简介
Juel是统一表达语言轻量而高效级的实现，具有高性能，插件式缓存，小体积，支持方法调用和多参数调用，可插拔多种特性。具体可以去Juel官方网站进行详细阅读。
具体实现：
一、在pom文件中引入juel依赖
<dependency><groupId>de.odysseus.juel</groupId><artifactId>juel</artifactId><version>2.1.3</version>
</dependency>
二、创建工具类
public final class ConditionElUtil {private ConditionElUtil(){}public static Boolean checkFormDataByRuleEl(String el, Map<String, Object> formData) {ExpressionFactory factory = new ExpressionFactoryImpl();SimpleContext context = new SimpleContext();for (Map.Entry<String,Object> entry : formData.entrySet()) {Object value = entry.getValue();if (value != null) {context.setVariable(entry.getKey(), factory.createValueExpression(value, value.getClass()));}}ValueExpression e = factory.createValueExpression(context, el, Boolean.class);return (Boolean) e.getValue(context);}
}
三、测试
@Test
public void checkFormDataByRuleEl() throws Exception {String el = "${请假天数>3 && 部门 == '产品部'}";Map<String, Object> formData = new HashMap<>();formData.put("请假天数", 6);formData.put("部门", "产品部");System.out.println(ConditionElUtil.checkFormDataByRuleEl(el, formData));
}