Java 调用 Javascript 函数的范例

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在Java 7 以后，可以在Java代码中调用javascript中的函数，请看下面的例子：

package com.lee;import java.io.FileNotFoundException;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;import javax.script.ScriptException;/** * * @author liyanxue */public class JavaInvokeJS {    public static void main(String[] args) throws FileNotFoundException, ScriptException, NoSuchMethodException {        ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript" );        Bindings bind = engine.createBindings();        bind.put( "factor", 0);        engine.setBindings(bind, ScriptContext. ENGINE_SCOPE);        // 输入方式        /*         Scanner input = new Scanner(System.in);         while (input.hasNextInt()) {         int first = input.nextInt();         int second = input.nextInt();         System.out.println("输入的参数是：" + first + ", " + second);         engine.eval(new FileReader("/Users/ liyanxue/model.js"));         if (engine instanceof Invocable ) {         Invocable in = (Invocable ) engine;         // 执行 js函数         Double result = (Double) in.invokeFunction("formula", first, second);         System.out.println("运算结果是：" + result.intValue());         }         }         */        int first = 23;        int second = 7;        System. out.println("输入的参数是：" + first + ", " + second);        engine.eval( new FileReader("/Users/liyanxue/model.js" ));        if (engine instanceof Invocable) {            Invocable in = (Invocable) engine;            // 执行js函数            Double result = (Double) in.invokeFunction( "formula", first, second);            System. out.println("运算结果是：" + result.intValue());        }    }}

/Users/liyanxue/model.js里的代码：

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

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