Question

我想制作一个小型搜索引擎。考虑我有5个文本文件，我想在整个文件中找到“book”这个词。我该如何开始？我是一名大四学生，我有一些关于树和迭代器的信息，我必须使用这些概念。任何人都可以帮我提供代码吗？

Answer 1

您不需要任何有关树和迭代器的知识。这完全是关于递归调用，不再是。

这是纯Java代码，没有使用依赖项或框架：只需传递您想要在调用时搜索的目录或文件名和单词。

package com.mytests;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

public class Sometest {

public static void main(String[] args) {

    if (null == args || args.length < 2) {
        System.err.println("Not enough parameters. Please provide searchPath and searchWord.");
        return;
    }

    String pathToSearch = args[0];
    String wordToSearch = args[1];

    System.out.println("Start search word " + wordToSearch + " in " + pathToSearch);

    File searchFile = new File(pathToSearch);

    if (!searchFile.exists()) {
        System.err.println("Cannot find given file or directory to search :" + pathToSearch + ": ");
    }

    int matchesCount = 0;
    matchesCount = searchWord(searchFile, wordToSearch, matchesCount);

    System.out.println("Search completed. Matches found : " + matchesCount);

}

private static int searchWord(File sourceFile, String wordToSearch, int matchesCount) {

    int count = matchesCount;
    if (sourceFile.isDirectory()) {
        String[] sourceFilesArray = sourceFile.list();

        for (String nextFileName : sourceFilesArray) {
            File nextFile = new File(sourceFile.getAbsolutePath() + System.getProperty("file.separator")
                    + nextFileName);
            count = searchWord(nextFile, wordToSearch, count);
        }
    } else {
        try {
            BufferedReader sourceFileReader = new BufferedReader(new FileReader(sourceFile));
            String nextLine = "";
            while (true) {
                nextLine = sourceFileReader.readLine();
                if (null == nextLine) {
                    break;
                }

                if (nextLine.contains(wordToSearch)) {
                    System.out.println("found in -> " + sourceFile.getCanonicalPath());
                    count++;
                }

            }
            sourceFileReader.close();
        } catch (Exception e) {
            System.err.println("Error while reading file " + sourceFile.getAbsolutePath() + " : " + e.getMessage());
        }
    }

    return count;
}

}

我只是想知道什么是目的？个人教育？

如何在java中创建一个小型搜索引擎

1 个答案: