@Component
public class RoleDirectiveModel implements TemplateDirectiveModel {
    /**
     *
     * @param environment 环境变量
     * @param params 指令参数（存储你所需要的值，随便是什么Key-Value你懂的）
     * @param loopVars 循环变量 返回值
     * @param templateDirectiveBody 指令内容
     * 除了params外，其他的都能是Null。
     * @throws TemplateException
     * @throws IOException
     */
    @Override
    public void execute(Environment environment, Map params, TemplateModel[] loopVars, TemplateDirectiveBody templateDirectiveBody) throws TemplateException, IOException {
        System.out.println("=========");
        TemplateScalarModel user=(TemplateScalarModel)params.get("user");
        TemplateScalarModel role=(TemplateScalarModel)params.get("role");

        if("123456".equals(user.getAsString()) && "admin".equals(role.getAsString()) ){
            loopVars[0]=TemplateBooleanModel.TRUE;
        }

        List<String> otherRights=new ArrayList<>();
        otherRights.add("add");
        otherRights.add("update");
        otherRights.add("delete");
        loopVars[1]=new SimpleSequence(otherRights);

        templateDirectiveBody.render(environment.getOut());
    }
}

这是自定义指令的定义类

这是加载自定义指令的freemarker java配置类

import com.example.demo.model.tag.RoleDirectiveModel;
import com.example.demo.model.tag.SortMethod;
import freemarker.template.TemplateModelException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

@Slf4j
@Configuration
public class FreeMarkerAutoConfiguration {

    @Autowired
    private freemarker.template.Configuration configuration;
    @Autowired
    private RoleDirectiveModel roleDirectiveModel;
    @Autowired
    private SortMethod sortMethod;

    @PostConstruct
    public void setSharedVariable() {
        try {
            //自定义标签
            configuration.setSharedVariable("role", roleDirectiveModel);
            configuration.setSharedVariable("sort_int",sortMethod);
        } catch (Exception e) {
            log.error("Custom tags failed to load：{}", e.getMessage());
        }
    }
}