java如何调用Groovy脚本

def cal(int a, int b){
    return a+b
}

GroovyClassLoader classLoader = new GroovyClassLoader();
        Class groovyClass = classLoader.parseClass("def cal(int a, int b){\n" +
                "    return a+b\n" +
                "}");
        try {
            Object[] param = { 8,7 };
            GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
            int result = (int)groovyObject.invokeMethod("cal",param);
            System.out.println(result);
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

def cl = this.class.classLoader  
while (cl) {  
    println cl  
    cl = cl.parent  
}  

    Bootstrap ClassLoader  
             ↑  
sun.misc.Launcher.ExtClassLoader      // 即Extension ClassLoader  
             ↑  
sun.misc.Launcher.AppClassLoader      // 即System ClassLoader  
             ↑  
org.codehaus.groovy.tools.RootLoader  // 以下为User Custom ClassLoader  
             ↑  
groovy.lang.GroovyClassLoader  
             ↑  
groovy.lang.GroovyClassLoader.InnerLoader  

private static void invoke(String scriptText, String function, Object... objects) throws Exception {
        GroovyClassLoader classLoader = new GroovyClassLoader();
        Class groovyClass = classLoader.parseClass(scriptText);
        try {
            GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
            groovyObject.invokeMethod(function,objects);
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

private static final GroovyScriptEngineFactory scriptEngineFactory = new GroovyScriptEngineFactory();
 
private static <T> T invoke(String script, String function, Object... objects) throws Exception {
    ScriptEngine scriptEngine = scriptEngineFactory.getScriptEngine();
    scriptEngine.eval(script);
    return (T) ((Invocable) scriptEngine).invokeFunction(function, objects);
}

private static GroovyShell groovyShell = new GroovyShell();

private static <T> T invoke(String scriptText, String function, Object... objects) throws Exception {
    Script script= groovyShell.parse(scriptText);
    return (T) InvokerHelper.invokeMethod(script, function, objects);
}

GroovyClassLoader classLoader = new GroovyClassLoader();
        Class groovyClass = classLoader.parseClass(scriptText);
        try {
            GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
            groovyObject.invokeMethod(function,objects);
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

    public Class parseClass(String text) throws CompilationFailedException {
        return parseClass(text, "script" + System.currentTimeMillis() +
                Math.abs(text.hashCode()) + ".groovy");
    }

    protected ClassCollector createCollector(CompilationUnit unit, SourceUnit su) {
        InnerLoader loader = AccessController.doPrivileged(new PrivilegedAction<InnerLoader>() {
            public InnerLoader run() {
                return new InnerLoader(GroovyClassLoader.this);
            }
        });
        return new ClassCollector(loader, unit, su);
    }

private static GroovyShell groovyShell = new GroovyShell();
 
private static Map<String, Script> scriptCache = new ConcurrentHashMap<>();
 
private static <T> T invoke(String scriptText, String function, Object... objects) throws Exception {
    Script script;
    String cacheKey = DigestUtils.md5Hex(scriptText);
 
 if (scriptCache.containsKey(cacheKey)) {
    script = scriptCache.get(cacheKey);
 } else {
    script = groovyShell.parse(scriptText);
    scriptCache.put(cacheKey, script);
 }
 
    return (T) InvokerHelper.invokeMethod(script, function, objects);
}