Using Different Isolation Levels for Executing Scripts - Java Scripting

Java examples for Scripting:Run Script

  1. HOME
  2. Java
  3. Scripting
  4. Run Script

Description

Using Different Isolation Levels for Executing Scripts

Demo Code

import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.script.SimpleScriptContext;
import static javax.script.SimpleScriptContext.ENGINE_SCOPE;
import static javax.script.SimpleScriptContext.GLOBAL_SCOPE;

public class Main {
  public static void main(String[] args) throws ScriptException {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    manager.put("n1", 100);

    String script = "var sum = n1 + n2;" +
                    "print(msg + " +
                    "' n1=' + n1 + ', n2=' + n2 + " +
                    "', sum=' + sum);";

    engine.put("n2", 2);
    engine.put("msg", "Using the default context:");
    engine.eval(script);//from   w ww.j  ava 2s .  c  om

    Bindings bindings = engine.createBindings();
    bindings.put("n2", 300);
    bindings.put("msg", "Using a Bindings:");
    engine.eval(script, bindings);

    ScriptContext ctx = new SimpleScriptContext();
    Bindings ctxGlobalBindings = engine.createBindings();
    ctx.setBindings(ctxGlobalBindings, GLOBAL_SCOPE);
    ctx.setAttribute("n1", 4, GLOBAL_SCOPE);
    ctx.setAttribute("n2", 5, ENGINE_SCOPE);
    ctx.setAttribute("msg", "Using a ScriptContext:", ENGINE_SCOPE);
    engine.eval(script, ctx);

    engine.eval(script);
  }
}

Result


Related Tutorials