java中执行javascript案例_java 中执行javascript语句-优快云博客

本文介绍如何使用Java调用NashornJS引擎执行JavaScript代码，包括直接调用函数和执行本地js脚本文件的方法。通过示例代码展示了如何实现函数调用并传递参数。

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Nashorn js engine官方文档
https://docs.oracle.com/javase/7/docs/technotes/guides/scripting/programmer_guide/#top

java函数输出js的hello world：

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Maub {
public static void main(String args[]) throws ScriptException, NoSuchMethodException{
//引擎管理器
ScriptEngineManager m = new ScriptEngineManager();
//获取引擎
ScriptEngine engine = m.getEngineByName(“JavaScript”);
//执行javascript代码
engine.eval(“function hello(name){print('hello '+name)}”);
//Javascript实现了invocable调用接口
Invocable inv = (Invocable) engine;
//调用函数hello,传入world
inv.invokeFunction(“hello”,“world”);
}
}
调用文件里的js脚本:

import java.io.FileNotFoundException;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Maub {
public static void main(String args[]) throws ScriptException, NoSuchMethodException, FileNotFoundException{//引擎管理器
ScriptEngineManager m = new ScriptEngineManager();
//获取引擎
ScriptEngine engine = m.getEngineByName(“JavaScript”);
//执行javascript代码
engine.eval(new java.io.FileReader(“E:\Code\Java\src\getpwd.js”));

    Invocable inv = (Invocable) engine;
    String arg[] = {"MDwwDQYJKoZIhvcNAQEBBQADKwAw","fot123456"};
    //使用Invocable调用脚本函数,传入String参数
    System.out.println(inv.invokeFunction("getpwd",arg));
}

}