Java FileWriter跳过文件

Question

我有一个文件包：“100.txt”、“1000.txt”、“10000.txt”、“100000.txt”、“1000000.txt”。但当我启动程序时，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");
                }
            }
        }
    }

Answer 1

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：

• 一百。txt
• 一千。txt
• 一万。txt
• 十万。txt
• 一百万。txt

我注意到的一件事是，在完成文件编写器之后，您不会关闭它。也许这就是问题所在。

这是我运行的完整代码。我确实删除了对编号目录的写入，因为这些目录在我的机器上不存在。

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Andy的建议，我们提出了一个解决方案，该解决方案使用了各种资源进行尝试。

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");
                    }
                }
            }
        }
    }
}