从Java代码调用外部JavaScript函数

  • Z时代
  • 2024-01-10
  • 分类：问答

通过使用Java Scripting

API，我能够在Java中执行JavaScript。但是，有人可以解释一下我需要添加到此代码中以便能够调用C：/Scripts/Jsfunctions.js中的函数吗？

import javax.script.*;
public class InvokeScriptFunction {
public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");
    // JavaScript code in a String
    String script1 = (String)"function hello(name) {print ('Hello, ' + name);}";
    String script2 = (String)"function getValue(a,b) { if (a===\"Number\") return 1; 
                     else return b;}";
    // evaluate script
    engine.eval(script1);
    engine.eval(script2);
    Invocable inv = (Invocable) engine;
    inv.invokeFunction("hello", "Scripting!!" );  //This one works.      
 }
}

回答：

使用ScriptEngine.eval(java.io.Reader)读剧本

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
// read script file
engine.eval(Files.newBufferedReader(Paths.get("C:/Scripts/Jsfunctions.js"), StandardCharsets.UTF_8));
Invocable inv = (Invocable) engine;
// call function from script file
inv.invokeFunction("yourFunction", "param");

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