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How to call methods in js in java

// js 代碼
STRING_UTIL = {};
STRING_UTIL.isNotEmpty = function (str){
    return "" != str;
}

// java 代碼
Reader scriptReaderB = new InputStreamReader(
new FileInputStream(
    new File("F:\tech-study\js-comm\release\bundle.js")),"utf-8");
      
      
      engine.eval(scriptReaderB);
      // engine.eval(scriptReaderA);
      if (engine instanceof Invocable)  
      {  
          // 調(diào)用JS方法  
          Invocable invocable = (Invocable)engine;  
          Object result = invocable.invokeFunction("STRING_UTIL.isNotEmpty", new Object[]{"hahaha"});
          
          System.out.println(result.toString());

      }
// 調(diào)用異常
java.lang.NoSuchMethodException: no such method: STRING_UTIL.isNotEmpty
    at com.sun.script.javascript.RhinoScriptEngine.invoke(RhinoScriptEngine.java:286)
    at com.sun.script.javascript.RhinoScriptEngine.invokeFunction(RhinoScriptEngine.java:258)
    at AAAAAAA.main(AAAAAAA.java:29)

// 如果在添加一個全局函數(shù)
function isNotEmpty (str){
    return STRING_UTIL.isNotEmpty(str);
}

Change the calling method to

Object result = invocable.invokeFunction("isNotEmpty", new Object[]{"hahaha"});

This is a successful operation

ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine javaScript = manager.getEngineByName("JavaScript"); InputStream stream = JS.class.getResourceAsStream("/js/test.js"); BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); javaScript.eval(reader); invocable = (Invocable) javaScript; invocable.invokeFunction("method");