Question

我正在创建一个程序，旨在接收 n 分割数量并将文件拆分为该数量的子文件。在我的 SplitFile.java 中，我正在读取一个文件，传递一个子串数组，显示应该在每个拆分文件中的文本。然后我将字符串转换为字节数组并将字节数组写入拆分文件，但我正在创建的每个文件都输出只是略有不同的内容。

SplitFile.java

import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;

public class SplitFile 
{
    int numberOfSplits = 1;
    File file;
    String[] parts = new String[5];

    public SplitFile(File file,int numberOfSplits)
    {
        this.file = file;
        this.numberOfSplits = numberOfSplits;
    }

    public void FileSplitter() throws IOException
    {
        FileInputStream fis = new FileInputStream(file);
        String fileText = readFile();

        if(numberOfSplits == 2)
        {
            int mid = fileText.length() / 2;

            parts[0] = fileText.substring(0, mid);
            parts[1] = fileText.substring(mid);
        }
        else if(numberOfSplits == 3)
        {
            int third = fileText.length() / 3;
            int secondThird = third + third;

            parts[0] = fileText.substring(0, third);
            parts[1] = fileText.substring(third, secondThird);
            parts[2] = fileText.substring(secondThird);
        }

        for(int i = 1; i <= numberOfSplits; i++)
        {
            BufferedInputStream bis = new BufferedInputStream(new fileInputStream(file));
            FileOutputStream out;
            String name = file.getName();

            byte[] b = parts[i - 1].getBytes(Charset.forName("UTF-8"));
            int temp = 0;

            while((temp = bis.read(b)) > 0);
            {
                File newFile = new File(name + " " + i + ".txt");
                newFile.createNewFile();
                out = new FileOutputStream(newFile);
                out.write(b, 0, temp); // Writes to the file
                out.close();
                temp = 0;
            }

        }

    }

    public String readFile() throws IOException
    {
        BufferedReader br = new BufferedReader(new FileReader(file));

        try 
        {
            StringBuilder sb = new StringBuilder();
            String line = br.readLine();

            while (line != null) 
            {
                sb.append(line);
                sb.append("\n");
                line = br.readLine();
            }

            return sb.toString();
        }
        finally 
        {
            br.close();
        }
    }
}

如果我传入2作为我想要的分割量，它不会在中间分割，文件1是前半部分，文件2是后半部分，而是给出文本文件的结尾两个文件。我的问题似乎在这里：

while((temp = bis.read(b)) > 0);
{
    File newFile = new File(name + " " + i + ".txt");
    newFile.createNewFile();
    out = new FileOutputStream(newFile);
    out.write(b, 0, temp); // Writes to the file
    out.close();
    temp = 0;
}

我将在此处使用的示例文件是此文件：

MYFILE.TXT

ABCDEFGHIJKLMNOPQRSTUVWXYZ

它分为两个文件，如下所示：

myFile.txt 1

nopqrstuvqxyz

myFile.txt 2

opqrstuvqxyz

对问题是什么有任何想法？

Answer 1

在您的代码中，您在whilte循环中定义File newFile = new File(name + " " + i + ".txt");和out = new FileOutputStream(newFile);，这是不正确的。
while((temp = bis.read(b)) > 0);这里没有分号=。=“

您的代码中有很多错误我将更改您的代码，如：

        File newFile = new File(name + " " + i + ".txt");
        newFile.createNewFile();
        out = new FileOutputStream(newFile);
        out.write(b); // Writes to the file
        out.flush();
        out.close();

如果您需要运行所需的代码，请

        for (int i = 1; i <= numberOfSplits; i++) {
            String name = file.getName();
            byte[] b = parts[i - 1].getBytes(Charset.forName("UTF-8"));
            ByteArrayInputStream bis = new ByteArrayInputStream(b);

            int temp = 0;
            File newFile = new File(name + " " + i + ".txt");
            newFile.createNewFile();
            FileOutputStream out = new FileOutputStream(newFile);                    
            while ((temp = bis.read()) > 0)
            {
                out.write(temp); // Writes to the file
            }
            out.flush();
            out.close();
        }

字节数组无法正确打印到文件

1 个答案: