我需要在java类中使用html代码。

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

public class HtmlGenerator {
    public static void main(String[] args) throws IOException, TemplateException {
        Configuration cfg = new Configuration(Configuration.VERSION_2_3_31);
        cfg.setClassForTemplateLoading(HtmlGenerator.class, "/");
        cfg.setDefaultEncoding("UTF-8");

        Template template = cfg.getTemplate("template.ftl");

        Map<String, Object> data = new HashMap<>();
        data.put("name", "John Doe");

        StringWriter writer = new StringWriter();
        template.process(data, writer);

        String html = writer.toString();
        System.out.println(html);
    }
}