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.*;
/**
* @Description: 企业签章业务
* @Package: com.resrun.service.image
* @ClassName: EntSealGenerateService
* @copyright 北京资源律动科技有限公司
*/
@Service
public class EntSealGenerateService {
/**
* @Description #生成企业签章
* @Param [topText, middleText]
* @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
* 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
* 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) {
}
}
}
}