在当前 .jar 文件夹中创建一个新文件

Question

I am trying to create a new file in the directory where the .jar file is located.

public static void main(String[] args) throws IOException {
    BufferedWriter br = new BufferedWriter(new FileWriter("./filename.txt"));
    br.write("abcdefg");
    br.close();
}

This is my code but it gives me error that the file/directory does not exist. But when creating a file like this within my IDE, it just creates a new file.

Answer 1

All you should need is this code below and it should work. I tested it both from my IDE and from a compiled JAR file.

public static void main(String[] args) {
    try {
        BufferedWriter writer = new BufferedWriter(new FileWriter("Test.txt"));
        writer.write("This is a test");
        writer.close();
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}