JDK8 dynamically define and run code in the Java Transfer JavaScript scripting engine

Import Java.lang.*;import java.util.arrays;import Java.util.list;import Javax.script.invocable;import Javax.script.scriptengine;import Javax.script.scriptenginemanager;public class Scriptenginetest {public static void    Main (string[] args) throws Exception {Scriptenginemanager sem = new Scriptenginemanager ();     ScriptEngine engine = Sem.getenginebyname ("javascript");   Python or Jython, <pre name= "code" class= "HTML" >//into the context of the variable engine.put ("msg", "Just a Test"); Defines the class user String str = "MSG + = '!!! '; var user = {name: ' Tom ', age:23,hobbies:[' football ', ' Basketball ']};   ";   Engine.eval (str);   Takes a value from the context engine String msg = (string) engine.get ("msg");   String name = (string) engine.get ("name");   string[] HB = Engine.get ("HB");   SYSTEM.OUT.PRINTLN (msg);   SYSTEM.OUT.PRINTLN (name + ":" + hb[0]); Defines the mathematical function engine.eval ("function add (A, b) {c = a + B; return C;    }");  Get the Calling interface invocable Jsinvoke = (invocable) engine; Define an addition function Object RESULT1 = jsinvoke.invokefunction ("Add", new object[] {10, 5});  System.out.println (RESULT1);  Call the addition function, pay attention to the method of Adder Adder = Jsinvoke.getinterface (Adder.class);  int result2 = Adder.add (10, 35);  System.out.println (RESULT2);  Define the Run () function Engine.eval ("function run () {print (' www.java2s.com ');}");  Invocable invokeengine = (invocable) engine;  Runnable runner = Invokeengine.getinterface (Runnable.class);  Thread t = new Thread (runner) that defines threading execution;  T.start ();  T.join ();  Import other Java packages String Jscode = "Importpackage (java.util); var list2 = arrays.aslist ([' A ', ' B ', ' C ']);  ";  Engine.eval (Jscode);  List<string> List2 = (list<string>) engine.get ("List2");  for (String val:list2) {System.out.println (val);} }}

The scripting engine provides good extensibility for implementing dynamic functions, such as plug-in mechanisms.

Documentation for the engine interface:

ScriptEngine

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JDK8 dynamically define and run code in the Java Transfer JavaScript scripting engine