Beispiel #1
0
 // 给定范围获得随机颜色
 Color getRandColor(int fc, int bc) {
   Random random = new Random();
   if (fc > 255) fc = 255;
   if (bc > 255) bc = 255;
   int r = fc + random.nextInt(bc - fc);
   int g = fc + random.nextInt(bc - fc);
   int b = fc + random.nextInt(bc - fc);
   return new Color(r, g, b);
 }
Beispiel #2
0
 public static int randomColor(Random om) {
   return pack(
       om.nextInt(256),
       om.nextInt(256),
       om.nextInt(256),
       // 255);
       // 253 + Rand.om.nextInt(3));
       // 200 + Rand.om.nextInt(53));
       randAlpha(om));
 }
Beispiel #3
0
 public static int randAlpha(Random om) {
   switch (om.nextInt(5)) {
     case 0:
       return 253;
     case 1:
       return 254;
     default:
       return 255;
   }
 }
Beispiel #4
0
  private static void bufSizeTest() throws Exception {
    int w, h, i, subsamp;
    byte[] srcBuf, jpegBuf;
    TJCompressor tjc = null;
    Random r = new Random();

    try {
      tjc = new TJCompressor();
      System.out.println("Buffer size regression test");
      for (subsamp = 0; subsamp < TJ.NUMSAMP; subsamp++) {
        for (w = 1; w < 48; w++) {
          int maxh = (w == 1) ? 2048 : 48;
          for (h = 1; h < maxh; h++) {
            if (h % 100 == 0) System.out.format("%04d x %04d\b\b\b\b\b\b\b\b\b\b\b", w, h);
            srcBuf = new byte[w * h * 4];
            jpegBuf = new byte[TJ.bufSize(w, h, subsamp)];
            for (i = 0; i < w * h * 4; i++) {
              srcBuf[i] = (byte) (r.nextInt(2) * 255);
            }
            tjc.setSourceImage(srcBuf, w, 0, h, TJ.PF_BGRX);
            tjc.setSubsamp(subsamp);
            tjc.setJPEGQuality(100);
            tjc.compress(jpegBuf, 0);

            srcBuf = new byte[h * w * 4];
            jpegBuf = new byte[TJ.bufSize(h, w, subsamp)];
            for (i = 0; i < h * w * 4; i++) {
              srcBuf[i] = (byte) (r.nextInt(2) * 255);
            }
            tjc.setSourceImage(srcBuf, h, 0, w, TJ.PF_BGRX);
            tjc.compress(jpegBuf, 0);
          }
        }
      }
      System.out.println("Done.      ");
    } catch (Exception e) {
      if (tjc != null) tjc.close();
      throw e;
    }
    if (tjc != null) tjc.close();
  }
Beispiel #5
0
 public void initRandom(int[] values) {
   Random r = new Random();
   for (int i = 0; i < getWidth(); i++) {
     set(i, 0, values[r.nextInt(values.length)]);
   }
 }
Beispiel #6
0
  public void _jspService(HttpServletRequest request, HttpServletResponse response)
      throws java.io.IOException, ServletException {

    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;

    try {
      response.setContentType("image/jpeg");
      pageContext =
          _jspxFactory.getPageContext(
              this, request, response, "/myhtml/errorpage/erroe.jsp", true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("\r\n");
      out.write('\r');
      out.write('\n');

      // 设置页面不缓存
      response.setHeader("Pragma", "No-cache");
      response.setHeader("Cache-Control", "no-cache");
      response.setDateHeader("Expires", 0);

      //   在内存中创建图象
      int width = 60, height = 20;
      BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

      //   获取图形上下文
      Graphics g = image.getGraphics();

      // 生成随机类
      Random random = new Random();

      //   设定背景色
      g.setColor(getRandColor(200, 250));
      g.fillRect(0, 0, width, height);

      // 设定字体
      g.setFont(new Font("Times   New   Roman", Font.PLAIN, 18));

      // 画边框
      // g.setColor(new   Color());
      // g.drawRect(0,0,width-1,height-1);

      //   随机产生155条干扰线,使图象中的认证码不易被其它程序探测到
      g.setColor(getRandColor(160, 200));
      for (int i = 0; i < 155; i++) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
        g.drawLine(x, y, x + xl, y + yl);
      }

      //   取随机产生的认证码(4位数字)
      String sRand = "";
      for (int i = 0; i < 4; i++) {
        String rand = String.valueOf(random.nextInt(10));
        sRand += rand;
        //   将认证码显示到图象中
        g.setColor(
            new Color(
                20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
        // 调用函数出来的颜色相同,可能是å›
        // ä¸ºç§å­å¤ªæŽ¥è¿‘,所以只能直接生成
        g.drawString(rand, 13 * i + 6, 16);
      }

      //   将认证码存入SESSION
      session.setAttribute("rand", sRand);

      //   图象生效
      g.dispose();

      //   输出图象到页面
      ImageIO.write(image, "JPEG", response.getOutputStream());
      out.clear();
      out = pageContext.pushBody();

    } catch (Throwable t) {
      if (!(t instanceof SkipPageException)) {
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            out.clearBuffer();
          } catch (java.io.IOException e) {
          }
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else log(t.getMessage(), t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }