Aviator

Aviator a lightweight, high performance expression evaluator for java.

Aviator compiles expression to byte code and evaluate it on the fly.

快速入门

aviator 代码地址

Jar 依赖

<dependency>
    <groupId>com.googlecode.aviator</groupId>
    <artifactId>aviator</artifactId>
    <version>3.3.0</version>
</dependency>

HelloAviator.java

import com.googlecode.aviator.AviatorEvaluator;

import java.util.HashMap;
import java.util.Map;

public class HelloAviator {

    public static void main(String[] args) {
        int[] a = {1, 2, 3, 4, 5};
        Map<String, Object> env = new HashMap<>(1);
        env.put("a", a);

        AviatorEvaluator.execute("1 + 2 + 3");
        AviatorEvaluator.execute("a[1] + 100", env);
        AviatorEvaluator.execute("'a[1]=' + a[1]", env);
        //求数组长度
        AviatorEvaluator.execute("count(a)", env);
        //求数组总和
        AviatorEvaluator.execute("reduce(a, +, 0)", env);
        //检测数组每个元素都在 0 <= e < 10 之间。
        AviatorEvaluator.execute("seq.every(a, seq.and(seq.ge(0), seq.lt(10)))", env);
    }

}

用途

java 表达式引擎。可以用来动态解析 java 脚本。