freemarker 定义字符串为模板

import freemarker.cache.StringTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.apache.commons.lang.StringEscapeUtils;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;

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

/**
 * Description : freemarker 模板工具类
 *
 */
public class TemplateUtils {

    public static String processString(String templateContent, Map root) {

        Configuration cfg = new Configuration();
        StringTemplateLoader stringLoader = new StringTemplateLoader();
        stringLoader.putTemplate("myTemplate", templateContent);

        cfg.setTemplateLoader(stringLoader);

        try {
            Template template = cfg.getTemplate("myTemplate", "utf-8");

            String content = FreeMarkerTemplateUtils.processTemplateIntoString(template, root);
            content = StringEscapeUtils.unescapeHtml(content);

            return content;

        } catch (IOException e) {
            e.printStackTrace();
        } catch (TemplateException e) {
            e.printStackTrace();
        }

        return null;
    }
}