Here you can find the source of captureMainMonitor()
public static BufferedImage captureMainMonitor()
//package com.java2s; /*/* w w w . j ava 2 s. c o m*/ * This file is part of alta-commons. * * Copyright (c) 2012, alta189 <http://github.com/alta189/alta-commons/> * alta-commons is licensed under the GNU Lesser General Public License. * * alta-commons is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * alta-commons is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.AWTException; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Toolkit; import java.awt.image.BufferedImage; public class Main { public static BufferedImage captureMainMonitor() { Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()); try { return new Robot().createScreenCapture(screenRect); } catch (AWTException e) { e.printStackTrace(); } return null; } }