java实现区域内屏幕截图示例

这是一个java版的截图程序

package com.hongyuan.test;

import java.awt.awtexception;
import java.awt.borderlayout;
import java.awt.color;
import java.awt.dimension;
import java.awt.eventqueue;
import java.awt.flowlayout;
import java.awt.graphics;
import java.awt.image;
import java.awt.rectangle;
import java.awt.robot;
import java.awt.toolkit;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.mouseadapter;
import java.awt.event.mouseevent;
import java.awt.event.mousemotionadapter;
import java.awt.image.bufferedimage;
import java.awt.image.rescaleop;
import java.io.file;
import java.io.ioexception;
import java.text.simpledateformat;
import java.util.date;

import javax.imageio.imageio;
import javax.swing.imageicon;
import javax.swing.jbutton;
import javax.swing.jfilechooser;
import javax.swing.jtoolbar;
import javax.swing.jwindow;
import javax.swing.filechooser.filenameextensionfilter;
import javax.swing.filechooser.filesystemview;

public class screenshottest {

 public static void main(string[] args) {

  eventqueue.invokelater(new runnable() { 
   @override
   public void run() {
    try {
     screenshotwindow ssw=new screenshotwindow();
     ssw.setvisible(true);
    } catch (awtexception e) {
     e.printstacktrace();
    }
   }
  });
 }

}
/*
 * 截图窗口
 */
class screenshotwindow extends jwindow
{ 
 private int orgx, orgy, endx, endy;
    private bufferedimage image=null;
    private bufferedimage tempimage=null;
    private bufferedimage saveimage=null;

    private toolswindow tools=null;

 public screenshotwindow() throws awtexception{
   //获取屏幕尺寸
   dimension d = toolkit.getdefaulttoolkit().getscreensize();
   this.setbounds(0, 0, d.width, d.height);

   //截取屏幕
   robot robot = new robot();
   image = robot.createscreencapture(new rectangle(0, 0, d.width,d.height));

   this.addmouselistener(new mouseadapter() {
    @override
   public void mousepressed(mouseevent e) {
    //鼠标松开时记录结束点坐标，并隐藏操作窗口
             orgx = e.getx();
             orgy = e.gety();

             if(tools!=null){
              tools.setvisible(false);
             }
   }
   @override
   public void mousereleased(mouseevent e) {
    //鼠标松开时，显示操作窗口
    if(tools==null){
     tools=new toolswindow(screenshotwindow.this,e.getx(),e.gety());
    }else{
     tools.setlocation(e.getx(),e.gety());
    }
    tools.setvisible(true);
    tools.tofront();
   }
  });

   this.addmousemotionlistener(new mousemotionadapter() {

   @override
   public void mousedragged(mouseevent e) {
    //鼠标拖动时，记录坐标并重绘窗口
                endx = e.getx();
                endy = e.gety();

                //临时图像，用于缓冲屏幕区域放置屏幕闪烁
                image tempimage2=createimage(screenshotwindow.this.getwidth(),screenshotwindow.this.getheight());
                graphics g =tempimage2.getgraphics();
                g.drawimage(tempimage, 0, 0, null);
                int x = math.min(orgx, endx);
                int y = math.min(orgy, endy);
                int width = math.abs(endx - orgx)+1;
                int height = math.abs(endy - orgy)+1;
                // 加上1防止width或height0
                g.setcolor(color.blue);
                g.drawrect(x-1, y-1, width+1, height+1);
                //减1加1都了防止图片矩形框覆盖掉
                saveimage = image.getsubimage(x, y, width, height);
                g.drawimage(saveimage, x, y, null);

                screenshotwindow.this.getgraphics().drawimage(tempimage2,0,0,screenshotwindow.this);
   }
  });
 }

    @override
    public void paint(graphics g) {
        rescaleop ro = new rescaleop(0.8f, 0, null);
        tempimage = ro.filter(image, null);
        g.drawimage(tempimage, 0, 0, this);
    }
    //保存图像到文件
 public void saveimage() throws ioexception {
  jfilechooser jfc=new jfilechooser();
  jfc.setdialogtitle("保存");

  //文件过滤器，用户过滤可选择文件
  filenameextensionfilter filter = new filenameextensionfilter("jpg", "jpg");
  jfc.setfilefilter(filter);

  //初始化一个默认文件（此文件会生成到桌面上）
  simpledateformat sdf = new simpledateformat("yyyymmddhhmmss");
     string filename = sdf.format(new date());
     file filepath = filesystemview.getfilesystemview().gethomedirectory();
     file defaultfile = new file(filepath + file.separator + filename + ".jpg");
     jfc.setselectedfile(defaultfile);

  int flag = jfc.showsavedialog(this);
  if(flag==jfilechooser.approve_option){
   file file=jfc.getselectedfile();
   string path=file.getpath();
   //检查文件后缀，放置用户忘记输入后缀或者输入不正确的后缀
   if(!(path.endswith(".jpg")||path.endswith(".jpg"))){
    path+=".jpg";
   }
   //写入文件
   imageio.write(saveimage,"jpg",new file(path));
   system.exit(0);
  }
 }
}
/*
 * 操作窗口
 */
class toolswindow extends jwindow
{
 private screenshotwindow parent;

 public toolswindow(screenshotwindow parent,int x,int y) {
  this.parent=parent;
  this.init();
  this.setlocation(x, y);
  this.pack();
  this.setvisible(true);
 }

 private void init(){

  this.setlayout(new borderlayout());
  jtoolbar toolbar=new jtoolbar("java 截图");

  //保存按钮
  jbutton savebutton=new jbutton(new imageicon("images/save.gif"));
  savebutton.addactionlistener(new actionlistener() { 
   @override
   public void actionperformed(actionevent e) {
    try {
     parent.saveimage();
    } catch (ioexception e1) {
     e1.printstacktrace();
    }
   }
  });
  toolbar.add(savebutton);

  //关闭按钮
  jbutton closebutton=new jbutton(new imageicon("images/close.gif"));
  closebutton.addactionlistener(new actionlistener() {
   @override
   public void actionperformed(actionevent e) {
    system.exit(0);
   }
  });
  toolbar.add(closebutton);

  this.add(toolbar,borderlayout.north);
 }
}