Java FileWriter 跳过文件

发布于 2025-01-20 22:40:03 字数 703 浏览 0 评论 0原文

我有一个带有文件的软件包：“ 100.txt”，“ 1000.txt”，“ 10000.txt”，“ 100000.txt”，“ 1000000.txt”。但是，当我启动程序时，它会跳过100和1000个TXT文件。你能告诉我为什么吗？

public void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++){
            for (int j = 100; j <= 1000000; j*=10){
                FileWriter fileWriter = new FileWriter(path.resolve(Integer.toString(i)).resolve(j + ".txt").toFile());
                Random random = new Random();
                for (int k = 0; k < j; k++){
                    int num = random.nextInt(10);
                    fileWriter.write(num);
                    fileWriter.write("\n");
                }
            }
        }
    }

原文

I have a package with files : "100.txt" ,"1000.txt", "10000.txt","100000.txt", "1000000.txt".
But when i launch my program, it skips 100 and 1000 txt files. Can you tell me why?

public void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++){
            for (int j = 100; j <= 1000000; j*=10){
                FileWriter fileWriter = new FileWriter(path.resolve(Integer.toString(i)).resolve(j + ".txt").toFile());
                Random random = new Random();
                for (int k = 0; k < j; k++){
                    int num = random.nextInt(10);
                    fileWriter.write(num);
                    fileWriter.write("\n");
                }
            }
        }
    }

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夜无邪 2025-01-27 22:40:04

我运行了你的代码，一切似乎都运行得很好。

所有文件均已打印：

100.txt
1000.txt
10000.txt
100000.txt
1000000.txt

我注意到的一件事是，在完成后您不会关闭 FileWriter 。也许这就是问题所在。

这是我运行的完整代码。我确实删除了将文件写入编号目录的操作，因为这些目录在我的计算机上不存在。

package forloop;

import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Random;

public class GenerateData {

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

        Path path = Paths.get("");

        generateData(path);
    }

    public static void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++){
            for (int j = 100; j <= 1000000; j*=10){
                FileWriter fileWriter = new FileWriter(path.resolve(j + ".txt").toFile());
                Random random = new Random();
                for (int k = 0; k < j; k++){
                    int num = random.nextInt(10);
                    fileWriter.write(num);
                    fileWriter.write("\n");
                }
                fileWriter.close();
            }
        }
    }
}

根据安迪的建议，使用 try-with-resources 的解决方案。

package forloop;

import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Random;

public class GenerateData {

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

        Path path = Paths.get("");

        generateData(path);
    }

    public static void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++) {
            for (int j = 100; j <= 1000000; j*=10) {
                try (FileWriter fileWriter = new FileWriter(path.resolve(j + ".txt").toFile())) {
                    Random random = new Random();
                    for (int k = 0; k < j; k++){
                        int num = random.nextInt(10);
                        fileWriter.write(num);
                        fileWriter.write("\n");
                    }
                }
            }
        }
    }
}

I ran your code and everything seemed to run pretty well.

All files were printed:

100.txt
1000.txt
10000.txt
100000.txt
1000000.txt

One thing I noticed is that you don't close your FileWriter after you're done with it. Perhaps that is the problem.

Here is the full code I ran. I did remove the writing of the files into the numbered directories since those directories didn't exist on my machine.

package forloop;

import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Random;

public class GenerateData {

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

        Path path = Paths.get("");

        generateData(path);
    }

    public static void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++){
            for (int j = 100; j <= 1000000; j*=10){
                FileWriter fileWriter = new FileWriter(path.resolve(j + ".txt").toFile());
                Random random = new Random();
                for (int k = 0; k < j; k++){
                    int num = random.nextInt(10);
                    fileWriter.write(num);
                    fileWriter.write("\n");
                }
                fileWriter.close();
            }
        }
    }
}

Based on Andy's suggestion a solution that uses a try-with-resources.

package forloop;

import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Random;

public class GenerateData {

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

        Path path = Paths.get("");

        generateData(path);
    }

    public static void generateData(Path path) throws IOException {
        for (int i = 1; i <= 5; i++) {
            for (int j = 100; j <= 1000000; j*=10) {
                try (FileWriter fileWriter = new FileWriter(path.resolve(j + ".txt").toFile())) {
                    Random random = new Random();
                    for (int k = 0; k < j; k++){
                        int num = random.nextInt(10);
                        fileWriter.write(num);
                        fileWriter.write("\n");
                    }
                }
            }
        }
    }
}

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