使用命令行参数时无法写入文件

Question

当我不输入命令行参数时，我可以写入文件，但无论何时我输入命令行参数，它都不会写入。即使我什至没有使用命令行参数。

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;



public class Test {

    public Test () throws IOException {

        String content = "writing...";

        File file = new File("sample.txt");

        if (!file.exists()) {
            file.createNewFile();
        }

        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(content);
        bw.close();

        System.out.println("Done");

    }
}

Answer 1

您需要 flush 从 RAM 到 HDD|SSD 的数据，所以：

try (FileWriter fw = new FileWriter(file.getAbsoluteFile()); BufferedWriter bw = new BufferedWriter(fw)) {
      // Write the data to the memory
      bw.write(content);
      // You need to flush the data
      bw.flush();
      // Close the BufferedWriter
      bw.close();
} catch (Exception ex) {
      Logger.getLogger(getClass().getName()).log(Level.SEVERE, "Failed to write the data on the file", ex);
}

使用命令行参数时无法写入文件

Can't write to file while using command line arguments

java

command-line

arguments

bufferedwriter