Java与Javascript交互

最新推荐文章于 2023-04-11 01:40:29 发布

转载最新推荐文章于 2023-04-11 01:40:29 发布 · 134 阅读

1 ·

CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/propagator/blog/798474

文章标签：

#java #javascript #python #ViewUI

2019独角兽企业重金招聘Python工程师标准>>>

示例代码如下：

test.js

function sum(a, b)
{
    return a+b;
}

var LinkedList = Java.type("java.util.LinkedList");
var ArraysOfInt = Java.type("int[]");
var printer = java.lang.System.out;

var list = new LinkedList;
list.add(1);
list.add(2);
print("the list is: " + list);

var array = new ArraysOfInt(3);
printer.println("the length of array is : "+array.length);

ScopeTest.java

import java.io.FileNotFoundException;
import java.io.FileReader;

import javax.script.*;

public class ScopeTest
{
    private static final String jsFile = "./test.js";
    
    public static void main(String[] args) throws Exception
    {
	String script = "print(greeting)";
	ScriptEngineManager manager = new ScriptEngineManager();
	ScriptEngine engine = manager.getEngineByName("javascript");

	// Attribute from ScriptEngineManager
	manager.put("greeting", "Hello from ScriptEngineManager");
	engine.eval(script);

	// Attribute from ScriptEngine
	engine.put("greeting", "Hello from ScriptEngine");
	engine.eval(script);

	// Attribute from eval method
	ScriptContext context = new SimpleScriptContext();
	context.setAttribute("greeting", "Hello from eval method",
			     ScriptContext.ENGINE_SCOPE);
	engine.eval(script, context);

	executeFromFile();
    }

    private static void executeFromFile()
    {
	try {
	    ScriptEngine engine = ScriptUtil.executeScript(new FileReader(jsFile));
	    System.out.println("sum of 1 and 2 is: " + engine.eval("sum(1, 2)"));
	} catch (FileNotFoundException e) {
	    e.printStackTrace();
	} catch (ScriptException e) {
	    e.printStackTrace();
	}
    }

    private static class ScriptUtil {
	public static ScriptEngine executeScript(String function) throws ScriptException {
	    ScriptEngineManager engineManager = new ScriptEngineManager();
	    ScriptEngine engine = engineManager.getEngineByName("nashorn");
	    engine.eval(function);
	    return engine;
	}

	public static ScriptEngine executeScript(FileReader file) throws ScriptException {
	    ScriptEngineManager engineManager = new ScriptEngineManager();
	    ScriptEngine engine = engineManager.getEngineByName("nashorn");
	    engine.eval(file);
	    return engine;
	}
    }
}

转载于:https://my.oschina.net/propagator/blog/798474