Java導出印章

在做項目過程中，遇到一個需求，讓我生成一個下面格式的印章下載，我查找資料後，寫出瞭如下的代碼，生成印章。

導出的印章：

                                                       

代碼塊：

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Date;

import javax.imageio.ImageIO;

public class gz1 {

	//圖片寬度
	private static final int WIDTH = 340;
	//圖片高度
    private static final int HEIGHT = 340;

    private static String message = " 安徽省黃山市屯溪區荷花池小學";
    private static String centerName = "期末考試章";
    


    public static void main(String[] args) throws Exception{
        BufferedImage image = startGraphics2D();
        try {
        	//下載的路徑
            String filePath = "E:\\"+new Date().getTime()+".png";
            ImageIO.write(image, "png", new File(filePath)); 
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        
    }
    
    public static BufferedImage startGraphics2D(){  
        // 定義圖像buffer：高度，寬度，半透明
        BufferedImage buffImg = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);       
        //繪圖
        Graphics2D g = buffImg.createGraphics();      
        g.setColor(Color.RED);
        //線條的寬度
        g.setStroke(new BasicStroke(5));
        //設置鋸齒圓滑
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        
        //繪製圓
        //周半徑
        int radius = HEIGHT/3;
        //畫圖所出位置
        int CENTERX = WIDTH/2;
        //畫圖所處位置
        int CENTERY = HEIGHT/2;
        
        //畫圓
        Ellipse2D circle = new Ellipse2D.Double();
        circle.setFrameFromCenter(CENTERX, CENTERY, CENTERX + radius, CENTERY + radius);
        g.draw(circle);
        
        //繪製中間的五角星
        g.setFont(new Font("宋體", Font.BOLD, 80));
        g.drawString("★", CENTERX-(80/2), CENTERY+(80/3));    

        //寫入簽名
        g.setFont(new Font("宋體", Font.BOLD, 20));// 寫入簽名
        g.drawString(centerName, CENTERX -(47), CENTERY +(30+50));
        
        
        //根據輸入字符串得到字符數組
        String[] messages2 = message.split("",0);
        String[] messages = new String[messages2.length-1];
        System.arraycopy(messages2,1,messages,0,messages2.length-1);
        
        //輸入的字數
        int ilength = messages.length;
        
        //設置message字體屬性
        int fontsize = 28;
        
        Font f = new Font("Serif", Font.BOLD, fontsize);

        //正確測量文本所需的信息容器
        FontRenderContext context = g.getFontRenderContext();
        //規定的位置(X,Y)和尺寸(寬x高)定義的字體
        Rectangle2D bounds = f.getStringBounds(message, context);
        
        //字符寬度＝字符串長度/字符數
        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;
        //旋轉角度
        double a = 2*Math.asin(char_interval/(2*radius2));
        
        if (odd)
        {
            g.setFont(f);
            g.drawString(messages[first], (float)(x0 - char_interval/2), (float)y0);
            
            //中心點的右邊打印
            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);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
            }
            //中心點的左邊打印
            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);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
            }
            
        }
        else
        {
            //中心點的右邊打印
            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);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
            }
            
            //中心點的左邊打印
            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);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
            }
        }
        
        return buffImg;
    }
}