  3. import java.io.IOException;
  4. import java.util.ArrayList;
  5. import java.util.List;
  6. import java.util.Scanner;
  8. public class LogFilter {
  10. public static void main(String[] args) {
  11. Scanner scanner = new Scanner(System.in);
  13. String logFilePath = "";
  14. String filterString = "";
  16. // Get log file path from user
  17. System.out.print("Enter log file path: ");
  18. logFilePath = scanner.nextLine();
  20. // Get filter string from user
  21. System.out.print("Enter filter string: ");
  22. filterString = scanner.nextLine();
  24. try {
  25. List<String> filteredLines = filterLogFile(logFilePath, filterString);
  27. // Print filtered lines
  28. if (filteredLines.isEmpty()) {
  29. System.out.println("No matching lines found.");
  30. } else {
  31. for (String line : filteredLines) {
  32. System.out.println(line);
  33. }
  34. }
  35. } catch (IOException e) {
  36. System.err.println("Error reading log file: " + e.getMessage());
  37. } finally {
  38. scanner.close();
  39. }
  40. }
  43. /**
  44. * Filters log file lines based on a given filter string.
  45. * @param logFilePath The path to the log file.
  46. * @param filterString The string to filter the log lines by.
  47. * @return A list of filtered log lines.
  48. * @throws IOException If an error occurs while reading the log file.
  49. */
  50. public static List<String> filterLogFile(String logFilePath, String filterString) throws IOException {
  51. List<String> filteredLines = new ArrayList<>();
  53. try (BufferedReader reader = new BufferedReader(new FileReader(logFilePath))) {
  54. String line;
  55. while ((line = reader.readLine()) != null) {
  56. if (line.contains(filterString)) {
  57. filteredLines.add(line);
  58. }
  59. }
  60. } catch (IOException e) {
  61. throw e;
  62. }
  64. return filteredLines;
  65. }
  66. }

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