Question

java怎么调用javascript

Answer 1

可参考：
package javaIjs;

/**
* @param args
*/

import java.io.FileReader;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

/**
* Java调用并执行js文件，传递参数，并活动返回值
*
* @author manjushri
*/
public class ScriptEngineTest {

public static void main(String[] args) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("javascript");

String jsFileName = System.getProperty("user.dir")+"/src/javaIjs/expression.js";
// 读取js文件
FileReader reader = new FileReader(jsFileName);
// 执行指定脚本
System.out.println(engine.getContext().getReader());
engine.eval(reader);
if (engine instanceof Invocable) {
Invocable invoke = (Invocable) engine;
// 调用merge方法，并传入两个参数
// c = merge(2, 3);
Double c = (Double) invoke.invokeFunction("merge1", 21, 3);
System.out.println("c = " + c);
}
reader.close();
}
}