Java操作JS函数

​Java操作JS函数

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">JAVA操作JS函数</span>

package com.crazy.java.test0;

import java.io.FileReader;
import java.util.Scanner;

import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
 * 运行JS脚本语言
 * @author root
 * 2014-10-08
 */
public class TestJavaScript {

	private static Scanner input;

	public static void main(String[] args) throws Exception {
		// 获得一个JavaScript 的执行引擎
		ScriptEngine engine = new ScriptEngineManager()
				.getEngineByName("javascript");
		// 建立上下文变量
		Bindings bind = engine.createBindings();
		bind.put("factor", 1);

		// 绑定上下文，作用域是当前引擎范围
		engine.setBindings(bind, ScriptContext.ENGINE_SCOPE);
		input = new Scanner(System.in);
		while (input.hasNextInt()) {
			int first = input.nextInt();
			int sec = input.nextInt();
			System.out.println("输入参数是：" + first + "," + sec);

			// 执行JS代码
			engine.eval(new FileReader("/home/znb/test/model.js"));
			// 是否可调用方法
			if (engine instanceof Invocable) {
				Invocable in = (Invocable) engine;
				// 执行JS中的函数
				Double result = (Double) in.invokeFunction("formula", first,
						sec);
				System.out.println("运算结果为：" + result.intValue());
			}
		}
	}
}

JS代码如下

function formula(var1,var2){
        return var1+var2*factor;
}

效果如图

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