Question

此程序旨在查看位于特定文件夹中的两个文件，然后合并这两个文件并创建第三个文件。从第三个合并文件开始，它会搜索一个关键字，例如＆＃34; test＆＃34;，一旦找到关键字，它就会打印出关键字的位置和关键字。发生的事情是当我运行程序时它在第一次找到关键字后停止但它不会继续搜索该行。因此，如果有多个关键字＆＃39; test＆＃39;在该行中，它只会找到第一个并吐出位置和线。我希望它能打印两个或多个关键字。我认为这是因为导致问题的IndexOf逻辑。

import com.sun.deploy.util.StringUtils;

import java.io.*;
import java.lang.*;
import java.util.Scanner;

public class Concatenate {
    public static void main(String[] args) {
        String sourceFile1Path = "C:/Users/me/Desktop/test1.txt";
        String sourceFile2Path = "C:/Users/me/Desktop/test2.txt";

        String mergedFilePath = "C:/Users/me/Desktop/merged.txt";

        File[] files = new File[2];
        files[0] = new File(sourceFile1Path);
        files[1] = new File(sourceFile2Path);

        File mergedFile = new File(mergedFilePath);

        mergeFiles(files, mergedFile);
        stringSearch(args);
    }

    private static void mergeFiles(File[] files, File mergedFile) {

        FileWriter fstream = null;
        BufferedWriter out = null;
        try {
            fstream = new FileWriter(mergedFile, true);
            out = new BufferedWriter(fstream);
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        for (File f : files) {
            System.out.println("merging: " + f.getName());
            FileInputStream fis;
            try {
                fis = new FileInputStream(f);
                BufferedReader in = new BufferedReader(new InputStreamReader(fis));

                String aLine;
                while ((aLine = in.readLine()) != null) {
                    out.write(aLine);
                    out.newLine();
                }

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

        try {
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private static void stringSearch(String args[]) {
        try {
            String stringSearch = "test";
            BufferedReader bf = new BufferedReader(new FileReader("C:/Users/me/Desktop/merged.txt"));

            int linecount = 0;
            String line;

            System.out.println("Searching for " + stringSearch + " in file");

            while (( line = bf.readLine()) != null){
                linecount++;
                int indexfound = line.indexOf(stringSearch);


                if (indexfound > -1) {

                    System.out.println(stringSearch + " was found at position " + indexfound + " on line " + linecount);
                    System.out.println(line);

                }

            }

            bf.close();
        }
        catch (IOException e) {
            System.out.println("IO Error Occurred: " + e.toString());
        }


    }

}

Answer 1

这是因为你在while循环中每行搜索一次单词。循环的每次迭代都会将您带到文件的下一行，因为您正在调用bf.readLine（）。尝试以下内容。你可能需要调整它，但这应该让你接近。

        while (( line = bf.readLine()) != null){
            linecount++;

            int indexfound = line.indexOf(stringSearch);

            while(indexfound > -1)
            {
                System.out.println(stringSearch + " was found at position " + indexfound + " on line " + linecount);
                System.out.println(line);
                indexfound = line.indexOf(stringSearch, indexfound);
            }
        }

调试文件搜索/合并代码

1 个答案: