【java】IKExpression表达式解析器

IK Expression是一个开源的(OpenSource),可扩展的(Extensible),基于java语言开发的一个超轻量级(Super lightweight)的公式化语言解析执行工具包。

源码地址:https://github.com/deonwu/ik-expression

参考文档:链接:https://pan.baidu.com/s/1lxY3qGUqAiwsFJpEHWQQ9Q  提取码:1234

//支持运算:

//基础运算符: + - * /
//逻辑运算符:  ! && || 
//三元运算符:?
//括号优先级等

使用方法演示:

演示1:

public static void main(String[] args) {
    String expression1 = "true || false";
    String expression2 = "!true || false";
    String expression3 = "true && false";
    String expression4 = "true && (false || true)";
    System.out.println(ExpressionEvaluator.evaluate(expression1));//true
    System.out.println(ExpressionEvaluator.evaluate(expression2));//false
    System.out.println(ExpressionEvaluator.evaluate(expression3));//false
    System.out.println(ExpressionEvaluator.evaluate(expression4));//true
}

演示2:

public static void main(String[] args) {
    String expression1 = "(1>2) || false";
    String expression2 = "(1-2) > 0";
    String expression3 = "1*2 == 2";
    String expression4 = "1*2 != 2";
    System.out.println(ExpressionEvaluator.evaluate(expression1));//false
    System.out.println(ExpressionEvaluator.evaluate(expression2));//false
    System.out.println(ExpressionEvaluator.evaluate(expression3));//true
    System.out.println(ExpressionEvaluator.evaluate(expression4));//false
}

演示3:

public static void main(String[] args) {
    Boolean a = true;
    Boolean b = true;
    Boolean c = false;
    String expression = "a || (b && c)";
    //给表达式中的变量赋上下文的值
    List<Variable> variables = new ArrayList<Variable>();
    variables.add(Variable.createVariable("a", a));
    variables.add(Variable.createVariable("b", b));
    variables.add(Variable.createVariable("c", c));
    //执行表达式
    Object result = ExpressionEvaluator.evaluate(expression, variables);//true
}

 

 

 

持续更新!!!

 

posted @ 2020-09-06 10:02  夏夜凉凉  阅读(1903)  评论(0编辑  收藏  举报