如何在java中将转换为字节数组的文本文件内容写入另一个文件

Question

我将文本文件内容转换为字节数组。我想将其重写为另一个文本文件，但 BufferedWriter 将其全部写入一行，我该如何解决？我希望它和原来的完全一样

这就是我的做法：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;

public class StringToBinary_Converter {
    public static ArrayList<byte[]> al = new ArrayList<byte[]>();

    public static void main(String[] args) {
        try {

            BufferedReader br = new BufferedReader(new FileReader(new File("A.txt")));
            String input;
            while ((input = br.readLine()) != null) {
                al.add(input.getBytes());

            }

            PrintStream ps = new PrintStream("B.txt");
            System.setOut(ps);

            for (int i = 0; i < al.size(); i++) {
                for (int j = 0; j < al.get(i).length; j++) {
                    System.out.println(al.get(i)[j]);
                }
            }

            for (int i = 0; i < al.size(); i++) {
                for (int j = 0; j < al.get(i).length; j++) {

    System.out.println(Integer.toBinaryString(Integer.parseInt(String.valueOf(al.get(i)[j]))));
                }
            }

            for (int i = 0; i < al.size(); i++) {
                for (int j = 0; j < al.get(i).length; j++) {

    System.out.println(Integer.toHexString(Integer.parseInt(String.valueOf(al.get(i)[j]))));
                }
            }

            try (BufferedWriter bw = new BufferedWriter(new FileWriter("C.txt"));) {
                for (int i = 0; i < al.size(); i++) {
                    bw.write(new String(al.get(i), StandardCharsets.UTF_8));
                }

            } catch (IOException e) {
                e.getMessage();
            }

        } catch (IOException e) {
            e.getMessage();
        }

    }

}

我正在使用 Eclipse，提前致谢。

*编辑 我知道将文件内容写入另一个文件不需要转换。

Answer 1

解决这个问题：

        while ((input = br.readLine()) != null) {
            al.add(input.getBytes());
            al.add('\n');

        }

你正在逐行阅读，所以新行丢失了，你需要重新添加。

这将完成所有工作：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;

public class StringToBinary_Converter{
    public static ArrayList<byte[]> al = new ArrayList<byte[]>();

    public static void main(String[] args) {
        try {

            BufferedReader br = new BufferedReader(new FileReader(new File("A.txt")));
            String input;
            while ((input = br.readLine()) != null) {
                al.add(input.getBytes());
            }

            PrintStream ps = new PrintStream("B.txt");
            System.setOut(ps);

            for (int i = 0; i < al.size(); i++) {
                String line = new String(al.get(i));
                for (int j = 0; j < al.get(i).length; j++) {
                    System.out.print((char)al.get(i)[j]);
                }
                System.out.println();
            }
        } catch (IOException e) {
            e.getMessage();
        }

    }

}