Java文件操作问题总结

import java.io.File;
import java.io.IOException;

public class FileTest {
    public static void main(String[] args){
        String _separator = File.separator;
        String filename = "file.txt";
        String directory = "folder" + _separator + filename;
        File _file = new File(directory);

        String _can = _file.getName();
        System.out.println(_can);

        if(_file.exists()){
            //do someting

            System.out.println("file path：" + _file.getAbsolutePath());
            System.out.println("file size：" + _file.length());


        }else{// create file
            _file.getParentFile().mkdirs(); // ??? 创建父级所有存在与不存在的目录
            _file.getParentFile().mkdir();//仅仅创建当前的目录
            try {
                _file.createNewFile();
            }catch(IOException e){
                e.printStackTrace();
            }
        }

    }
}