生成“伪视频”来丰富自动测试的日志系统

    //单件模式，用来储存截图的缓冲区。    private static Vector bufferVec = null;    //标识缓冲区是否储存固定数目的截图，默认为固定数目。    private boolean isLimitedBuffer = true;    //伪视频所覆盖的自动测试过程，单位为秒；默认情况下存储最近30秒内的截图。    private int videoLength = 30;      //截图的时间间隔，单位为秒；默认情况下每隔1秒执行一次抓屏操作。    private double snapInterval = 1;      //缓冲区容量，该属性值由videoLength和snapInterval共同决定。    private int bufferCapability;    //伪视频输出位置    private String outputLocation = "c:/";    //伪视频格式，即生成的动态图片格式，在本例给出的实现使用了GIF格式。    private String pseudoVideoFormat = ".gif";    //标识生成的伪视频是否循环播放，默认为只播放一次。    private boolean replayIndefinitely = false;    //伪视频的重放速度，可选值为1，2，3。分别表示快速、中速和慢速。    private int replaySpeed = 2;    //标识是否有错误发生。当其值为true时，表明需要立即生成伪视频。    public static boolean errorFlag = false;

/** * Create a screenshot pool with limited capability, it only  * stores enough screenshots to create a pseudo-video of appointed length *  * @param videoLength - length of pseudo-video * @param snapInterval - interval to scratch screenshots, the unit is second * @param replayIndefinitely - the video plays once or repeats indefinitely * @param replaySpeed - play speed of the video,1 means fast,2 is normal,and 3 means slow */    public ScreenshotsPool(int videoLength, double snapInterval,                            boolean replayIndefinitely, int replaySpeed) {        super();        this.isLimitedBuffer = true;        this.videoLength = videoLength;        this.snapInterval = snapInterval;        this.replayIndefinitely = replayIndefinitely;        //设置有效的回放速度；        if((replaySpeed==1)||(replaySpeed==2)||(replaySpeed==3))            this.replaySpeed = replaySpeed;        //通过伪视频长度videoLength和抓屏频率snapInterval计算出缓冲区的容量        this.bufferCapability = new Double(videoLength/snapInterval).intValue();        //初始化缓冲区        getBufferVec();    }    

/** * Get buffer pool that store screenshots *  * @return Vector - the only buffer pool to store screenshots */    public Vector getBufferVec()    {        if(null==bufferVec)            bufferVec = new Vector(bufferCapability);        return bufferVec;    }

/** *  Push a new screenshot into buffer *  if the buffer is limited and has reached its capability, the oldest *  snapshot would be removed */    public void pushScreenshot()    {    //获得当前屏幕的截图对象        BufferedImage image = getCurrentScreen();        if(null==image)            return;         //如果截图缓冲区有固定容量，        if(isLimitedBuffer){            //如果已经到达缓冲区的最大容量，则删去第一副截图            int size = getBufferVec().size();            if(size==bufferCapability)                getBufferVec().remove(0);        }        //将当前截图存入缓冲区        getBufferVec().add(image);    }

/** *  Get current screenshot *  * @return BufferedImage - screenshot of current screen */    public BufferedImage getCurrentScreen()    {    try{            //获得屏幕大小            Dimension screenSize = toolkit.getDefaultToolkit().getScreenSize();            int width = screenSize.width;            int height = screenSize.height;            BufferedImage capture = null;            //获得当前屏幕范围            Rectangle area = new Rectangle(0, 0, width, height);            Robot robot = new Robot();            //截取当前屏幕范围内的内容，返回BufferedImage对象            capture = robot.createScreenCapture(area);            return capture;        }        catch (Exception e) {            e.printStackTrace();            return null;        }    }

/** * Generate pseudo-video with those buffered screens in pool *  * Here we will generate animated picture of '.gif' format, and we can * generate animated picture of other formats likewise.(SVG, PNG, etc.) */    public void generatePseudoVideo()    {        int size = this.getBufferVec().size();        if(size<1)            return;          try{ 			            BufferedImage bi = null;            //新建一个AnimatedGifEncoder对象，用来生成动态的GIF文件            AnimatedGifEncoder pseudoVideoGenerator = new AnimatedGifEncoder();             //设置GIF文件是否循环显示各帧            int repeat = replayIndefinitely?0:1;            pseudoVideoGenerator.setRepeat(repeat);             //设置输出位置，以当前时间为文件名           pseudoVideoGenerator.start(outputLocation+getCurrentTime()+pseudoVideoFormat);            //依次将缓冲区内的所有截图按指定间隔加入AnimatedGifEncoder对象            for(int i=0;i<size;i++){ 			                bi = (BufferedImage)(getBufferVec().get(i));                pseudoVideoGenerator.setDelay(200*replaySpeed);                 pseudoVideoGenerator.addFrame(bi);             }            //生成动态的GIF文件            pseudoVideoGenerator.finish(); 	                    }catch(Exception e){             e.printStackTrace();         }             }

/** * main method of this thread */    public void run()    {        while(true)         {             try             { 				                 //将当前屏幕的截图存入缓冲区                pushScreenshot();                //睡眠一段时间                Thread.sleep(new Double(1000*this.snapInterval).longValue());                //查看错误标识，一旦有错                if(errorFlag)                { 		                    //立即生成伪视频			                    generatePseudoVideo();                    //复位错误标识                    errorFlag = false; 				                }            }            catch(Exception e)             {                 e.printStackTrace();            }        }    }