ScriptEngineManager

Posted 2020-10-04 yasepix

package com.qijiabin.script;
import java.io.FileReader;
import java.util.List;
import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

/**
 * ========================================================
 * 日 期：2016年10月11日 下午5:29:19
 * 版 本：1.0.0
 * 类说明：
 * TODO
 * ========================================================
 * 修订日期     修订人    描述
 */
public class ScriptEngineManagerDemo {
    
    /**
     * 打印Script引擎
     */
    public static void printAllEngine() {
        ScriptEngineManager manager = new ScriptEngineManager();
        List<ScriptEngineFactory> factoryList = manager.getEngineFactories();
        for (ScriptEngineFactory factory : factoryList) {
            System.out.println(factory.getEngineName());
            System.out.println(factory.getEngineVersion());
            System.out.println(factory.getLanguageName());
            System.out.println(factory.getLanguageVersion());
            System.out.println(factory.getExtensions());
            System.out.println(factory.getMimeTypes());
            System.out.println(factory.getNames());
        }
    }

    /**
     * 执行javascript代码
     */
    public static void exeJSForCode() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        String script = "print (‘http://blog.163.com/nice_2012/‘)";
        try {
            engine.eval(script);
        } catch (ScriptException e) {
            e.printStackTrace();
        }
    }

    /**
     * 执行JavaScript文件代码
     */
    public static void exeJSForFile() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        try {
            FileReader reader = new FileReader("file.js");
            engine.eval(reader);
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Binding AND Exception
     */
    public static void exeJSForBinding() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        engine.put("a", 1);
        engine.put("b", 5);
        Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
        Object a = bindings.get("a");
        Object b = bindings.get("b");
        System.out.println("a = " + a);
        System.out.println("b = " + b);
        try {
            Object result = engine.eval("c = a + b;");
            System.out.println("a + b = " + result);
        } catch (ScriptException e) {
            e.printStackTrace();
        }

    }

    /**
     * Function
     */
    public static void exeJSForFunction() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        try {
            engine.eval("function add (a, b) {c = a + b; return c; }");
            Invocable jsInvoke = (Invocable) engine;
            Object result1 = jsInvoke.invokeFunction("add", new Object[] { 10, 5 });
            System.out.println(result1);
            
            Adder adder = jsInvoke.getInterface(Adder.class);
            int result2 = adder.add(10, 5);
            System.out.println(result2);
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }

    }

    /**
     * Compilable
     */
    public static void exeJSForCompilable() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        Compilable jsCompile = (Compilable) engine;
        try {
            CompiledScript script = jsCompile.compile("function hi () {print (‘hello" + "‘); }; hi ();");
            for (int i = 0; i < 5; i++) {
                script.eval();
            }
        } catch (ScriptException e) {
            e.printStackTrace();
        }
    }

    /**
     * 执行 JavaScript
     */
    public static void exeJavaScript() {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("javascript");
        try {
            Double hour = (Double) engine.eval("var date = new Date(); date.getHours();");
            String msg;
            if (hour < 10) {
                msg = "Good morning";
            } else if (hour < 16) {
                msg = "Good afternoon";
            } else if (hour < 20) {
                msg = "Good evening";
            } else {
                msg = "Good night";
            }
            System.out.println(hour);
            System.out.println(msg);
        } catch (ScriptException e) {
            System.err.println(e);
        };
    }
    
    static interface Adder {
           
        int add(int a, int b);
        
    }
    
    public static void main(String[] args) {
        printAllEngine();
        exeJSForCode();
        exeJSForFile();
        exeJSForBinding();
        exeJSForFunction();
        exeJSForCompilable();
        exeJavaScript();
    }

}