使用字節流寫入文件

Question

我正在嘗試使用字節流向文本文件中寫入一系列10000個隨機整數，但是一旦打開文本文件，它就會具有一個隨機字符集合，這些字符似乎與我想要的整數值無關所示。 我是這種流形式的新手，我猜想整數值被當作字節值使用，但是我想不出一種解決辦法。

我目前的嘗試...

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;


public class Question1ByteStream {
    public static void main(String[] args) throws IOException {

        FileOutputStream out = new FileOutputStream("ByteStream.txt");

        try {
            for(int i = 0; i < 10000; i ++){
                Integer randomNumber = randInt(0, 100000);
                int by = randomNumber.byteValue();
                out.write(by);
            }
        }finally{
            if (out != null) {
                out.close();
            }
        }
    }

    public static int randInt(int min, int max) {
        Random rand = new Random();
        int randomNum = rand.nextInt((max - min) + 1) + min;

        return randomNum;
    }
}

很抱歉，如果這不夠清楚。

Answer 1

It's because the numbers that you write are not written as strings into the txt but as raw byte value. 
Try the following code:

  BufferedWriter writer = null;
    try {
        writer = new BufferedWriter(new FileWriter("./output.txt"));
        writer.write(yourRandomNumberOfTypeInteger.toString());
    } catch (IOException e) {
        System.err.println(e);
    } finally {
        if (writer != null) {
            try {
                writer.close();
            } catch (IOException e) {
                System.err.println(e);
            }
        }
    }

Or, if referring to your original code, write the Integer directly:
try {
            for(int i = 0; i < 10000; i ++){
                Integer randomNumber = randInt(0, 100000);
                out.write(randomNumber.toString());
            }
        }finally{
            if (out != null) {
                out.close();
            }
        }

Answer 2

不要像下面那樣（以字節字符形式書寫）

 for(int i = 0; i < 10000; i ++){
                Integer randomNumber = randInt(0, 100000);
                int by = randomNumber.byteValue();
                out.write(by);
}

因為它是文本文件，所以以字符串形式編寫

 for(int i = 0; i < 10000; i ++){
                Integer randomNumber = randInt(0, 100000);

                out.write(randomNumber);
}

自動為整數對象randomNumber調用toString()方法，並將其寫入文件。