本文共 18246 字，大约阅读时间需要 60 分钟。

话不多说，直接贴代码吧。

import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Polygon;import java.awt.font.FontRenderContext;import java.awt.geom.AffineTransform;import java.awt.geom.Rectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.Calendar;import java.util.UUID;import javax.imageio.ImageIO;import org.apache.commons.lang.StringUtils;/** * 勾画圆形公司章 *  * @author ldd */public class DrawSeal {    //生成文件路径    public static final String FILE_PATH = "d:/";        private final static int WIDTH = 160;        private final static int HEIGHT = 110;        /**     * 画圆形章     * @param name1 章的名字     * @param name2 公司的名字     * @param numCode 公司的数字编码     * @param width      * @param height     * @return     */    public static String drawCircularChapter(String name1, String name2, String numCode){        OutputStream out = null;        InputStream in = null;        //创建缓存        BufferedImage bufImg = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);        //获得画布        Graphics2D gs = bufImg.createGraphics();        //设置颜色        gs.setColor(Color.WHITE);        //填充区域        gs.fillRect(0, 0, WIDTH, HEIGHT);        //设置画笔颜色        gs.setColor(new Color(204,41,41));        //画五角星        drawFiveStar(gs, WIDTH/2, (HEIGHT-10)/2, (HEIGHT-10)/6-3);        //设置画笔宽度        gs.setStroke(new BasicStroke(3));        //画圆形边框        gs.drawOval(2, 2, WIDTH-4, HEIGHT-10);        //设置字体        gs.setFont(new Font("宋体", Font.BOLD, 21));//        画数据(合同专用章)        drawCenterMessage(gs, name1, WIDTH/2+2, (HEIGHT-10) * 4 / 5);        if (StringUtils.isNotEmpty(name2) && name2.length()>11) {            int len = name2.length();            int fontSize = 18;            switch (len) {            case 12:                fontSize = 20;                break;            case 13:                fontSize = 19;                break;            case 14:                fontSize = 19;                break;            case 15:                fontSize = 18;                break;            case 16:                fontSize = 17;                break;            case 17:                fontSize = 16;                break;            case 18:                fontSize = 15;                break;            case 19:                fontSize = 14;                break;            case 20:                fontSize = 14;                break;            case 21:                fontSize = 12;                break;            case 22:                fontSize = 12;                break;            case 23:                fontSize = 10;                break;            case 24:                fontSize = 10;                break;            case 25:                fontSize = 9;                break;            default :                fontSize = 18;                break;            }            //设置字体            gs.setFont(new Font("宋体", Font.PLAIN, fontSize));        }        //画上方的环形字        drawUpperMessage(gs, name2, WIDTH/2, (HEIGHT-10)/2, WIDTH/2-8, (HEIGHT-10)/2-8);        //设置字体        gs.setFont(new Font("宋体", Font.BOLD, 9));        //画下方的环形数字        drawBelowNumber(gs, numCode, WIDTH/2, (HEIGHT-10)/2, WIDTH/2-8, (HEIGHT-10)/2+8);        //释放此图形的上下文以及它使用的所有系统资源        gs.dispose();        //输出图片        try {            StringBuffer fileDir = new StringBuffer();            fileDir.append(Calendar.getInstance().get(Calendar.YEAR)).append(File.separator).append(Calendar.getInstance().get(Calendar.MONTH)+1).append(File.separator).append(Calendar.getInstance().get(Calendar.DAY_OF_MONTH)).append(File.separator);            File ff = new File(FILE_PATH + fileDir.toString());            if (!ff.exists()) {                ff.mkdirs();            }            String imgFile = FILE_PATH + fileDir.toString() + UUID.randomUUID() + ".png";            out = new FileOutputStream(imgFile);            ImageIO.write(bufImg, "png", out);                        bufImg.flush();            out.flush();                        /*in = new FileInputStream(imgFile);            data = new byte[in.available()];            in.read(data);*/                        //对字节数组Base64编码            /*sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();            //返回Base64编码过的字节数组字符串            String encodeStr = encoder.encode(data);            //将图片文件删除            File file = new File(imgFile);            if (file.isFile()) {                file.delete();            }*/            return imgFile;        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            if (null != out) {                try {                    out.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if (null != in) {                try {                    in.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return null;    }        public static void drawCenterMessage(Graphics2D gs, String message, int CENTERX, int CENTERY){        if (message != null) {            // 根据输入字符串得到字符数组            String[] messages2 = message.split("", 0);            String[] messages = new String[messages2.length];            System.arraycopy(messages2, 0, messages, 0, messages2.length);            // 输入的字数            int ilength = messages.length;            Font f = gs.getFont();            FontRenderContext context = gs.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) - 1;                        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;            }            if (odd) {                gs.drawString(messages[first],                        (float)(CENTERX - char_interval / 2 - char_interval / 10),                         (float) CENTERY);                // 中心点的右边                for (int i = first + 1; i < ilength; i++) {                    double x = CENTERX + (i - first - 0.6) * char_interval;                    gs.drawString(messages[i],(float) x,                            (float) CENTERY);                }                // 中心点的左边                for (int i = first - 1; i > -1; i--) {                    double x = CENTERX - (first - i + 0.6) * char_interval;                    gs.drawString(messages[i],(float) x,                            (float) CENTERY);                }            } else {                // 中心点的右边                for (int i = second; i < ilength; i++) {                    double x = CENTERX + (i - second - 0.1) * char_interval;                    gs.drawString(messages[i],(float) x,                            (float) CENTERY);                }                // 中心点的左边                for (int i = first; i > -1; i--) {                    double x = CENTERX - (first + 1 - i + 0.1) * char_interval;                    gs.drawString(messages[i],(float) x,                            (float) CENTERY);                }                }        }    }        /**     * 画上方圆弧的汉字     *      * @param gs     * @param message     * @param CENTERX     * @param CENTERY     * @param r     */    public static void drawUpperMessage(Graphics2D gs, String message, int CENTERX, int CENTERY, int wr, int hr) {        if (message != null) {            // 根据输入字符串得到字符数组            String[] messages = message.split("", 0);//            String[] messages = new String[messages2.length];//            System.arraycopy(messages2, 0, messages, 0, messages2.length);            // 输入的字数            int ilength = messages.length;            Font f = gs.getFont();            FontRenderContext context = gs.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) - 1;            // 上坡度            double ascentY = - bounds.getY()-2;                        double ascentX = - bounds.getX()-2;            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 r2 = wr - ascentX;            double x0 = CENTERX;            double y0 = CENTERY - hr + ascentY;            // 旋转角度            double a = 2 * Math.asin(char_interval / (2 * r2));                if (odd) {                gs.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 = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.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 = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(-aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.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 + 0.3) * a;                    double ax = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.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 + 0.7) * a;                    double ax = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(-aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.drawString(messages[i],                        (float) (x0 - ax - char_interval / 2 * Math.cos(aa)),                        (float) (y0 + ay + char_interval / 2* Math.sin(aa)));                }            }        }    }        /**     * 画下方圆弧数字编码     *      * @param gs     * @param message     * @param CENTERX     * @param CENTERY     * @param r     */    public static void drawBelowNumber(Graphics2D gs, String message, int CENTERX, int CENTERY, int wr, int hr) {        if (message != null) {            // 根据输入字符串得到字符数组            String[] messages = message.split("", 0);//            String[] messages = new String[messages2.length];//            System.arraycopy(messages2, 0, messages, 0, messages2.length);            // 输入的字数            int ilength = messages.length;            Font f = gs.getFont();            FontRenderContext context = gs.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) + 4;            // 上坡度            double ascentY = -bounds.getY();                        double ascentX = -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 r2 = wr - ascentX;            double x0 = CENTERX;            double y0 = CENTERY - hr + ascentY;            // 旋转角度            double a = 2 * Math.asin(char_interval / (2 * r2));            if (odd) {                // 中心点的右边                for (int i = first + 1; i < ilength; i++) {                    double aa = (i - first + 0.5) * a;                    double ax = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(2*Math.PI - aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.drawString(messages[i],                        (float) (x0 + ax - char_interval / 2 * Math.cos(aa)),                        2*CENTERY - (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 = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(2*Math.PI + aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.drawString(messages[i],                        (float) (x0 - ax - char_interval / 2 * Math.cos(aa)),                        2*CENTERY - (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 + 1) * a;                    double ax = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(2*Math.PI - aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.drawString(messages[i],                        (float) (x0 + ax - char_interval / 2 * Math.cos(aa)),                        2*CENTERY - (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) * a;                    double ax = r2 * Math.sin(aa);                    double ay = r2 - r2 * Math.cos(aa);                    AffineTransform transform = AffineTransform.getRotateInstance(2*Math.PI + aa);                    Font f2 = f.deriveFont(transform);                    gs.setFont(f2);                    gs.drawString(messages[i],                        (float) (x0 - ax - char_interval / 2 * Math.cos(aa)),                        2*CENTERY - (float) (y0 + ay + char_interval / 2* Math.sin(aa)));                }            }        }    }        /**     * 画章中间的五角星     *      * @param g     * @param x     * @param y     * @param r     */    public static void drawFiveStar(Graphics g, int x, int y, int r) {        double ch=72*Math.PI/180;        int x1=x,            x2=(int)(x-Math.sin(ch)*r),            x3=(int)(x+Math.sin(ch)*r),            x4=(int)(x-Math.sin(ch/2)*r),            x5=(int)(x+Math.sin(ch/2)*r);        int y1=y-r,            y2=(int)(y-Math.cos(ch)*r),            y3=y2,            y4=(int)(y+Math.cos(ch/2)*r),            y5=y4;        int bx=(int)(x+Math.cos(ch)*Math.tan(ch/2)*r);        int by=y2;         Polygon a=new Polygon();        Polygon b=new Polygon();        a.addPoint(x2,y2);        a.addPoint(x5,y5);        a.addPoint(bx,by);        b.addPoint(x1,y1);        b.addPoint(bx,by);        b.addPoint(x3,y3);        b.addPoint(x4,y4);        g.fillPolygon(a);        g.fillPolygon(b);    }        public static void main(String[] args) {    	drawCircularChapter("国税局", "陕西XX有限公司", "A1002");	}}===========================================================  /**     * 写入到pdf 公章处     */    private void drawSeal(){        //pdf模板所在路径 (通过类名获取文件路径)        String templateFileName = DrawSeal2.class.getClassLoader().getResource("sb_loan_contract_borrow.pdf").getFile();        //使用itext的包读取pdf模板        PdfReader pdfReader = new PdfReader(templateFileName);        // 提取pdf中的表单输入域字段        AcroFields form = pdfStamper.getAcroFields();        // 通过域名获取所在页(页数)和坐标，左下角为起点        int pageNo = form.getFieldPositions("Chapter").get(0).page;        Rectangle signRect = form.getFieldPositions("Chapter").get(0).position;        //获取x y 坐标         float x = signRect.getLeft();        float y = signRect.getBottom();        //生成一个签章（用java.awt 画一个章）  章:上需要几个常量值Constants.CHAPTER_NAME, Constants.CHAPTER_COMPANY_NAME, Constants.CHAPTER_SOCIAL_NUMBER        String imgPath = DrawSeal.drawCircularChapter(Constants.CHAPTER_NAME, Constants.CHAPTER_COMPANY_NAME, Constants.CHAPTER_SOCIAL_NUMBER);        // 读图片        Image image = Image.getInstance(imgPath);        // 获取操作的页面        PdfContentByte under = pdfStamper.getOverContent(pageNo);        // 根据域的大小缩放图片        image.scaleToFit(signRect.getWidth(), signRect.getHeight());        // 添加图片        image.setAbsolutePosition(x, y);        under.addImage(image);        pdfStamper.flush();        pdfStamper.close();        pdfReader.close();    }

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