java调用javascript-优快云博客

本文链接：https://blog.youkuaiyun.com/absurd1350/article/details/41143899

本文介绍了如何在Java中调用JavaScript代码，以实现跨语言交互。通过示例`a.js`中的`addFun`函数，展示了将JavaScript的计算功能整合到Java应用程序中的过程。

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一、

package ScriptEngine;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;

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

public class EngineTest {
public static void main(String[] args) throws ScriptException, FileNotFoundException, NoSuchMethodException {
	ScriptEngineManager xEngineManager=new ScriptEngineManager();
	ScriptEngine engine=xEngineManager.getEngineByName("JavaScript");
	String arg1="q";
	engine.put(arg1,1555);
	engine.eval("a=2");
	Object object=engine.eval("x=2*a-5+q");
	System.out.println(object);
	InputStreamReader isr= new InputStreamReader(new FileInputStream(new File("E:\\自学文件\\javaOb\\test\\src\\ScriptEngine\\a.js")));
	engine.eval(isr);
	Object object2=((Invocable) engine).invokeFunction("addFun", 1,2);
	System.out.println(object2);

}
}

a.js

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

二、编译

package ScriptEngine;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;

import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class EngineTest {
public static void main(String[] args) throws ScriptException, FileNotFoundException, NoSuchMethodException {
	ScriptEngineManager xEngineManager=new ScriptEngineManager();
	ScriptEngine engine=xEngineManager.getEngineByName("JavaScript");
	InputStreamReader isrt= new InputStreamReader(new FileInputStream(new File("E:\\自学文件\\javaOb\\test\\src\\ScriptEngine\\b.js")));
	
	CompiledScript script= ((Compilable)engine).compile(isrt);
	Object object3=	script.eval();
	System.out.println(object3);
	

}
}