Java模拟QQ桌面截图功能实现方法

本文实例讲述了java模拟qq桌面截图功能实现方法。分享给大家供大家参考。具体如下：

qq的桌面截图功能非常方便，去年曾用java模拟过一个，现整理出来。
本方法首先需要抓到屏幕的整个图象，将图象显示在一个jframe中，再将jframe全屏显示，这样就模拟出了一个桌面，java也就可以获得鼠标的作用区域从而实现桌面中的小范围截屏。

import javax.swing.*;
import java.awt.*;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.mouseadapter;
import java.awt.event.mouseevent;
import java.awt.event.mousemotionlistener;
/**
 * 用java模拟出qq桌面截图功能
 */
public class test extends jframe {
 private static final long serialversionuid = -267804510087895906l;
 private jbutton button = null;
 private jlabel imglabel = null;
 public test() {
 button = new jbutton("模拟屏幕（点右键退出）");
 button.addactionlistener(new actionlistener() {
  public void actionperformed(actionevent e) {
  try {
   new screenwindow(imglabel);
  } catch (exception e1) {
   joptionpane.showconfirmdialog(null, "出现意外错误！", "系统提示", joptionpane.default_option, joptionpane.error_message);
  }
  }
 });
 jpanel pane = new jpanel();
 pane.setbackground(color.white);
 imglabel = new jlabel();
 pane.add(imglabel);
 jscrollpane spane = new jscrollpane(pane);
 this.getcontentpane().add(button, borderlayout.north);
 this.getcontentpane().add(spane);
 this.setdefaultcloseoperation(jframe.exit_on_close);
 this.setsize(300, 200);
 this.setlocationrelativeto(null);
 this.setvisible(true);
 }
 public static void main(string[] args) {
 new test();
 }
}
class screenwindow extends jframe {
 private static final long serialversionuid = -3758062802950480258l;
 private boolean isdrag = false;
 private int x = 0;
 private int y = 0;
 private int xend = 0;
 private int yend = 0;
 public screenwindow(final jlabel imglabel) throws awtexception, interruptedexception {
 dimension screendims = toolkit.getdefaulttoolkit().getscreensize();
 jlabel label = new jlabel(new imageicon(screenimage.getscreenimage(0, 0, screendims.width, screendims.height)));
 label.setcursor(new cursor(cursor.crosshair_cursor));
 label.addmouselistener(new mouseadapter() {
  public void mouseclicked(mouseevent e) {
  if (e.getbutton() == mouseevent.button3) {
   dispose();
  }
  }
  public void mousepressed(mouseevent e) {
  x = e.getx();
  y = e.gety();
  }
  public void mousereleased(mouseevent e) {
  if (isdrag) {
   xend = e.getx();
   yend = e.gety();
   if(x > xend){
   int temp = x;
   x = xend;
   xend = temp;
   }
   if(y > yend){
   int temp = y;
   y = yend;
   yend = temp;
   }
   try {
   imglabel.seticon(new imageicon(screenimage.getscreenimage(x, y, xend - x, yend - y)));
   } catch (exception ex) {
   joptionpane.showconfirmdialog(null, "出现意外错误！", "系统提示", joptionpane.default_option, joptionpane.error_message);
   }
   dispose();
  }
  }
 });
 label.addmousemotionlistener(new mousemotionlistener() {
  public void mousedragged(mouseevent e) {
  if(!isdrag)
   isdrag = true;
  }
  public void mousemoved(mouseevent e) {
  /** 拖动过程的虚线选取框需自己实现 */
  }
 });
 this.setundecorated(true);
 this.getcontentpane().add(label);
 this.setsize(screendims.width, screendims.height);
 this.setvisible(true);
 this.setextendedstate(jframe.maximized_both);
 }
}
class screenimage {
 public static image getscreenimage(int x, int y, int w, int h) throws awtexception, interruptedexception {
 robot robot = new robot();
 image screen = robot.createscreencapture(new rectangle(x, y, w, h)).getscaledinstance(w, h, image.scale_smooth);
 mediatracker tracker = new mediatracker(new label());
 tracker.addimage(screen, 1);
 tracker.waitforid(0);
 return screen;
 }
}

希望本文所述对大家的java程序设计有所帮助。