用Java实现支持圆形带五角星 方形电子印章
本来这不是一个特别难的问题 但是刚开始的时候一直就想通过纯的代码实现 而不借助于水印 花了有一天的时间 这的确不应该 但是从中我们也可以认识到 对于代码 千万不能钻牛角尖 正所谓 跳跳大道公罗马 不多说 下面写代码 给需要的朋友一些帮助
/** * 输出图片的公用方法 * * @param message * 弧度上的字 （基本都是从数据库读取） * @param centerName * 中间要显示的名字 * @param width * 中间字体的宽度 * @param height * 中间字体的高度 * @return * @throws FileNotFoundException * @throws IOException */ public static BufferedImage bufferedImageUtil(String message, String centerName, int width, int height) throws FileNotFoundException, IOException { BufferedImage image = null; if (message != null) { final int CENTERX = 90; final int CENTERY = 90; final int radius = 76; // 获取get_png文件夹 ActionContext ac = ActionContext.getContext(); ServletContext sc = (ServletContext) ac .get(ServletActionContext.SERVLET_CONTEXT); String filePath = sc.getRealPath(File.separator + "style" + File.separator + "imgs"); String path = filePath; image = ImageIO.read(new FileInputStream(path + File.separator + "newIcon.jpg")); Graphics2D g2 = image.createGraphics();// 得到图形上下文 g2.setColor(Color.RED); // 设置画笔颜色 // 设置字体 g2.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 15));// 写入签名 if (centerName != null) { g2.drawString(centerName, width, height); } // 根据输入字符串得到字符数组 String[] messages2 = message.split("", 0); String[] messages = new String[messages2.length - 1]; System.arraycopy(messages2, 1, messages, 0, messages2.length - 1); // 输入的字数 int ilength = messages.length; // 设置字体属性 int fontsize = 16; Font f = new Font("", Font.BOLD, fontsize); FontRenderContext context = g2.getFontRenderContext(); Rectangle2D bounds = f.getStringBounds(message, context); // 字符宽度＝字符串长度/字符数 double char_interval = (bounds.getWidth() / ilength); // 上坡度 double ascent = -bounds.getY(); int first = 0, second = 0; boolean odd = false; if (ilength % 2 == 1) { first = (ilength - 1) / 2; odd = true; } else { first = (ilength) / 2 - 1; second = (ilength) / 2; odd = false; } double radius2 = radius - ascent; double x0 = CENTERX; double y0 = CENTERY - radius + ascent; // 旋转角度 double a = 2 * Math.asin(char_interval / (2 * radius2)); if (odd) { g2.setFont(f); g2.drawString(messages[first], (float) (x0 - char_interval / 2), (float) y0); // 中心点的右边 for (int i = first + 1; i < ilength; i++) { double aa = (i - first) * a; double ax = radius2 * Math.sin(aa); double ay = radius2 - radius2 * Math.cos(aa); AffineTransform transform = AffineTransform .getRotateInstance(aa);// ,x0 + ax, y0 + ay); Font f2 = f.deriveFont(transform); g2.setFont(f2); g2 .drawString(messages[i], (float) (x0 + ax - char_interval / 2 * Math.cos(aa)), (float) (y0 + ay - char_interval / 2 * Math.sin(aa))); } // 中心点的左边 for (int i = first - 1; i > -1; i--) { double aa = (first - i) * a; double ax = radius2 * Math.sin(aa); double ay = radius2 - radius2 * Math.cos(aa); AffineTransform transform = AffineTransform .getRotateInstance(-aa);// ,x0 + ax, y0 + ay); Font f2 = f.deriveFont(transform); g2.setFont(f2); g2 .drawString(messages[i], (float) (x0 - ax - char_interval / 2 * Math.cos(aa)), (float) (y0 + ay + char_interval / 2 * Math.sin(aa))); } } else { // 中心点的右边 for (int i = second; i < ilength; i++) { double aa = (i - second + 0.5) * a; double ax = radius2 * Math.sin(aa); double ay = radius2 - radius2 * Math.cos(aa); AffineTransform transform = AffineTransform .getRotateInstance(aa);// ,x0 + ax, y0 + ay); Font f2 = f.deriveFont(transform); g2.setFont(f2); g2 .drawString(messages[i], (float) (x0 + ax - char_interval / 2 * Math.cos(aa)), (float) (y0 + ay - char_interval / 2 * Math.sin(aa))); } // 中心点的左边 for (int i = first; i > -1; i--) { double aa = (first - i + 0.5) * a; double ax = radius2 * Math.sin(aa); double ay = radius2 - radius2 * Math.cos(aa); AffineTransform transform = AffineTransform .getRotateInstance(-aa);// ,x0 + ax, y0 + ay); Font f2 = f.deriveFont(transform); g2.setFont(f2); g2 .drawString(messages[i], (float) (x0 - ax - char_interval / 2 * Math.cos(aa)), (float) (y0 + ay + char_interval / 2 * Math.sin(aa))); } } g2.dispose(); } return image; } ---------------------------------上述为圆形带五角星的章------------------------- /** * 方形名字章 * * @param message * 要刻的名字 * @return * @throws FileNotFoundException * @throws IOException */ public static BufferedImage getSquarePng(String message) throws FileNotFoundException, IOException { BufferedImage image = null; if (message != null) { ActionContext ac = ActionContext.getContext(); ServletContext sc = (ServletContext) ac .get(ServletActionContext.SERVLET_CONTEXT); String filePath = sc.getRealPath(File.separator + "style" + File.separator + "imgs"); String path = filePath; image = ImageIO.read(new FileInputStream(path + File.separator + "squarePng.png")); Graphics2D g2 = image.createGraphics();// 得到图形上下文 g2.setColor(Color.RED); // 设置画笔颜色 // 设置字体 g2.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 80));// 写入签名 if (message != null) { String newMessage = null; // 如果三个 则 XXX章 如果两个则 XX之章 大于3个 则 取前三 if (message.length() == 2) { newMessage = message + "之章"; } else if (message.length() == 3) { newMessage = message + "章"; } else if (message.length() > 3) { newMessage = message.substring(0, 3) + "章"; } char[] charArray = newMessage.toCharArray(); g2.drawString(new String(new char[] { charArray[0] }), 90, 70); // 写文字 g2.drawString(new String(new char[] { charArray[1] }), 90, 160); // 写文字 g2.drawString(new String(new char[] { charArray[2] }), 10, 70); // 写文字 g2.drawString(new String(new char[] { charArray[3] }), 10, 160); // 写文字 } } return image; } ---------------------------------方形章--------------------------------------- ---------------------------------调用方法------------------------------------ /** * 获取方形印章 * * @return */ public String getSquarePngByUserName() { String info = null; BufferedImage image = null; try { ActionContext ac = ActionContext.getContext(); HttpServletResponse response = (HttpServletResponse) ac .get(ServletActionContext.HTTP_RESPONSE); response.setContentType("image/JPEG"); OutputStream output = response.getOutputStream(); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output); Users user = (Users) SiteAction.getEntity("loginUser"); if (user != null) { String userName = user.getUName(); if (userName != null) { image = OutPicture.getSquarePng(userName); } } if (image != null) { encoder.encode(image); } output.flush(); output.close(); } catch (Exception e) { return ERROR; } return info; } // 工商行政管理局(圆形） ) public String noticeOfRegistrationPng() { String info = null; try { ActionContext ac = ActionContext.getContext(); HttpServletResponse response = (HttpServletResponse) ac .get(ServletActionContext.HTTP_RESPONSE); response.setContentType("image/JPEG"); OutputStream output = response.getOutputStream(); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output); BufferedImage image = OutPicture.bufferedImageUtil("工商行政管理局", null, 48, 150); if (image != null) { encoder.encode(image); } output.flush(); output.close(); } catch (Exception e) { info = Action.ERROR; } return info; }
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