效果展示程序运行后的截图：
先测试一下功能：
截图过程对界面的捕捉：
双击保存后的显示界面：
后续的步骤就自己去尝试吧，这里给出了简单的测试过程。
程序结构
核心代码capturescreen.java类
/** * capturescreen.java */import java.awt.*;import java.awt.datatransfer.dataflavor;import java.awt.datatransfer.transferable;import java.awt.datatransfer.unsupportedflavorexception;import java.awt.event.*;import javax.swing.*;import java.io.*;import javax.imageio.*;import java.awt.image.*;public class capturescreen extends jframe implements actionlistener { private jbutton start,cancel; private jpanel c; private bufferedimage get; private jtabbedpane jtp;//一个放置很多份图片 private int index;//一个一直会递增的索引,用于标认图片 private jradiobutton java,system;//java界面,系统界面 /** creates a new instance of capturescreen */ public capturescreen() { super("屏幕截取"); try{ uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname()); }catch(exception exe){ exe.printstacktrace(); } initwindow(); initother(); } private void initother(){ jtp=new jtabbedpane(jtabbedpane.top,jtabbedpane.scroll_tab_layout); } private void initwindow(){ start=new jbutton("开始截取"); cancel=new jbutton("退出"); start.addactionlistener(this); cancel.addactionlistener(this); jpanel buttonjp=new jpanel(); c=new jpanel(new borderlayout()); jlabel jl=new jlabel("屏幕截取", jlabel.center); jl.setfont(new font("黑体",font.bold,40)); jl.setforeground(color.red); c.add(jl,borderlayout.center); buttonjp.add(start); buttonjp.add(cancel); buttonjp.setborder(borderfactory.createtitledborder("公共操作区")); jpanel jp=new jpanel();//放置两个单选按钮的面板 jp.add(java=new jradiobutton("java界面")); jp.add(system=new jradiobutton("系统界面",true)); java.addactionlistener(this); system.addactionlistener(this); jp.setborder(borderfactory.createtitledborder("界面风格")); buttongroup bg=new buttongroup(); bg.add(java); bg.add(system); jpanel all=new jpanel(); all.add(jp); all.add(buttonjp); this.getcontentpane().add(c,borderlayout.center); this.getcontentpane().add(all,borderlayout.south); this.setsize(500,400); this.setlocationrelativeto(null); this.setvisible(true); this.setalwaysontop(true); this.setdefaultcloseoperation(jframe.exit_on_close); } private void updates(){ this.setvisible(true); if(get!=null){ //如果索引是0,则表示一张图片都没有被加入过, //则要清除当前的东西,重新把tabpane放进来 if(index==0){ c.removeall(); c.add(jtp,borderlayout.center); }else{//否则的话,直接对tabpane添加面板就可以了 //就什么都不用做了 } picpanel pic=new picpanel(get); jtp.addtab("图片"+(++index),pic); jtp.setselectedcomponent(pic); swingutilities.updatecomponenttreeui(c); // 调整lookandfeel（javax.swing） } } private void dostart(){ try{ this.setvisible(false); thread.sleep(500);//睡500毫秒是为了让主窗完全不见 robot ro=new robot(); // （通过本地操作）控制鼠标、键盘等实际输入源（java.awt） toolkit tk=toolkit.getdefaulttoolkit(); // awt组件的抽象父类（java.awt） dimension di=tk.getscreensize(); rectangle rec=new rectangle(0,0,di.width,di.height); bufferedimage bi=ro.createscreencapture(rec); jframe jf=new jframe(); temp temp=new temp(jf,bi,di.width,di.height); // 自定义的temp类的对象 jf.getcontentpane().add(temp,borderlayout.center); jf.setundecorated(true); jf.setsize(di); jf.setvisible(true); jf.setalwaysontop(true); } catch(exception exe){ exe.printstacktrace(); } } /** *公用的处理保存图片的方法 */ public void dosave(bufferedimage get){ try{ if(get==null){ joptionpane.showmessagedialog(this , "图片不能为空!!", "错误", joptionpane.error_message); return; } jfilechooser jfc=new jfilechooser("."); jfc.addchoosablefilefilter(new giffilter()); jfc.addchoosablefilefilter(new bmpfilter()); jfc.addchoosablefilefilter(new jpgfilter()); jfc.addchoosablefilefilter(new pngfilter()); int i=jfc.showsavedialog(this); if(i==jfilechooser.approve_option){ file file=jfc.getselectedfile(); string about="png"; string ext=file.tostring().tolowercase(); javax.swing.filechooser.filefilter ff=jfc.getfilefilter(); if(ff instanceof jpgfilter){ if(!ext.endswith(".jpg")){ string ns=ext+".jpg"; file=new file(ns); about="jpg"; } } else if(ff instanceof pngfilter){ if(!ext.endswith(".png")){ string ns=ext+".png"; file=new file(ns); about="png"; } }else if(ff instanceof bmpfilter){ if(!ext.endswith(".bmp")){ string ns=ext+".bmp"; file=new file(ns); about="bmp"; } }else if(ff instanceof giffilter){ if(!ext.endswith(".gif")){ string ns=ext+".gif"; file=new file(ns); about="gif"; } } if(imageio.write(get,about,file)){ joptionpane.showmessagedialog(this,"保存成功！"); } else joptionpane.showmessagedialog(this,"保存失败！"); } } catch(exception exe){ exe.printstacktrace(); } } /** *公共的处理把当前的图片加入剪帖板的方法 */ public void docopy(final bufferedimage image){ try{ if(get==null){ joptionpane.showmessagedialog(this ,"图片不能为空!!","错误",joptionpane.error_message); return; } // java.awt.datatransfer（接口） transferable trans = new transferable(){ // 内部类 public dataflavor[] gettransferdataflavors() { return new dataflavor[] { dataflavor.imageflavor }; } public boolean isdataflavorsupported(dataflavor flavor) { return dataflavor.imageflavor.equals(flavor); } public object gettransferdata(dataflavor flavor) throws unsupportedflavorexception, ioexception { if(isdataflavorsupported(flavor)) return image; throw new unsupportedflavorexception(flavor); } }; toolkit.getdefaulttoolkit().getsystemclipboard().setcontents(trans, null); joptionpane.showmessagedialog(this,"已复制到系统粘帖板!!"); }catch(exception exe){ exe.printstacktrace(); joptionpane.showmessagedialog(this ,"复制到系统粘帖板出错!!","错误",joptionpane.error_message); } } //处理关闭事件 private void doclose(component c){ jtp.remove(c); c=null; system.gc(); } public void actionperformed(actionevent ae){ object source=ae.getsource(); if(source==start){ dostart(); } else if(source==cancel){ system.exit(0); }else if(source==java){ // 金属外观 try{ uimanager.setlookandfeel(uimanager.getcrossplatformlookandfeelclassname()); swingutilities.updatecomponenttreeui(this); }catch(exception exe){ exe.printstacktrace(); } }else if(source==system){ // 本地外观 try{ uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname()); swingutilities.updatecomponenttreeui(this); }catch(exception exe){ exe.printstacktrace(); } } } //一个内部类,它表示一个面板,一个可以被放进tabpane的面板 //也有自己的一套处理保存和复制的方法 private class picpanel extends jpanel implements actionlistener{ jbutton save,copy,close;//表示保存,复制,关闭的按钮 bufferedimage get;//得到的图片 public picpanel(bufferedimage get){ super(new borderlayout()); this.get=get; initpanel(); } private void initpanel(){ save=new jbutton("保存(s)"); copy=new jbutton("复制到剪帖板(c)"); close=new jbutton("关闭(x)"); save.setmnemonic('s'); copy.setmnemonic('c'); close.setmnemonic('x'); jpanel buttonpanel=new jpanel(); buttonpanel.add(copy); buttonpanel.add(save); buttonpanel.add(close); jlabel icon=new jlabel(new imageicon(get)); this.add(new jscrollpane(icon),borderlayout.center); this.add(buttonpanel,borderlayout.south); save.addactionlistener(this); copy.addactionlistener(this); close.addactionlistener(this); } public void actionperformed(actionevent e) { object source=e.getsource(); if(source==save){ dosave(get); }else if(source==copy){ docopy(get); }else if(source==close){ get=null; doclose(this); } } } //保存bmp格式的过滤器 private class bmpfilter extends javax.swing.filechooser.filefilter{ public bmpfilter(){ } public boolean accept(file file){ if(file.tostring().tolowercase().endswith(".bmp")|| file.isdirectory()){ return true; } else return false; } public string getdescription(){ return "*.bmp(bmp图像)"; } } //保存jpg格式的过滤器 private class jpgfilter extends javax.swing.filechooser.filefilter{ public jpgfilter(){ } public boolean accept(file file){ if(file.tostring().tolowercase().endswith(".jpg")|| file.isdirectory()){ return true; } else return false; } public string getdescription(){ return "*.jpg(jpg图像)"; } } //保存gif格式的过滤器 private class giffilter extends javax.swing.filechooser.filefilter{ public giffilter(){ } public boolean accept(file file){ if(file.tostring().tolowercase().endswith(".gif")|| file.isdirectory()){ return true; } else return false; } public string getdescription(){ return "*.gif(gif图像)"; } } //保存png格式的过滤器 private class pngfilter extends javax.swing.filechooser.filefilter{ public boolean accept(file file){ if(file.tostring().tolowercase().endswith(".png")|| file.isdirectory()){ return true; } else return false; } public string getdescription(){ return "*.png(png图像)"; } } //一个临时类，用于显示当前的屏幕图像 private class temp extends jpanel implements mouselistener,mousemotionlistener{ private bufferedimage bi; private int width,height; private int startx,starty,endx,endy,tempx,tempy; private jframe jf; private rectangle select=new rectangle(0,0,0,0);//表示选中的区域 private cursor cs=new cursor(cursor.crosshair_cursor);//表示一般情况下的鼠标状态（十字线） private states current=states.default;// 表示当前的编辑状态 private rectangle[] rec;//表示八个编辑点的区域 //下面四个常量,分别表示谁是被选中的那条线上的端点 public static final int start_x=1; public static final int start_y=2; public static final int end_x=3; public static final int end_y=4; private int currentx,currenty;//当前被选中的x和y,只有这两个需要改变 private point p=new point();//当前鼠标移的地点 private boolean showtip=true;//是否显示提示.如果鼠标左键一按,则提示就不再显示了 public temp(jframe jf,bufferedimage bi,int width,int height){ this.jf=jf; this.bi=bi; this.width=width; this.height=height; this.addmouselistener(this); this.addmousemotionlistener(this); initrecs(); } private void initrecs(){ rec=new rectangle[8]; for(int i=0;i<rec.length;i++){ rec[i]=new rectangle(); } } public void paintcomponent(graphics g){ g.drawimage(bi,0,0,width,height,this); g.setcolor(color.red); g.drawline(startx,starty,endx,starty); g.drawline(startx,endy,endx,endy); g.drawline(startx,starty,startx,endy); g.drawline(endx,starty,endx,endy); int x=startx<endx?startx:endx; int y=starty<endy?starty:endy; select=new rectangle(x,y,math.abs(endx-startx),math.abs(endy-starty)); int x1=(startx+endx)/2; int y1=(starty+endy)/2; g.fillrect(x1-2,starty-2,5,5); g.fillrect(x1-2,endy-2,5,5); g.fillrect(startx-2,y1-2,5,5); g.fillrect(endx-2,y1-2,5,5); g.fillrect(startx-2,starty-2,5,5); g.fillrect(startx-2,endy-2,5,5); g.fillrect(endx-2,starty-2,5,5); g.fillrect(endx-2,endy-2,5,5); rec[0]=new rectangle(x-5,y-5,10,10); rec[1]=new rectangle(x1-5,y-5,10,10); rec[2]=new rectangle((startx>endx?startx:endx)-5,y-5,10,10); rec[3]=new rectangle((startx>endx?startx:endx)-5,y1-5,10,10); rec[4]=new rectangle((startx>endx?startx:endx)-5,(starty>endy?starty:endy)-5,10,10); rec[5]=new rectangle(x1-5,(starty>endy?starty:endy)-5,10,10); rec[6]=new rectangle(x-5,(starty>endy?starty:endy)-5,10,10); rec[7]=new rectangle(x-5,y1-5,10,10); if(showtip){ g.setcolor(color.cyan); g.fillrect(p.x,p.y,170,20); g.setcolor(color.red); g.drawrect(p.x,p.y,170,20); g.setcolor(color.black); g.drawstring("请按住鼠标左键不放选择截图区",p.x,p.y+15); } } //根据东南西北等八个方向决定选中的要修改的x和y的座标 private void initselect(states state){ switch(state){ case default: currentx=0; currenty=0; break; case east: currentx=(endx>startx?end_x:start_x); currenty=0; break; case west: currentx=(endx>startx?start_x:end_x); currenty=0; break; case north: currentx=0; currenty=(starty>endy?end_y:start_y); break; case south: currentx=0; currenty=(starty>endy?start_y:end_y); break; case north_east: currenty=(starty>endy?end_y:start_y); currentx=(endx>startx?end_x:start_x); break; case north_west: currenty=(starty>endy?end_y:start_y); currentx=(endx>startx?start_x:end_x); break; case south_east: currenty=(starty>endy?start_y:end_y); currentx=(endx>startx?end_x:start_x); break; case south_west: currenty=(starty>endy?start_y:end_y); currentx=(endx>startx?start_x:end_x); break; default: currentx=0; currenty=0; break; } } public void mousemoved(mouseevent me){ domousemoved(me); initselect(current); // current：当前状态（state） if(showtip){ p=me.getpoint(); repaint(); } } //特意定义一个方法处理鼠标移动,是为了每次都能初始化一下所要选择的区域 private void domousemoved(mouseevent me){ if(select.contains(me.getpoint())){ this.setcursor(new cursor(cursor.move_cursor)); current=states.move; } else{ states[] st=states.values(); for(int i=0;i<rec.length;i++){ if(rec[i].contains(me.getpoint())){ current=st[i]; this.setcursor(st[i].getcursor()); return; } } this.setcursor(cs); current=states.default; } } public void mouseexited(mouseevent me){ } public void mouseentered(mouseevent me){ } public void mousedragged(mouseevent me){ int x=me.getx(); int y=me.gety(); // 分别处理一系列的（光标）状态（枚举值） if(current==states.move){ startx+=(x-tempx); starty+=(y-tempy); endx+=(x-tempx); endy+=(y-tempy); tempx=x; tempy=y; }else if(current==states.east||current==states.west){ if(currentx==start_x){ startx+=(x-tempx); tempx=x; }else{ endx+=(x-tempx); tempx=x; } }else if(current==states.north||current==states.south){ if(currenty==start_y){ starty+=(y-tempy); tempy=y; }else{ endy+=(y-tempy); tempy=y; } }else if(current==states.north_east||current==states.north_east|| current==states.south_east||current==states.south_west){ if(currenty==start_y){ starty+=(y-tempy); tempy=y; }else{ endy+=(y-tempy); tempy=y; } if(currentx==start_x){ startx+=(x-tempx); tempx=x; }else{ endx+=(x-tempx); tempx=x; } }else{ startx=tempx; starty=tempy; endx=me.getx(); endy=me.gety(); } this.repaint(); } public void mousepressed(mouseevent me){ showtip=false; tempx=me.getx(); tempy=me.gety(); } public void mousereleased(mouseevent me){ if(me.ispopuptrigger()){ // 右键 if(current==states.move){ showtip=true; p=me.getpoint(); startx=0; starty=0; endx=0; endy=0; repaint(); } else{ // 普通情况 jf.dispose(); updates(); } } } public void mouseclicked(mouseevent me){ if(me.getclickcount()==2){ //rectangle rec=new rectangle(startx,starty,math.abs(endx-startx),math.abs(endy-starty)); point p=me.getpoint(); if(select.contains(p)){ if(select.x+select.width<this.getwidth()&&select.y+select.height<this.getheight()){ get=bi.getsubimage(select.x,select.y,select.width,select.height); jf.dispose(); updates(); }else{ int wid=select.width,het=select.height; if(select.x+select.width>=this.getwidth()){ wid=this.getwidth()-select.x; } if(select.y+select.height>=this.getheight()){ het=this.getheight()-select.y; } get=bi.getsubimage(select.x,select.y,wid,het); jf.dispose(); updates(); } } } } } public static void main(string args[]) { swingutilities.invokelater(new runnable(){ public void run(){ new capturescreen(); } }); }}//一些表示状态的枚举enum states{ north_west(new cursor(cursor.nw_resize_cursor)),//表示西北角 north(new cursor(cursor.n_resize_cursor)), north_east(new cursor(cursor.ne_resize_cursor)), east(new cursor(cursor.e_resize_cursor)), south_east(new cursor(cursor.se_resize_cursor)), south(new cursor(cursor.s_resize_cursor)), south_west(new cursor(cursor.sw_resize_cursor)), west(new cursor(cursor.w_resize_cursor)), move(new cursor(cursor.move_cursor)), default(new cursor(cursor.default_cursor)); private cursor cs; states(cursor cs){ this.cs=cs; } public cursor getcursor(){ return cs; }}
以上就是java实现屏幕截图工具的代码怎么写的详细内容。