【赛迪网-it技术报道】主要使用的是java.util.robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。

package com.qiu.util;

import java.io.*;

import java.net.*;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.image.*;

import javax.imageio.*;

import java.io.*;

/**@author qiu_baichao

*一个简单的屏幕抓图

*

**/

public class screencapture {

//test main

public static void main(string[] args) throws exception{

string userdir = system.getproperty("user.dir");

file tempfile = new file("d:","temp.png");

screencapture capture = screencapture.getinstance();

capture.captureimage();

jframe frame = new jframe();

jpanel panel = new jpanel();

panel.setlayout(new borderlayout());

jlabel imagebox = new jlabel();

panel.add(borderlayout.center,imagebox);

imagebox.seticon(capture.getpickedicon());

capture.savetofile(tempfile);

capture.captureimage();

imagebox.seticon(capture.getpickedicon());

frame.setcontentpane(panel);

frame.setsize(400,300);

frame.show();

system.out.println("over");

}

private screencapture() {

try{

robot = new robot();

}

catch(awtexception e) {

system.err.println("internal error: " + e);

e.printstacktrace();

}

jpanel cp = (jpanel)dialog.getcontentpane();

cp.setlayout(new borderlayout());

labfullscreenimage.addmouselistener(new mouseadapter() {

public void mousereleased(mouseevent evn) {

isfirstpoint = true;

pickedimage = fullscreenimage.getsubimage(recx,recy,recw,rech);

dialog.setvisible(false);

}

});

labfullscreenimage.addmousemotionlistener(new mousemotionadapter() {

public void mousedragged(mouseevent evn) {

if(isfirstpoint) {

x1 = evn.getx();

y1 = evn.gety();

isfirstpoint = false;

}

else {

x2 = evn.getx();

y2 = evn.gety();

int maxx = math.max(x1,x2);

int maxy = math.max(y1,y2);

int minx = math.min(x1,x2);

int miny = math.min(y1,y2);

recx = minx;

recy = miny;

recw = maxx-minx;

rech = maxy-miny;

labfullscreenimage.drawrectangle(recx,recy,recw,rech);

}

}

public void mousemoved(mouseevent e) {

labfullscreenimage.drawcross(e.getx(),e.gety());

}

});

cp.add(borderlayout.center,labfullscreenimage);

dialog.setcursor(cursor.getpredefinedcursor(cursor.crosshair_cursor));

dialog.setalwaysontop(true);

dialog.setmaximumsize(

toolkit.getdefaulttoolkit().getscreensize());

dialog.setundecorated(true);

dialog.setsize(dialog.getmaximumsize());

dialog.setmodal(true);

}

//singleton pattern

public static screencapture getinstance() {

return defaultcapturer;

}

/**捕捉全屏慕*/

public icon capturefullscreen() {

fullscreenimage = robot.createscreencapture(new rectangle(

toolkit.getdefaulttoolkit().getscreensize()));

imageicon icon = new imageicon(fullscreenimage);

return icon;

}

/**捕捉屏幕的一个矫形区域

*/

public void captureimage() {

fullscreenimage = robot.createscreencapture(new rectangle(

toolkit.getdefaulttoolkit().getscreensize()));

imageicon icon = new imageicon(fullscreenimage);

labfullscreenimage.seticon(icon);

dialog.setvisible(true);

}

/**得到捕捉后的bufferedimage*/

public bufferedimage getpickedimage() {

return pickedimage;

}

/**得到捕捉后的icon*/

public imageicon getpickedicon() {

return new imageicon(getpickedimage());

}

/**储存为一个文件,为png格式

*@deprecated

*replaced by saveaspng(file file)

**/

@deprecated

public void savetofile(file file) throws ioexception{

imageio.write(getpickedimage(),defaultimageformater,file);

}

/**储存为一个文件,为png格式*/

public void saveaspng(file file) throws ioexception {

imageio.write(getpickedimage(),"png",file);

}

/**储存为一个jpeg格式图像文件*/

public void saveasjpeg(file file) throws ioexception {

imageio.write(getpickedimage(),"jpeg",file);

}

/**写入一个outputstream*/

public void write(outputstream out) throws ioexception{

imageio.write(getpickedimage(),defaultimageformater,out);

}

//singleton design pattern

private static screencapture defaultcapturer = new screencapture();

private int x1,y1,x2,y2;

private int recx,recy,rech,recw; //截取的图像

private boolean isfirstpoint = true;

private backgroundimage labfullscreenimage = new backgroundimage();

private robot robot;

private bufferedimage fullscreenimage;

private bufferedimage pickedimage;

private string defaultimageformater = "png";

private jdialog dialog = new jdialog();

}

/**显示图片的label*/

class backgroundimage extends jlabel{

public void paintcomponent(graphics g) {

super.paintcomponent(g);

g.drawrect(x,y,w,h);

string area = integer.tostring(w)+" * "+ integer.tostring(h);

g.drawstring(area,x+(int)w/2-15,y+(int)h/2);

g.drawline(linex,0,linex,getheight());

g.drawline(0,liney,getwidth(),liney);

}

public void drawrectangle(int x,int y,int width,int height) {

this.x = x;

this.y = y;

h = height;

w = width;

repaint();

}

public void drawcross(int x,int y) {

linex = x;

liney = y;

repaint();

}

int linex,liney;

int x,y,h,w;

}