文件操作

文件创建

package com.edu.file;

import org.junit.jupiter.api.Test;

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

public class Demo01 {
    public static void main(String[] args) {

    }
    @Test
    //方式1
    public void create01(){
        String filePath = "D:\\new1.txt";
        File file = new File(filePath);
        try {
            file.createNewFile();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        System.out.println("创建成功");
    }
    @Test
    //方式二
    public void create02(){
        File file = new File("d:\\"); //父
        String fileName = "new2.txt";//子
        File file1 = new File(file,fileName);
        try {
            file1.createNewFile(); //真正创建
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @Test
    //方式三
    public void crete03(){
        String parentPath = "d:\\";
        String sonPath = "new3.txt";
        File file = new File(parentPath,sonPath);
        try {
            file.createNewFile();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        System.out.println("创建成功");
    }
}

获取文件信息
 

   //获取文件信息
    public void info(){
        //先创建文件对象
        File file = new File("d:\\new3.txt");
        //调用相应方法得到对应信息
        System.out.println("文件名字:"+file.getName());
        System.out.println("文件绝对路径"+file.getAbsolutePath());
        System.out.println("文件父目录"+file.getParent());
        System.out.println("文件大小"+file.length());
        System.out.println("文件是否存在"+file.exists());
        System.out.println("是不是一个文件"+file.isFile());
        System.out.println("是不是一个目录"+file.isDirectory());

    }