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java 怎么實(shí)現(xiàn)網(wǎng)頁(yè)截圖
代碼如下
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[java]
span style="font-size:18px;"package com.util;
import java.awt.AWTException;
import java.awt.Desktop;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import javax.imageio.ImageIO;
public class CutPicture {
public static void main(String[] args) throws Exception,
IOException, URISyntaxException, AWTException {
// 此方法僅適用于JdK1.6及以上版本
Desktop.getDesktop().browse(new URL("").toURI());
Robot robot = new Robot();
robot.delay(10000);
Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
int width = (int) d.getWidth();
int height = (int) d.getHeight();
// 最大化瀏覽器
robot.keyRelease(KeyEvent.VK_F11);
robot.delay(2000);
Image image = robot.createScreenCapture(new Rectangle(0, 0, width,height));
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = bi.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
// 保存圖片
ImageIO.write(bi, "jpg", new File("c:/open.jpg"));
}
}/span
JAVA 截屏函數(shù)
有啊 核心提示：函數(shù)需要 uses Direct3D9,D3DX9; 偶然發(fā)現(xiàn)一個(gè)函數(shù)可以直接保存表面到文件1！所以修改了一下，函數(shù)為：...
procedure CaptureScreen(Const FileName: string);
var
BitsPerPixel: Byte;
pD3D: IDirect3D9;
pSurface: IDirect3DSurface9;
g_pD3DDevice: IDirect3DDevice9;
D3DPP: TD3DPresentParameters;
ARect: TRect;
LockedRect: TD3DLockedRect;
BMP: TBitmap;
i, p: Integer;
begin
BitsPerPixel := GetDeviceCaps(Canvas.Handle, BITSPIXEL);
FillChar(d3dpp, SizeOf(d3dpp), 0);
D3DPP.Windowed := True;
D3DPP.Flags := D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
D3DPP.SwapEffect := D3DSWAPEFFECT_DISCARD;
D3DPP.BackBufferWidth := Screen.Width;
D3DPP.BackBufferHeight := Screen.Height;
D3DPP.BackBufferFormat := D3DFMT_X8R8G8B8;
pD3D := Direct3DCreate9(D3D_SDK_VERSION);
pD3D.CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, GetDesktopWindow,
D3DCREATE_SOFTWARE_VERTEXPROCESSING, @D3DPP, g_pD3DDevice);
g_pD3DDevice.CreateOffscreenPlainSurface(Screen.Width, Screen.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, pSurface, nil);
g_pD3DDevice.GetFrontBufferData(0, pSurface);
// use D3D to save surface. Notes: D3DX%ab.dll is required!
// D3DXSaveSurfaceToFile('Desktop.bmp', D3DXIFF_BMP, pSurface, nil, nil);
// use Bitmap to save surface
ARect := Screen.DesktopRect;
pSurface.LockRect(LockedRect, @ARect, D3DLOCK_NO_DIRTY_UPDATE or D3DLOCK_NOSYSLOCK or D3DLOCK_READONLY);
BMP := TBitmap.Create;
BMP.Width := Screen.Width;
BMP.Height := Screen.Height;
case BitsPerPixel of
8: BMP.PixelFormat := pf8bit;
16: BMP.PixelFormat := pf16bit;
24: BMP.PixelFormat := pf24bit;
32: BMP.PixelFormat := pf32bit;
end;
p := Cardinal(LockedRect.pBits);
for i := 0 to Screen.Height - 1 do
begin
CopyMemory(BMP.ScanLine[i], Ptr(p), Screen.Width * BitsPerPixel div 8);
p := p + LockedRect.Pitch;
end;
BMP.SaveToFile(FileName);
BMP.Free;
pSurface.UnlockRect;
end;
procedure CaptureScreen(const FileName: string;Const FileType: TD3DXImageFileFormat);
var
pD3D: IDirect3D9;
pSurface: IDirect3DSurface9;
g_pD3DDevice: IDirect3DDevice9;
D3DPP: TD3DPresentParameters;
begin
FillChar(d3dpp, SizeOf(d3dpp), 0);
D3DPP.Windowed := True;
D3DPP.Flags := D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
D3DPP.SwapEffect := D3DSWAPEFFECT_DISCARD;
D3DPP.BackBufferWidth := Screen.Width;
D3DPP.BackBufferHeight := Screen.Height;
D3DPP.BackBufferFormat := D3DFMT_X8R8G8B8;
pD3D := Direct3DCreate9(D3D_SDK_VERSION);
pD3D.CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, GetDesktopWindow,
D3DCREATE_SOFTWARE_VERTEXPROCESSING, @D3DPP, g_pD3DDevice);
g_pD3DDevice.CreateOffscreenPlainSurface(Screen.Width, Screen.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, pSurface, nil);
g_pD3DDevice.GetFrontBufferData(0, pSurface);
D3DX9.D3DXSaveSurfaceToFile(PChar(FileName),FileType,pSurface,nil,nil);
pSurface := nil;
g_pD3DDevice := nil;
pD3D := nil;
end;
傳遞兩個(gè)參數(shù)，第一個(gè)參數(shù)指定為文件名，第二個(gè)參數(shù)指定為文件類型
支持7種類型
_D3DXIMAGE_FILEFORMAT = (
D3DXIFF_BMP {= 0},
D3DXIFF_JPG {= 1},
D3DXIFF_TGA {= 2},
D3DXIFF_PNG {= 3},
D3DXIFF_DDS {= 4},
D3DXIFF_PPM {= 5},
D3DXIFF_DIB {= 6}
);
再給一個(gè)使用dX8實(shí)現(xiàn)的，上面給的是用Dx9實(shí)現(xiàn)的函數(shù)
procedure CaptureScreen(const FileName: string;Const FileType: TD3DXImageFileFormat);
var
pD3D: IDirect3D8;
pSurface: IDirect3DSurface8;
g_pD3DDevice: IDirect3DDevice8;
D3DPP: TD3DPresentParameters;
begin
FillChar(d3dpp, SizeOf(d3dpp), 0);
D3DPP.Windowed := True;
D3DPP.Flags := D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
D3DPP.SwapEffect := D3DSWAPEFFECT_DISCARD;
D3DPP.BackBufferWidth := Screen.Width;
D3DPP.BackBufferHeight := Screen.Height;
D3DPP.BackBufferFormat := D3DFMT_X8R8G8B8;
pD3D := Direct3DCreate8(D3D_SDK_VERSION);
pD3D.CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, GetDesktopWindow,
D3DCREATE_SOFTWARE_VERTEXPROCESSING, D3DPP, g_pD3DDevice);
g_pD3DDevice.CreateImageSurface(Screen.Width, Screen.Height, D3DFMT_A8R8G8B8, pSurface);
g_pD3DDevice.GetFrontBuffer(pSurface);
D3DX8.D3DXSaveSurfaceToFile(PChar(FileName),FileType,pSurface,nil,nil);
pSurface := nil;
g_pD3DDevice := nil;
pD3D := nil;
end;
再給一個(gè)直接使用系統(tǒng)GDI實(shí)現(xiàn)的抓屏
procedure CaptureScreen(const FileName: string);overload;
var
nScreenWidth,nScreenHeight: integer;
ScreenDc,hCaptureDC: HDC;
bmp: TBitmap;
begin
nScreenWidth := GetSystemMetrics(SM_CXSCREEN);
nScreenHeight := GetSystemMetrics(SM_CYSCREEN);
ScreenDc := GetDC(GetDesktopWindow);
hCaptureDC := CreateCompatibleDC(ScreenDc);
bmp := TBitmap.Create;
bmp.Handle :=CreateCompatibleBitmap(ScreenDc,nScreenWidth, nScreenHeight);
SelectObject(hCaptureDC,bmp.Handle);
BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,ScreenDc,0,0,SRCCOPY);
bmp.SaveToFile(fileName);
ReleaseDC(GetDesktopWindow,ScreenDc);
DeleteDC(hCaptureDC);
bmp.Free;
end;
通過(guò)上面這一步，我們可以很容易聯(lián)想到用來(lái)抓取任何一個(gè)控件的表面圖象，函數(shù)如下：
procedure CaptureControl(Control: TWinControl;const FileName: string);overload;
var
ControlWidth,ControlHeight: integer;
ControlDc,hCaptureDC: HDC;
bmp: TBitmap;
begin
ControlWidth := Control.ClientWidth;
ControlHeight := Control.ClientHeight;
ControlDc := GetDC(Control.Handle);
hCaptureDC := CreateCompatibleDC(ControlDc);
bmp := TBitmap.Create;
bmp.Handle :=CreateCompatibleBitmap(ControlDc,ControlWidth,ControlHeight);
SelectObject(hCaptureDC,bmp.Handle);
BitBlt(hCaptureDC,0,0,ControlWidth,ControlHeight,ControlDc,0,0,SRCCOPY);
bmp.SaveToFile(fileName);
ReleaseDC(GetDesktopWindow,ControlDc);
DeleteDC(hCaptureDC);
bmp.Free;
end;
java 禁止截屏鍵
在安卓ANDROID開(kāi)發(fā)中，有些內(nèi)容或文檔是為防止知識(shí)產(chǎn)權(quán)，防信息外泄，需要做一些保護(hù)措施，Android中如何禁止用戶截屏,防止截圖java代碼
在需要設(shè)置禁止截屏的Activity的onCreate()方法中調(diào)用setContentView()方法前添加一行代碼即可：
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
或：
getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
將以上代碼，加入需要保護(hù)的ACTIVE中，以上 JAVA代碼可以有效防止截圖，截屏操作行為，這是一種很好的保護(hù)策略。
如何以Java實(shí)現(xiàn)網(wǎng)頁(yè)截圖技術(shù)
事實(shí)上，如果您想以Java實(shí)現(xiàn)網(wǎng)頁(yè)截圖，也就是“輸入一段網(wǎng)址，幾秒鐘過(guò)后就能截取一張網(wǎng)頁(yè)縮略圖”的效果。那么，您至少有3種方式可以選擇。
1、最直接的方式——使用Robot
方法詳解：該方法利用Robat提供的強(qiáng)大桌面操作能力，硬性調(diào)用瀏覽器打開(kāi)指定網(wǎng)頁(yè)，并將網(wǎng)頁(yè)信息保存到本地。
優(yōu)勢(shì)：簡(jiǎn)單易用，不需要任何第三方插件。
缺點(diǎn)：不能同時(shí)處理大量數(shù)據(jù)，技術(shù)含量過(guò)低，屬于應(yīng)急型技巧。
實(shí)現(xiàn)方法：使用如下代碼即可。
[java] view plaincopy
public static void main(String[] args) throws MalformedURLException,
IOException, URISyntaxException, AWTException {
//此方法僅適用于JdK1.6及以上版本
Desktop.getDesktop().browse(
new URL("").toURI());
Robot robot = new Robot();
robot.delay(10000);
Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
int width = (int) d.getWidth();
int height = (int) d.getHeight();
//最大化瀏覽器
robot.keyRelease(KeyEvent.VK_F11);
robot.delay(2000);
Image image = robot.createScreenCapture(new Rectangle(0, 0, width,
height));
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = bi.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
//保存圖片
ImageIO.write(bi, "jpg", new File("google.jpg"));
}
2、最常規(guī)的方式——利用JNI，調(diào)用第三方C/C++組件
方法詳解：目前來(lái)講，Java領(lǐng)域?qū)τ诰W(wǎng)頁(yè)截圖組件的開(kāi)發(fā)明顯不足（商機(jī)？），當(dāng)您需要完成此種操作時(shí)，算得上碰到了Java的軟肋。但是，眾所周知Java也擁有強(qiáng)大的JNI能力，可以輕易將C/C++開(kāi)發(fā)的同類組件引為己用。不懂可以扣五七八零二四一四四
優(yōu)勢(shì)：實(shí)現(xiàn)簡(jiǎn)單，只需要封裝對(duì)應(yīng)的DLL文件，就可以讓Java實(shí)現(xiàn)同類功能。
劣勢(shì)：同其他JNI實(shí)現(xiàn)一樣，在跨平臺(tái)時(shí)存在隱患，而且您的程序?qū)⒉辉賹儆诩僇ava應(yīng)用。
java 實(shí)現(xiàn)截屏！
主要是利用java的幾個(gè)先有的函數(shù)，如Robot這個(gè)類的一個(gè)方法createScreenCapture一個(gè)獲得一個(gè)任意大小的屏幕圖像（在這里是全屏圖像），而所謂的截圖就是在這個(gè)圖像上畫出一個(gè)矩形，再利用上面的方法獲得這部分的圖像，程序中的cf.setAlwaysOnTop(true)是必需的;看起來(lái)是在屏幕上截圖，其實(shí)只是在一個(gè)在一個(gè)內(nèi)鑲有桌面背景的JFrame中截圖。不知道還有沒(méi)有其他的好方法~
附上代碼：
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.*;
public class Camera {
/**
* @param args
*/
public static void main(String[] args) {
CameraJFrame cf=new CameraJFrame();
cf.setAlwaysOnTop(true);
cf.setUndecorated(true);
cf.setVisible(true);
}
}
class CameraJFrame extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
Dimension di=Toolkit.getDefaultToolkit().getScreenSize();
public CameraJFrame()
{
setSize(di);
getContentPane().add(new CameraJPanel());
}
class CameraJPanel extends JPanel implements MouseListener,MouseMotionListener
{
/**
* flag主要是用來(lái)判別狀態(tài)。
* 文件的格式名是unname+數(shù)字編號(hào)，格式是png
*/
private static final long serialVersionUID = 1L;
BufferedImage bi,get;
int startx,starty,endx,endy;
int flag=1;
String filename="unname";
String fileformat="png";
int count=1;
public CameraJPanel()
{
try
{
Robot ro=new Robot();
bi=ro.createScreenCapture(new Rectangle(0,0,di.width,di.height));
}
catch(Exception e)
{
e.printStackTrace();
}
addMouseListener(this);
addMouseMotionListener(this);
}
public void paintComponent(Graphics g)
{
g.drawImage(bi,0,0,di.width,di.height,this);
g.setColor(Color.red);
g.drawRect(startx, starty, endx-startx, endy-starty);
}
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
if(e.getButton()==MouseEvent.BUTTON3)
{
System.exit(0);
}
else if(e.getClickCount()==2)
{
try
{
Robot ro=new Robot();
get=ro.createScreenCapture(new Rectangle(startx,starty,endx-startx,endy-starty));
String name=filename+String.valueOf(count++)+"."+fileformat;
File f=new File(name);
ImageIO.write(get, fileformat, f);
}
catch(Exception ex)
{
ex.printStackTrace();
}
flag=1; //置flag為1，以便重新開(kāi)始截圖。
startx=starty=endx=endy=0;
repaint();
}
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
if(flag==1)
{
startx=e.getX();
starty=e.getY();
}
}
public void mouseReleased(MouseEvent e) {
flag=0;
}
public void mouseDragged(MouseEvent e) {
flag=1;
endx=e.getX();
endy=e.getY();
repaint();
}
public void mouseMoved(MouseEvent e) {}
}
}
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