Java FileWriter跳过文件

Question

我有一个包含文件的包："100.txt“、"1000.txt”、"10000.txt“、"100000.txt”、"1000000.txt“。但是当我启动我的程序时，它会跳过100和1000 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，一切都运行得很好。

所有文件均已打印：

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

有一件事我注意到，你没有关闭你的FileWriter后，你完成了它。也许这就是问题所在。

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

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();
            }
        }
    }
}

基于安迪的建议，一种使用资源试用的解决方案。

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");
                    }
                }
            }
        }
    }
}