1. 开源项目 jlatexmath
2. 引入依赖

<dependency>
    <groupId>org.scilab.forge</groupId>
    <artifactId>jlatexmath</artifactId>
    <version>1.0.7</version>
</dependency>

3. 编码测试

package test;

import java.awt.Color;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import org.scilab.forge.jlatexmath.TeXConstants;
import org.scilab.forge.jlatexmath.TeXFormula;

public class Test {
    
    public static Image image(String latex) throws Exception {
        int style = TeXConstants.STYLE_DISPLAY; // 样式 符号以最大的尺寸呈现
        float size = 24; // 生成公式图片的字体大小
        Color fg = Color.BLACK; // 字体颜色，黑色
        Color bg = null; // 图片背景色，默认为透明北京
        return TeXFormula.createBufferedImage(latex, style, size, fg, bg); 
    }
    
    public static void main(String[] args) throws Exception {
        String latex = "\\sqrt{{\\mathrm{a}}^{2}+{\\mathrm{b}}^{2}}";
        File file = new File("d:/test.png"); // 保存到文件
        BufferedImage image = (BufferedImage)image(latex);
        ImageIO.write(image, "png", file);
    }
    
}

3. 测试结果

   
   
   test.png