Java Robot（）屏幕截图

我试图在minecraft中拍摄一张截图（绑定到F2），将其转换为base64，然后将其发送到我的网站，但我的截图都没有返回图像，但尺寸在那里，下面是一个示例

任何帮助都将不胜感激，如果您需要更多信息，请告诉我

---

Vinny

使用机器人类的最佳屏幕捕获程序：

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import javax.imageio.ImageIO;

public class JavaScreenCaptureUtil {

    public static void main(String args[]) throws Exception {

        /**
         * This class (Robot.java) is used to generate native system input events for the
         * purposes of test automation, self-running demos, and other
         * applications where control of the mouse and keyboard is needed.
         * The primary purpose of Robot is to facilitate automated testing
         * of Java platform implementations.
         */
        Robot robot = new Robot();

        /**
         * Get the current screen dimensions.
         */
        Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
        int width = (int) d.getWidth();
        int height = (int) d.getHeight();

        /**
         * Delay the robot for 5 seconds (5000 ms) allowing you to switch to proper
         * screen/window whose screenshot is to be taken.
         *
         * You can change the delay time as required.
         */
        robot.delay(5000);

        /**
         * Create a screen capture of the active window and then create a buffered image
         * to be saved to disk.
         */
        Image image = robot.createScreenCapture(new Rectangle(0, 0, width,
                height));

        BufferedImage bi = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.createGraphics();
        g.drawImage(image, 0, 0, width, height, null);

        /**
         * Filename where to save the file to.
         * I am appending formatted timestamp to the filename.
         */
        String fileNameToSaveTo = "ScreenCaptured_"
                + createTimeStampStr() + ".jpg";

        /**
         * Write the captured image to a file.
         * I am using PNG format. You can choose PNG, JPG, GIF.
         */
        writeImage(bi, fileNameToSaveTo, "PNG");

        System.out.println("Screen Captured Successfully and Saved to :\n In Your Folder with Name :- "+fileNameToSaveTo);

    }

    /**
     * This method writes a buffered image to a file
     *
     * @param img -- > BufferedImage
     * @param fileLocation --> e.g. "C:/testImage.jpg"
     * @param extension --> e.g. "jpg","gif","png"
     */
    public static void writeImage(BufferedImage img, String fileLocation,
            String extension) {
        try {
            BufferedImage bi = img;
            File outputfile = new File(fileLocation);
            ImageIO.write(bi, extension, outputfile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @return String representation of timestamp
     * in the format of yyyyMMdd_hhmmss (e.g. 20100426_111612)
     * @throws Exception
     */
    public static String createTimeStampStr() throws Exception {
        Calendar mycalendar = Calendar.getInstance();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd_hhmmss");
        String timeStamp = formatter.format(mycalendar.getTime());

        return timeStamp;

    } 
}

愿这本书对你有所帮助：

---

谢谢…

我已经看过这张图片了。它的属性表示图像的大小是0px x 0px，并缩放到800px x 450px.hmm，这意味着AWT机器人没有做任何事情，因为当我拍摄屏幕截图时，游戏是800px 450px，这也解释了为什么base64数据如此短。。。我可能需要考虑如何实现minecraft的屏幕截图方法

机器人

应该可以工作。您是否尝试将其保存为文件？该文件正在正确保存，因此必须与base64编码有关，或者将其发送到我的网站。然后，这就是我正在使用的base64类。您为什么不使用

apache

commons？

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import javax.imageio.ImageIO;

public class JavaScreenCaptureUtil {

    public static void main(String args[]) throws Exception {

        /**
         * This class (Robot.java) is used to generate native system input events for the
         * purposes of test automation, self-running demos, and other
         * applications where control of the mouse and keyboard is needed.
         * The primary purpose of Robot is to facilitate automated testing
         * of Java platform implementations.
         */
        Robot robot = new Robot();

        /**
         * Get the current screen dimensions.
         */
        Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
        int width = (int) d.getWidth();
        int height = (int) d.getHeight();

        /**
         * Delay the robot for 5 seconds (5000 ms) allowing you to switch to proper
         * screen/window whose screenshot is to be taken.
         *
         * You can change the delay time as required.
         */
        robot.delay(5000);

        /**
         * Create a screen capture of the active window and then create a buffered image
         * to be saved to disk.
         */
        Image image = robot.createScreenCapture(new Rectangle(0, 0, width,
                height));

        BufferedImage bi = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.createGraphics();
        g.drawImage(image, 0, 0, width, height, null);

        /**
         * Filename where to save the file to.
         * I am appending formatted timestamp to the filename.
         */
        String fileNameToSaveTo = "ScreenCaptured_"
                + createTimeStampStr() + ".jpg";

        /**
         * Write the captured image to a file.
         * I am using PNG format. You can choose PNG, JPG, GIF.
         */
        writeImage(bi, fileNameToSaveTo, "PNG");

        System.out.println("Screen Captured Successfully and Saved to :\n In Your Folder with Name :- "+fileNameToSaveTo);

    }

    /**
     * This method writes a buffered image to a file
     *
     * @param img -- > BufferedImage
     * @param fileLocation --> e.g. "C:/testImage.jpg"
     * @param extension --> e.g. "jpg","gif","png"
     */
    public static void writeImage(BufferedImage img, String fileLocation,
            String extension) {
        try {
            BufferedImage bi = img;
            File outputfile = new File(fileLocation);
            ImageIO.write(bi, extension, outputfile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @return String representation of timestamp
     * in the format of yyyyMMdd_hhmmss (e.g. 20100426_111612)
     * @throws Exception
     */
    public static String createTimeStampStr() throws Exception {
        Calendar mycalendar = Calendar.getInstance();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd_hhmmss");
        String timeStamp = formatter.format(mycalendar.getTime());

        return timeStamp;

    } 
}