import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;

/**
 * @author ycs
 */
public class ScreenCamera {
    /**
     * 桌面路径
     */
    public static final String DESKTOP_PATH =
            FileSystemView.getFileSystemView().getHomeDirectory().getAbsolutePath();
    /**
     * 文件名
     */
    public static String FILENAME = "screen";

    /**
     * 编号
     */
    public static int SERIAL_NUM = 0;

    /**
     * 图像文件的格式
     */
    public static final String FORMAT = "jpg";

    /**
     * 屏幕尺寸
     */
    public static Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();

    /**
     * 截屏
     **/
    public static void snapshot() {
        try {
            // 拷贝屏幕到缓存区
            BufferedImage screenshot = new Robot().createScreenCapture(
                    new Rectangle(0, 0, (int) dimension.getWidth(), (int) dimension.getHeight()));
            SERIAL_NUM++;
            // 生成路径 + 文件名
            String pathName = DESKTOP_PATH + "/" + FILENAME + SERIAL_NUM + "." + FORMAT;
            // 将screenshot图像写入文件
            ImageIO.write(screenshot, FORMAT, new FileOutputStream(pathName));
            System.out.println("Finish, Save File - " + pathName);
        } catch (Exception e) {
            throw new RuntimeException("截屏失败！\n" + e);
        }
    }

    /**
     * 执行程序
     */
    public static void exec() {
        try {
            Runtime.getRuntime().exec("C:\\Windows\\system32\\calc.exe");
        } catch (IOException e) {
            throw new RuntimeException("执行程序失败！\n" + e);
        }
    }

    public static void main(String[] args) throws InterruptedException {
        // 测试
        exec();
        Thread.sleep(1000);
        snapshot();
    }
}