个回答

• A未来战士N

  2018-12-28 16:32:34

  @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());
          }
      }
  }

  
  

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