根据昵称首字母生成头像

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** * 根据姓名创建图片 */
public class AvatarUtils {
    
    /** * @throws IOException * @throws **/
    public static void main(String[] args) throws IOException {
    
        String s = "体";
        long l1 = System.currentTimeMillis();
        generateImg(s, "C:\\Users\\starry\\Desktop", s);
        long l2 = System.currentTimeMillis();
        System.out.println(l2 - l1);

    }

    /** * 绘制字体头像 * * @param name 生成头像的用户名 * @param outputPath 图片保存的位置 * @param outputName 保存图片的文件名 * @throws IOException */
    public static void generateImg(String name, String outputPath, String outputName) throws IOException {
    
        int width = 168;
        int height = 168;
        int nameLen = name.length();
        if (nameLen > 1) {
    
            name = name.substring(0, 1);
        }

        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) bi.getGraphics();
        g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2.setBackground(new Color(76, 148, 232));
        g2.clearRect(0, 0, width, height);
        g2.setPaint(Color.WHITE);

        Font font;
        //中文
        if (isChinese(name)) {
    
            font = new Font("微软雅黑", Font.PLAIN, (int) (height * 0.5F));
            g2.setFont(font);
            g2.drawString(name, width * 0.25F, height * 0.7F);
        }
        //英文
        else {
    
            font = new Font("微软雅黑", Font.PLAIN, (int) (height * 0.55F));
            g2.setFont(font);
            g2.drawString(name.toUpperCase(), width * 0.3F, height * 0.67F);
        }

        String filename = outputPath + File.separator + outputName + ".png";
        File file = new File(filename);
        ImageIO.write(bi, "png", file);
    }

    /** * 判断字符串是否为中文 * * @param str * @return */
    public static boolean isChinese(String str) {
    
        String regEx = "[\\u4e00-\\u9fa5]+";
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(str);
        if (m.find()) {
    
            return true;
        } else {
    
            return false;
        }
    }

}

转 https://blog.csdn.net/qq_18620233/article/details/124796742