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java - 带有 printwirter 参加方法的循环仅写入最后搜索的单词

问题描述

尽管使用了参加方法，Printwriter 仅将带有搜索词的最后一行写入文件，而不是每行带有搜索词的每一行。我认为我的代码有问题。任何人都可以检查代码并帮助我吗？

package JanKozak6;

import java.util.Scanner;
import java.io.*;
public class Main {

public static void main(String[] args) {
    Scanner scan1 = new Scanner(System.in);
    //System.out.println("Write a name of a File.txt you want to check in project home directory");
    //String nameOfFile = scan1.nextLine();
    try {

        FileReader read1 = new FileReader("FileToRead");
        BufferedReader read11 = new BufferedReader(read1);
        System.out.println("Give a word to find in text lines");
        String wordToFind = scan1.nextLine();
        System.out.println("wordToFind: " + wordToFind);
       if (read11.readLine() != null) {

            String FoundWord = read11.readLine();
            System.out.println("Read the line");
            while (FoundWord.contains(wordToFind)) {

                try {
                    System.out.println("Try to write");
                    FileWriter write1 = new FileWriter("FoundWords", true);
                    PrintWriter write11 = new PrintWriter(write1);
                    System.out.println("Writing...");
                    //write11.write(FoundWord);
                    write11.append(FoundWord);
                    System.out.println("Closing BuffereWriter");
                    write11.close();
                }
                catch (IOException ex) {
                    System.out.println("FoundWord have not been written");
                }
            }
        }
        read11.close();
    }
    catch (IOException ex)
    {
        System.out.println("Exception: The file is not found");
    }

}
}

标签： javawhile-loopfilewriterprintwriterfile-writing

解决方案

您没有循环读取文件。试试这个：

public static void main(String[] args) {
        Scanner scan1 = new Scanner(System.in);
        //System.out.println("Write a name of a File.txt you want to check in project home directory");
        //String nameOfFile = scan1.nextLine();
        try {

            FileReader read1 = new FileReader("FileToRead");
            BufferedReader read11 = new BufferedReader(read1);
            System.out.println("Give a word to find in text lines");
            String wordToFind = scan1.nextLine();
            String FoundWord=null;
            System.out.println("wordToFind: " + wordToFind);
            while((FoundWord=read11.readLine()) != null) {
                System.out.println("Read the line");
                if(FoundWord.contains(wordToFind)) {

                    try {
                        System.out.println("Try to write");
                        FileWriter write1 = new FileWriter("FoundWords", true);
                        PrintWriter write11 = new PrintWriter(write1);
                        System.out.println("Writing...");
                        //write11.write(FoundWord);
                        write11.append(FoundWord);
                        System.out.println("Closing BuffereWriter");
                        write11.close();
                    }
                    catch (IOException ex) {
                        System.out.println("FoundWord have not been written");
                    }
                }
            }
            read11.close();
        }
        catch (IOException ex)
        {
            System.out.println("Exception: The file is not found");
        }

    }
    }

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