企业公章图片在电子签章业务中应用广泛，在电子签章应用过程中首先需要生成公章图片，然后再使用公章图片结合数字签名技术完成电子签，这样就实现了从可视化到不可篡改的数字化电子签章功能，以下是企业公章图片生成源代码。
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import com.resrun.utils.Base64;
import org.apache.pdfbox.io.IOUtils;
import org.springframework.stereotype.Service;
import javax.imageio.ImageIO;
import java.awt.;
import java.awt.image.BufferedImage;
import java.io.;
/**
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@Description: 企业签章业务
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@Package: com.resrun.service.image
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@ClassName: EntSealGenerateService
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@copyright 北京资源律动科技有限公司
*/
@Service
public class EntSealGenerateService {/**
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@Description #生成企业签章
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@Param [topText, middleText]
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@return byte[]
**/
public byte[] generateEntSeal(String topText,String middleText){byte[] bytes = export2pic("png", middleText,topText);
return bytes;
}
/**
- 印章名称距中心点偏移量,按照y轴方向
/
private int nameOffset = 50;
/* - 印章宽度
/
private int width = 200;
/* - 印章高度
/
private int height = 200;
/* - 印章中心标志(默认为五角星)外接圆半径
/
private float radius = 30;
/* - 印章名称颜色
/
private Color nameColor = Color.RED;
/* - 印章所属单位
/
// private String firm;
/* - 印章所属单位颜色
/
private Color firmColor = Color.RED;
private float firmScale = 0.7F;
/* - 边框线宽
/
private float borderWidth = 5F;
/* - 边框颜色
/
private Color borderColor = Color.RED;
/* - 印章标记(默认为五角星)线宽
/
private float signBorderWidth = 3F;
/* - 印章标记颜色
/
private Color signBorderColor = Color.RED;
/* - 印章标记填充颜色
*/
private Color signFillColor = Color.RED;
public void draw(Graphics2D g2d,String middleText,String topText) {
// 把绘制起点挪到圆中心点
g2d.translate(width / 2, height / 2);Stroke stroke = g2d.getStroke();// 旧的线性 // 填充五角星 Polygon polygon = getPentaclePoints(radius); if (signFillColor != null) { g2d.setColor(signFillColor); g2d.fill(polygon); } // 绘制五角星边框 g2d.setStroke(new BasicStroke(signBorderWidth)); g2d.setColor(signBorderColor); g2d.draw(polygon); // 绘制印章边框 g2d.setFont(nameFont); g2d.setColor(borderColor); g2d.setStroke(new BasicStroke(borderWidth)); g2d.drawOval(-width / 2, -height / 2, width, height); g2d.setStroke(stroke); // 绘制印章名称 g2d.setFont(nameFont); g2d.setColor(nameColor); //g2d.setStroke(new BasicStroke(10F)); FontMetrics fm = g2d.getFontMetrics(); int w = fm.stringWidth(middleText);// 名称宽度 int h = fm.getHeight();// 名称高度 int y = fm.getAscent() - h / 2;// 求得中心线经过字体的高度的一半时的字体的起绘点 g2d.drawString(middleText, -w / 2, y + nameOffset); // 绘制印章单位 g2d.setFont(getFirmFont(topText)); g2d.setColor(firmColor); fm = g2d.getFontMetrics(); h = fm.getHeight();// 字高度 int count = topText.length();// 字数 int r = width / 2;// 半径,就假设此印章是个矩形,方便计算 float angle; float start; if(count>1 && count <=10){ angle = 20f;// 字间角度 start = 90+(360 - angle*(count-1))/2;// 以x轴正向为0,顺时针旋转 }else if(count > 10){ angle = (360 - firmAngle) / (count-1);// 字间角度 start = 90+(360 - angle*(count-1))/2;// 以x轴正向为0,顺时针旋转 }else{ angle = 0f;// 字间角度 start = 90+(360 - angle*(2-1))/2;// 以x轴正向为0,顺时针旋转 } double vr = Math.toRadians(90);// 垂直旋转弧度 char[] chars = topText.toCharArray(); for (int i = 0; i < count; i++) { char c = chars[i];// 需要绘制的字符 int cw = fm.charWidth(c);// 此字符宽度 float a = start + angle * i;// 现在角度 double radians = Math.toRadians(a); g2d.rotate(radians);// 旋转坐标系,让要绘制的字符处于x正轴 float x = r - h;// 绘制字符的x坐标为半径减去字高度 g2d.translate(x, 0);// 移动到此位置,此时字和x轴垂直 g2d.rotate(vr);// 旋转90度,让字平行于x轴 g2d.scale(firmScale, 1);// 缩放字体宽度 g2d.drawString(String.valueOf(c), -cw / 2, 0);// 此点为字的中心点 // 将所有设置还原,等待绘制下一个 g2d.scale(1 / firmScale, 1); g2d.rotate(-vr); g2d.translate(-x, 0); g2d.rotate(-radians); } g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);}
/**
- 获取具有指定半径外接圆的五角星顶点
- @param radius
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圆半径
*/
private Polygon getPentaclePoints(float radius) {
if (radius <= 0)
return null;
float lradius = radius * 0.381966f;// 根据radius求内圆半径
double halfpi = Math.PI / 180f;
Point[] points = new Point[10];
for (int i = 0; i < points.length; i++) {
if (i % 2 == 1)
points[i] = new Point(
(int) (Math.sin(halfpi * 36 * i) * radius),
(int) (Math.cos(halfpi * 36 * i) * radius));
else
points[i] = new Point(
(int) (Math.sin(halfpi * 36 * i) * lradius),
(int) (Math.cos(halfpi * 36 * i) * lradius));
}
Polygon polygon = new Polygon();
for (Point p : points) {
polygon.addPoint(p.x, p.y);
}
return polygon;
}public int getWidth() {
return width;
}public int getHeight() {
return height;
}private Font nameFont = new Font("宋体", Font.PLAIN, 19);
private Font getFirmFont(String topText){
Font font = null;
int len = topText.length();
System.out.println(len);
if(len==1){
setFirmAngle(355);
font = new Font("宋体", Font.PLAIN, 25);
}else if(len>1 && len<=3){
setFirmAngle(310);
font = new Font("宋体", Font.PLAIN, 25);
}else if(len>3 && len<=6){
setFirmAngle(250);
font = new Font("宋体", Font.PLAIN, 25);
}else if(len>6 && len <=10){
setFirmAngle(200);
font = new Font("宋体", Font.PLAIN, 25);
}else if(len>10 && len<=13){
setFirmAngle(180);
font = new Font("宋体", Font.PLAIN, 25);
}
else if(len>13 && len<=20){
font = new Font("宋体", Font.PLAIN, 25);
setFirmAngle(120);
}else if(len>20 && len <= 25){
font = new Font("宋体", Font.PLAIN, 23);setFirmAngle(80); }else if(len>25 && len < 30){ setFirmAngle(80); font = new Font("宋体", Font.PLAIN, 19); }else if(len>=30 && len <= 40){ setFirmAngle(80); font = new Font("宋体", Font.PLAIN, 19); }else{ setFirmAngle(10); font = new Font("宋体", Font.PLAIN, 17); } return font;}
private int firmAngle;
public void setFirmAngle(int firmAngle){
this.firmAngle = firmAngle;
}/**
- 导出此印章为透明背景的图片字节数组.
- @param format
-
图片类型,如果为null,则默认为png - @return 数组
- @throws FileNotFoundException
- @throws IOException
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写出图像数据出现问题
*/
public byte[] export2pic(String format,String middleText,String topText) {
int fix = 5;// 宽高修正,如果宽高就为图片宽高,可能边框线被切割
BufferedImage bi = new BufferedImage(getWidth() + fix * 2, getHeight()
+ fix * 2, 3);Graphics2D g2d = bi.createGraphics(); //防锯齿状毛刺算法 g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.translate(fix, fix); draw(g2d,middleText,topText); ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { ImageIO.write(bi, format == null ? "png" : format, baos); return baos.toByteArray(); } catch (IOException e) { throw new RuntimeException(topText+"：生成企业签章失败",e); }finally { try { if(baos!=null) baos.close(); } catch (IOException e) { } }}
} -
`