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1public 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());}