如何用Java将二进制文件写入文件 [英] How to write binary to a file in Java

问题描述

我正在尝试从文件获取输入，将字符转换为二进制，然后将二进制输出到另一个输出文件.

I am trying to get input from a file, convert the characters to binary and then output the binary to another output file.

我使用Integer.toBinaryString()进行转换.

I used Integer.toBinaryString() in order to make the conversion.

一切正常，但由于某种原因，没有任何内容写入输出文件，但是当我使用System.out.println()时，它可以正常输出.

Everything is working as it should but for some reason nothing is written to the output file, but when I use System.out.println() it outputs fine.

import java.io.*;

public class Binary {

    FileReader fRead = null;
    FileWriter fWrite = null;
    byte[] bFile = null;
    String fileIn;

    private String binaryString(int bString) {

        String binVal = Integer.toBinaryString(bString);

        while (binVal.length() < 8) {
            binVal = "0" + binVal;
        }

        return binVal;
    }

    public void input() throws IOException, UnsupportedEncodingException {
        try {
            fRead = new FileReader("in.txt");
            BufferedReader reader = new BufferedReader(fRead);

            fileIn = reader.readLine();
            bFile = fileIn.getBytes("UTF-8");

            fWrite = new FileWriter("out.txt");
            BufferedWriter writer = new BufferedWriter(fWrite);

            for (byte b: bFile) {
                writer.write(binaryString(b));
                System.out.println(binaryString(b));
            }
            System.out.println("Done.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public Binary() {

    }

    public static void main(String[] args) throws UnsupportedEncodingException, IOException {
        Binary b = new Binary();
        b.input();
    }

}

我知道我的代码不是很好，我对Java来说还比较陌生，所以我不知道其他许多方法可以实现这一目标.

I know my code is not very good, I'm relatively new to Java so I don't know many others ways to accomplish this.

推荐答案

使用输出流而不是Writer，因为不应该使用writer来编写二进制内容

Use Output stream instead of Writer as writer is not supposed to be used for writing binary content

FileOutputStream fos = new FileOutputStream(new File("output.txt"));
BufferedOutputStream bos = new BufferedOutputStream(fos);
bos.write(b); // in loop probably

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