http://java.sun.com/developer/technicalArticles/J2SE/Desktop/scripting/

reference:

here is an example

            String promotion_price = null;

            String json_string="var shopVipData={\"msg\":\"\",promo:[{\"type\":\"普通会员\",\"price\":\"45.75\"},{\"type\":\"高级会员\",\"price\":\"45.71\"},{\"type\":\"VIP会员\",\"price\":\"45.34\"},{\"type\":\"至尊VIP\",\"price\":\"44.88\"}]};";

            json_string=http_response;

            logger.debug(json_string);

            String js_string="var price;for(var i=0;i<=shopVipData.promo.length-1;i++){if(shopVipData.promo[i].type=='普通会员'){price=shopVipData.promo[i].price;}}";

            ScriptEngineManager manager = new ScriptEngineManager();

            ScriptEngine engine = manager.getEngineByName("JavaScript");

            Compilable compilable = (Compilable) engine;

            CompiledScript script = null;

            Bindings binds = engine.createBindings();

            try {

                script = compilable.compile(json_string+js_string);

                script.eval(binds);

                promotion_price=binds.get("price").toString();

                logger.debug("=-----------------------------");

               

            } catch (ScriptException e) {

                e.printStackTrace();

            }