用Java实现支持圆形带五角星 方形电子印章

jopen 10年前

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;    }

--------------------------------效果--------------------------------用Java实现支持圆形带五角星 方形电子印章