如何将文件写入 java 中的特定文件夹？

Question

我做了这个程序，它使用机器人 class 和 bufferedimage class 截取屏幕截图。包含屏幕截图的 .png 文件正在保存到 .java 文件所在的文件夹 present.I 希望将图像文件写入我创建的另一个名为 screenshot 的文件夹中。我尝试重命名文件，也尝试使用输入流和输出流 classes 进行复制，但结果相同。我怎么能克服这个？我使用 windows 8 和 java 1.8.0

package screenshot;

//Packages imported for the program

import java.io.*;
import java.nio.file.*;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import java.util.*;
import java.text.*;

//Class logic written beside each statement

public class Screenshot 
{

   public static void main(String[] args) 
   {       

     try                                                                                    
     {                                                //Exception Handling
        SimpleDateFormat df=new SimpleDateFormat("dd-MM-yy H-m'.png'");                   //Setting the date format 
        Date date=new Date();                                                             //Getting the current date and time
        String ref=df.format(date);                                                       //Formatting the current date in the SDF constructor's format
        //String dirname="M:\Java\bin\screenshot\";
        System.out.println(ref);                                                          //Testing whether the current date is getting displayed in the desired format
        Robot robot = new Robot();                                                        //Instanciating the Robot class       
        Rectangle captureSize = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());          //Declaring a rectangle with size of the screen
        BufferedImage bufferedImage = robot.createScreenCapture(captureSize);                        //Capturing the screenshot and save it in Buffered image object
        //File dir = new File(dirname);
        //File filen = new File("M:\Java\bin\screenshot\temp.png");
        File filename = new File(ref);
        ImageIO.write(bufferedImage, "png" , filename); //writing the image to a file called filename

     }
    catch(Exception e) 
    {
       System.err.println(e);  //Exception message display
    }
   }

}

Answer 1

将文件存储到文件夹 screenshot，更改变量

String ref=df.format(date);

至

String ref = "absolute_path_of_folder/" + df.format(date); // like "C:/screenshot/" + df.format(date);

它将文件保存到该文件夹。

Answer 2

你试过这个吗？请注意，我使用 File 的双参数构造函数，它采用 File 表示目录，以及该目录中文件的名称。我取消了您描述要保存到哪个目录的行的注释，并使用了该目录。

    SimpleDateFormat df=new SimpleDateFormat("dd-MM-yy H-m'.png'");                   //Setting the date format 
    Date date=new Date();                                                             //Getting the current date and time
    String ref=df.format(date);                                                       //Formatting the current date in the SDF constructor's format
    String dirname="M:\Java\bin\screenshot\";
    System.out.println(ref);                                                          //Testing whether the current date is getting displayed in the desired format
    Robot robot = new Robot();                                                        //Instanciating the Robot class       
    Rectangle captureSize = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());          //Declaring a rectangle with size of the screen
    BufferedImage bufferedImage = robot.createScreenCapture(captureSize);                        //Capturing the screenshot and save it in Buffered image object
    File dir = new File(dirname);
    File filen = new File("M:\Java\bin\screenshot\temp.png");
    File filename = new File(filen, ref);
    ImageIO.write(bufferedImage, "png" , filename); //writing the image to a file called filename

Answer 3

包名称与目标文件夹的名称相同。更改包名称或文件夹名称，列出的每个方法都可以正常工作

如何将文件写入 java 中的特定文件夹？

how to write a file to a particular folder in java?

java

directory

bufferedimage

file