java执行groovy脚本

以下代码亲测可行：

package cn.wesure.wof.workflow;

import cn.wesure.wof.common.util.MD5Util;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import javax.script.*;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class Application {

    private final static ConcurrentHashMap<String, CompiledScript> compiledScriptMap = new ConcurrentHashMap<>();

    private static ScriptEngine engine = null;

    public static ScriptEngine getScriptEngine() {
        if (engine == null) {
            synchronized (ScriptEngine.class) {
                if (engine == null) {
                    ScriptEngineManager engineManager = new ScriptEngineManager();
                    engine = engineManager.getEngineByName("groovy");
                }
            }
        }
        return engine;
    }

    private static Object evalCacheCompilable(String expression,ScriptEngine engine) {
        try {
            String functionKey = MD5Util.md5(expression);
            final CompiledScript compiledScript = compiledScriptMap.get(functionKey);
            if (compiledScript != null) {
                //如果缓存中有，直接调用
                final Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
                return compiledScript.eval(bindings);
            }
            //如果缓存中没有，生成并且存到concurrentHashMap
            Object obj = null;
            if (compiledScript == null) {
                Compilable compilable =(Compilable)engine;
                final CompiledScript compile = compilable.compile(expression);
                compiledScriptMap.put(functionKey,compile);
                final Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
                obj = compile.eval(bindings);
            }
            return obj;
        } catch (ScriptException e) {
            System.out.println("执行groovy脚本失败");
        }
        return null;
    }

    public static void main(String[] args) {
        JSONObject jsonObject = JSON.parseObject("{\"name\": \"groot\"}");
        ScriptEngine engine = getScriptEngine();
        Bindings variables = engine.createBindings();//这里的变量可以直接在引擎中调用
        variables.put("jsonObject", jsonObject);
        engine.setBindings(variables, ScriptContext.ENGINE_SCOPE);
        Object tmp = evalCacheCompilable("return jsonObject.name", engine);//groovy返回string类型
        System.out.println(tmp);
        Object tmp2 = evalCacheCompilable("return [\"name\": \"groot\"]", engine);//groovy返回map类型
        if(tmp2 != null && tmp2 instanceof Map){
            Map map = (Map)tmp2;
            Object res = map.get("name");
            System.out.println(res);
        }
    }
}