freemarker依赖

          org.freemarker
          freemarker
      

   org.springframework.boot
   spring-boot-starter-web
   
      
         ch.qos.logback
         logback-classic
      
   

   src/main/java
   
 
      **/*.ftl
   
   
   true

import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Locale;
import java.util.Map;

public class FreeMarkerUtil {

    private final static Logger logger = LoggerFactory.getLogger(FreeMarkerUtil.class);

    private static Configuration conf = null;
    static {
        conf = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
        conf.setClassForTemplateLoading(FreeMarkerUtil.class, "/com/yung/view");

        conf.setObjectWrapper(new DefaultObjectWrapper(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS));
        conf.setLocale(Locale.CHINA);
        conf.setDefaultEncoding("utf-8");
        conf.setClassicCompatible(true);
    }

    public static String getString(Map root,String tplName) {

        Writer out = new StringWriter(2048);
        try {
            Template temp = conf.getTemplate(tplName);
            temp.process(root, out);
        } catch (IOException e) {
            logger.error(e.getMessage(),e);
        } catch (TemplateException e) {
            logger.error(e.getMessage(),e);
        }
        return out.toString();
    }

}